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Claim register

Claim Evaluation

Every claim is stated exactly, traced to its origin, and evaluated against the best supporting and the best opposing case. Scientific claims must expose their full reasoning chain — observation, measurement, calculation, prediction, physical test, result, replication — and declare per-model predictions BEFORE the result is shown. Appeals to authority (“science says”, “experts agree”, “the math proves it”, “settled”) are not evidence. Confidence is authored, not tallied. Preserve disagreement rather than force a conclusion.

Showing 23 of 23 claim records. Anyone can read this page — no account required.

  • Gleason's 1892 map is patented as a north-polar azimuthal-equidistant projection

    Supported

    US Patent 497,917 describes Gleason's map construction as an azimuthal-equidistant projection centered at the north pole.

    Origin: US Patent and Trademark Office, patent 497,917 (1893).

    Best supporting case

    The patent text itself describes the construction (equal linear scale of meridians from the pole). Modern d3-geo azimuthal-equidistant reproduces the same coastline geometry at matching scale.

    Best opposing case

    No credible opposing case on the patent's own text. Some interpret the map as a literal cosmological chart; that is a separate claim, not a patent-text claim.

    Evidence

    Circular-reasoning check

    No circular-reasoning risks identified in the authored evidence chain.

    Hidden assumptions

    • The 1892 image and the 1893 patent describe the same construction (they do; the patent post-dates print).

    Missing evidence

    • Original printing plates would strengthen provenance; none currently traced.

    Contradictions

    — none recorded —

    Reproducibility

    • Directly reproducible: render coastlines in any d3-geo build with azimuthal-equidistant centered at 90°N.

    Confidence · high

    The claim is grammatically about the patent's own words plus a geometric reproduction. Both are directly checkable; nothing is inferred about the earth itself.

    Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

    Open in evidence graph →Browse sources

  • The Gleason map's coastline geometry matches an azimuthal-equidistant projection of a spherical earth

    Supported

    The observed coastline layout on Gleason's 1892 map is consistent with — not evidence against — a north-polar azimuthal-equidistant projection of a spherical earth.

    Origin: Direct comparison in this lab's Projection view.

    Best supporting case

    Rendering Natural Earth coastlines under a modern d3-geo azimuthal-equidistant centered on 90°N produces the same continental placement Gleason shows.

    Best opposing case

    One could argue the projection is a literal chart of a flat earth. That interpretation is a separate cosmological claim not decided by the projection identity.

    Evidence

    Circular-reasoning check

    No circular-reasoning risks identified in the authored evidence chain.

    Hidden assumptions

    • The comparison assumes Natural Earth 1:110m is an accurate coastline at that scale — it is, within documented tolerances.
    • The comparison establishes projection identity only, not cosmology.

    Missing evidence

    • A pixel-accurate georeferenced overlay of the archival scan against the d3 render, with explicit control points and residuals.

    Contradictions

    — none recorded —

    Reproducibility

    • Directly reproducible in the Projection Lab.

    Confidence · moderate

    The math is straightforward, but a rigorously georeferenced overlay would move this from moderate to high.

    Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

    Open in evidence graph →Browse sources

  • The United Nations emblem depicts a north-polar azimuthal-equidistant projection

    Supported

    The map inside the UN emblem is a north-polar azimuthal-equidistant projection framed by olive branches.

    Origin: UN emblem specification, WIPO 6ter registry.

    Best supporting case

    The UN's own emblem description names the projection type. The emblem's use is heraldic — a design choice, not a cosmological claim.

    Best opposing case

    Some argue the choice of projection is evidence of an institutional cosmology. That is an inference about intent, not about the emblem's geometric identity.

    Evidence

    Circular-reasoning check

    • Treats agreement among institutions as physical evidence

    Hidden assumptions

    • That an organization's emblem reflects its factual worldview. The emblem was designed as a heraldic device.

    Missing evidence

    • Meeting minutes or design memos that would explain why the projection was chosen over alternatives.

    Contradictions

    — none recorded —

    Reproducibility

    • Directly checkable against the emblem image.

    Confidence · high

    The narrow claim (what projection the emblem depicts) is settled by the emblem's own specification. Broader claims about intent are separate.

    Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

    Open in evidence graph →Browse sources

  • Southern-hemisphere long-haul flight times distinguish between competing world models

    Plausible

    The observed scheduled block times for SYD↔SCL, JNB↔PER, and AKL↔EZE distinguish between a spherical earth and a Gleason-flat cosmology.

    Origin: Popular map-model debates; verified endpoints via OurAirports.

    Best supporting case

    Great-circle distances on a mean-radius sphere plus published block times match observed operations at ordinary jet cruise speeds.

    Best opposing case

    The observation only cuts between models after a specific competing projection's distance calculation is stated. Absent that, block times are consistent with both by assumption.

    Evidence

    Reasoning chain · observation → measurement → calculation → prediction → physical test → result → replication

    1. observation Direct observation

      Scheduled non-stop passenger service operates SYD↔SCL, JNB↔PER, AKL↔EZE.

      Performed by
      Public airline schedules; corroborated by OurAirports airport records.

    2. measurement Raw measurement

      Endpoint airport coordinates recorded in WGS84 decimal degrees.

      Equipment
      Public OurAirports dataset, WGS84 reference.
      Raw values
      SYD −33.9461, 151.1772 · SCL −33.3928, −70.7858 · JNB −26.1392, 28.2460 · PER −31.9403, 115.9669 · AKL −37.0080, 174.7920 · EZE −34.8222, −58.5358
      Error sources / limits
      Airport reference point vs. runway threshold: <2 km, negligible at 10^4 km scale.

    3. calculation Mathematical calculation

      Great-circle distance via haversine on a mean-radius sphere R = 6371.0088 km.

      Procedure
      d = 2R · asin(√(sin²(Δφ/2) + cos φ₁ cos φ₂ sin²(Δλ/2))).

      ⚠ Uses a spherical earth assumption. This is not independent evidence for a sphere; it is a prediction FROM the sphere model.

    4. prediction Mathematical calculation

      At 800–900 km/h ground speed the great-circle distance divides into a block time consistent with published schedules (~12–14 h depending on winds).

    5. physical test Direct observation

      Board the flight or track it with ADS-B; record wheels-up and touchdown timestamps; compare to schedule window.

    6. result Raw measurement

      Public schedule windows fall inside the sphere-model prediction band. A Gleason-projection distance for the same endpoints has not been supplied for direct numerical comparison in this record.

    7. replication Testimony

      Multiple carriers over multi-year windows repeat the operation. Independent ADS-B archives (e.g. FlightRadar24, ADS-B Exchange) would strengthen this — not yet ingested here.

      Independent replication
      Not yet ingested with primary URLs; treat replication as 'reported but unverified in this record'.

    Model predictions · declared before results

    Spherical earth (WGS84 mean sphere)

    Expected: SYD→SCL ≈ 11,364 km · JNB→PER ≈ 8,300 km · AKL→EZE ≈ 10,350 km

    Pattern: Curved great-circle track passing south of a straight rhumb line.

    Uncertainty: ±1% for endpoint precision; block-time band widens with wind.

    Gleason north-polar azimuthal projection

    No quantitative prediction supplied.

    No widely published distance formula treats the Gleason projection as a physical geometry with a stated metric for southern-hemisphere point pairs. Until one is supplied, mark as 'No quantitative prediction supplied' rather than inventing one.

    Outcome: Result is too uncertain to distinguish the models

    Interactive calculator · Great-circle distance SYD → SCL (haversine, sphere assumption)

    d = 2·R·asin(√(sin²(Δφ/2) + cos φ₁·cos φ₂·sin²(Δλ/2)))

    Result: error: Code generation from strings disallowed for this context km
    Expected:
    ≈ 11,364 km
    Measured:
    Not a direct measurement — the returned number is calculated FROM the sphere model.
    Uncertainty:
    ±0.5% from endpoint precision; excludes wind/track deviations.
    Alt. models:
    Any distance formula that reduces to the sphere metric at these coordinates yields the same value; no Gleason-metric formula supplied.

    ⚠ This calculation is a PREDICTION of the sphere model, not independent evidence for it. Presenting it as observation would be circular.

    Physical verification · reproducible tests

    Record a southern long-haul with ADS-B($25–$120 total)

    Equipment

    • RTL-SDR USB receiver (~$25)
    • 1090 MHz antenna
    • PC or Raspberry Pi running dump1090 or readsb

    Record

    • Raw Mode-S/ADS-B messages
    • Receiver clock offset vs. NTP
    • Local weather during observation

    Steps

    1. Set up receiver with clear view of the sky along the expected track.
    2. Log all Mode-S messages for the flight window.
    3. Extract position reports (ICAO24, lat, lon, timestamp) into CSV.
    4. Plot the raw track on any map projection you choose without projecting the earth model into the raw lat/lon values.
    5. Compare integrated distance against the haversine prediction AND against any distance formula the opposing model supplies.

    Safety

    • Antenna placement — follow local electrical and roof safety codes.

    Confounding factors

    • Aircraft may deviate for weather, ATC, wind optimization.
    • ADS-B position itself is computed by the aircraft's GNSS — a globe-assumption pipeline.
    • Refraction and antenna geometry do not affect reported lat/lon, but do affect signal reception windows.

    Confirmation-bias controls

    • Publish raw messages before plotting on any map.
    • Have someone else derive the distance from the raw log without seeing your prediction.
    • Include failed captures and dropouts.

    Flat/enclosed predicts: No published quantitative Gleason-metric distance supplied for these endpoints — record raw track without assuming one.

    Globe predicts: Track follows a great circle curving south of a rhumb line; integrated distance ≈ published sphere value.

    Submit results: Attach the raw CSV, receiver log, and a written protocol via /community-science/submit. Do not upload a processed track without the raw source.

    Circular-reasoning check

    • Uses a model-generated value as if it were raw evidence

    Hidden assumptions

    • A specific cruise-speed band.
    • A specific competing projection's distance formula is stated before the observation is treated as decisive.

    Missing evidence

    • Point-by-point ADS-B tracks for the same routes to remove reliance on schedule pages.
    • A written derivation of the Gleason-projection distance between the same endpoints for direct comparison.

    Contradictions

    — none recorded —

    Reproducibility

    • Distances are reproducible via haversine; block times are reproducible from airline schedules for the same window.

    Confidence · moderate

    The math holds and the observation is public, but the claim is only decisive once the opposing model's distance is stated explicitly. Preserving that gap is the honest thing to do.

    Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

    Open in evidence graph →Browse sources
  • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

    Earth curvature is visible in horizon observations

    Unresolved

    Under standard atmospheric conditions, a distant object at height h below the geometric horizon is hidden by curvature by an amount predicted by the sphere geometry, adjusted by refraction.

    Origin: Topic acknowledged; primary sources not yet ingested into this record.

    Best supporting case

    Awaiting primary-source ingest before an authored comparison.

    Best opposing case

    Awaiting primary-source ingest before an authored comparison.

    Evidence

      Universal comparison · who claims what, and how each model explains it

      ExperimentalWho makes the claim: Geodesy and surveying references; contested by flat-earth advocates.

      Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

      Flat / enclosed model

      What it says: Distant objects appear low or vanish due to perspective and refraction on a plane; no curvature is present.

      Required assumptions: earth-oblate-spheroid, standard-atmosphere, observer-elevation

      Strongest objection: Awaiting primary-source ingest.

      Falsifier: Consistent hull-first disappearance and rising-with-elevation recovery inconsistent with any plane-plus-refraction profile.

      Globe model

      What it says: Objects at distance d beyond eye-height h drop by ≈ d²/(2R) − k·d²/(2R), with R ≈ 6371 km and k the local refraction coefficient.

      Required assumptions: earth-oblate-spheroid, standard-atmosphere, observer-elevation

      Strongest objection: Awaiting primary-source ingest.

      Falsifier: A calibrated telescope on a stable platform imaging the full base of a target at a distance where the sphere-plus-refraction prediction requires it to be hidden.

      Circular-reasoning check

      No circular-reasoning risks identified in the authored evidence chain.

      Knowledge library · claim → equation → law → assumptions

      Hidden assumptions

      — none recorded —

      Missing evidence

      • Primary sources for the flat-model explanation.
      • Primary sources for the globe-model explanation.
      • At least one reproducible physical test with independent replication.

      Contradictions

      — none recorded —

      Reproducibility

      • Not yet documented in this record.

      Confidence · not_rated

      This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

      Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

      Open in evidence graph →Browse sources
    • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

      Long-distance visibility across water

      Unresolved

      The maximum distance at which a target of stated height is visible from a stated observer height matches the sphere-plus-refraction prediction under recorded atmospheric conditions.

      Origin: Topic acknowledged; primary sources not yet ingested into this record.

      Best supporting case

      Awaiting primary-source ingest before an authored comparison.

      Best opposing case

      Awaiting primary-source ingest before an authored comparison.

      Evidence

        Universal comparison · who claims what, and how each model explains it

        ExperimentalWho makes the claim: Surveyors, navigators, and flat-earth investigators publish long-distance sightings.

        Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

        Flat / enclosed model

        What it says: Any object of sufficient size is visible until angular resolution or haze obscures it.

        Required assumptions: standard-atmosphere, observer-elevation, instrument-calibration

        Strongest objection: Awaiting primary-source ingest.

        Falsifier: Objects consistently and progressively hidden from the base upward as distance increases, tracked with atmospheric monitoring.

        Globe model

        What it says: Visibility ends when the geometric line of sight, corrected for refraction, no longer clears the intervening bulge.

        Required assumptions: standard-atmosphere, observer-elevation, instrument-calibration

        Strongest objection: Awaiting primary-source ingest.

        Falsifier: A calibrated sighting of a fully-visible target at distance/height ratios that require the base to be behind the bulge under measured k.

        Circular-reasoning check

        No circular-reasoning risks identified in the authored evidence chain.

        Knowledge library · claim → equation → law → assumptions

        Hidden assumptions

        — none recorded —

        Missing evidence

        • Primary sources for the flat-model explanation.
        • Primary sources for the globe-model explanation.
        • At least one reproducible physical test with independent replication.

        Contradictions

        — none recorded —

        Reproducibility

        • Not yet documented in this record.

        Confidence · not_rated

        This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

        Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

        Open in evidence graph →Browse sources
      • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

        Ships disappear hull-first over the horizon

        Unresolved

        As a ship recedes, its hull is occluded before its mast under conditions where the recorded refraction coefficient does not fully restore the line of sight.

        Origin: Topic acknowledged; primary sources not yet ingested into this record.

        Best supporting case

        Awaiting primary-source ingest before an authored comparison.

        Best opposing case

        Awaiting primary-source ingest before an authored comparison.

        Evidence

          Universal comparison · who claims what, and how each model explains it

          ExperimentalWho makes the claim: Maritime observers historically; disputed by observers using telephoto restoration.

          Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

          Flat / enclosed model

          What it says: Hull-first disappearance is an angular-resolution or refraction artefact and can be reversed with a stronger telescope.

          Required assumptions: standard-atmosphere, observer-elevation, instrument-calibration

          Strongest objection: Awaiting primary-source ingest.

          Falsifier: A repeatable dataset in which telescopic zoom cannot restore the hull once it has passed the predicted geometric horizon.

          Globe model

          What it says: Once the ship's hull passes below the tangent line from the observer's eye, no zoom can restore it — restoring the mast alone is expected.

          Required assumptions: standard-atmosphere, observer-elevation, instrument-calibration

          Strongest objection: Awaiting primary-source ingest.

          Falsifier: A single well-documented case where the full hull is restored at a distance sphere geometry says is impossible.

          Circular-reasoning check

          No circular-reasoning risks identified in the authored evidence chain.

          Knowledge library · claim → equation → law → assumptions

          Hidden assumptions

          — none recorded —

          Missing evidence

          • Primary sources for the flat-model explanation.
          • Primary sources for the globe-model explanation.
          • At least one reproducible physical test with independent replication.

          Contradictions

          — none recorded —

          Reproducibility

          • Not yet documented in this record.

          Confidence · not_rated

          This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

          Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

          Open in evidence graph →Browse sources
        • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

          Gleason's 1892 map and US patent 497,917

          Unresolved

          The 1892 Gleason map is documented by US patent 497,917 (1893) as a north-polar azimuthal-equidistant projection.

          Origin: Topic acknowledged; primary sources not yet ingested into this record.

          Best supporting case

          Awaiting primary-source ingest before an authored comparison.

          Best opposing case

          Awaiting primary-source ingest before an authored comparison.

          Evidence

            Universal comparison · who claims what, and how each model explains it

            HistoricalWho makes the claim: US Patent and Trademark Office; Boston Public Library archival record.

            Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

            Flat / enclosed model

            What it says: Some flat-earth advocates present the map as a literal chart of a flat Earth.

            Required assumptions: coordinate-system

            Strongest objection: Awaiting primary-source ingest.

            Falsifier: The patent's own construction description matching an azimuthal-equidistant projection of a sphere.

            Globe model

            What it says: The map is a specific projection of a spherical Earth; its geometry is reproduced by any modern azimuthal-equidistant renderer.

            Required assumptions: coordinate-system

            Strongest objection: Awaiting primary-source ingest.

            Falsifier: A demonstrated projection identity that cannot be reproduced from a sphere.

            Circular-reasoning check

            No circular-reasoning risks identified in the authored evidence chain.

            Knowledge library · claim → equation → law → assumptions

            Laws / principles

            — none —

            Hidden assumptions

            — none recorded —

            Missing evidence

            • Primary sources for the flat-model explanation.
            • Primary sources for the globe-model explanation.
            • At least one reproducible physical test with independent replication.

            Contradictions

            — none recorded —

            Reproducibility

            • Not yet documented in this record.

            Confidence · not_rated

            This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

            Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

            Open in evidence graph →Browse sources
          • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

            Every flat map introduces distortion

            Unresolved

            Because no smooth isometric map exists from a sphere to a plane (Gauss, Theorema Egregium), every flat map distorts area, angle, or distance.

            Origin: Topic acknowledged; primary sources not yet ingested into this record.

            Best supporting case

            Awaiting primary-source ingest before an authored comparison.

            Best opposing case

            Awaiting primary-source ingest before an authored comparison.

            Evidence

              Universal comparison · who claims what, and how each model explains it

              MathematicalWho makes the claim: Differential geometry; standard cartography references.

              Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

              Flat / enclosed model

              What it says: If the Earth is a plane, a 1:1 flat map is possible and distortion narratives conceal that possibility.

              Required assumptions: coordinate-system

              Strongest objection: Awaiting primary-source ingest.

              Falsifier: A physically-produced 1:1 flat map validated against surveyed distances across two hemispheres without breaking angle, area, or distance simultaneously.

              Globe model

              What it says: All projections make explicit trade-offs recorded in cartographic references.

              Required assumptions: coordinate-system

              Strongest objection: Awaiting primary-source ingest.

              Falsifier: A demonstrated flat map preserving all three of area, angle, and distance across the full sphere.

              Circular-reasoning check

              No circular-reasoning risks identified in the authored evidence chain.

              Knowledge library · claim → equation → law → assumptions

              Laws / principles

              — none —

              Theories / models

              Hidden assumptions

              — none recorded —

              Missing evidence

              • Primary sources for the flat-model explanation.
              • Primary sources for the globe-model explanation.
              • At least one reproducible physical test with independent replication.

              Contradictions

              — none recorded —

              Reproducibility

              • Not yet documented in this record.

              Confidence · not_rated

              This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

              Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

              Open in evidence graph →Browse sources
            • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

              Sun path and the origin of seasons

              Unresolved

              The seasonal variation of the sun's altitude and daylight length at a given latitude follows the pattern predicted by axial tilt of a rotating sphere orbiting the sun.

              Origin: Topic acknowledged; primary sources not yet ingested into this record.

              Best supporting case

              Awaiting primary-source ingest before an authored comparison.

              Best opposing case

              Awaiting primary-source ingest before an authored comparison.

              Evidence

                Universal comparison · who claims what, and how each model explains it

                ExperimentalWho makes the claim: Standard astronomical model; flat-earth counter-models propose a moving overhead sun.

                Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                Flat / enclosed model

                What it says: A near-overhead sun on a plane produces the observed daylight pattern through varying orbital radius or brightness cone.

                Required assumptions: celestial-distances

                Strongest objection: Awaiting primary-source ingest.

                Falsifier: Simultaneous daylight south of the Antarctic Circle during Southern-Hemisphere summer, inconsistent with a plane-model sun path.

                Globe model

                What it says: Axial tilt (23.4°) plus orbital motion produce the observed daylight, altitude, and polar-day patterns.

                Required assumptions: celestial-distances

                Strongest objection: Awaiting primary-source ingest.

                Falsifier: A polar-day/night pattern that does not match the sphere prediction for the recorded date and latitude.

                Circular-reasoning check

                No circular-reasoning risks identified in the authored evidence chain.

                Knowledge library · claim → equation → law → assumptions

                Hidden assumptions

                — none recorded —

                Missing evidence

                • Primary sources for the flat-model explanation.
                • Primary sources for the globe-model explanation.
                • At least one reproducible physical test with independent replication.

                Contradictions

                — none recorded —

                Reproducibility

                • Not yet documented in this record.

                Confidence · not_rated

                This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                Open in evidence graph →Browse sources
              • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                Lunar eclipses and the Earth's shadow

                Unresolved

                The Earth's shadow on the moon during a lunar eclipse is consistently circular for every eclipse geometry.

                Origin: Topic acknowledged; primary sources not yet ingested into this record.

                Best supporting case

                Awaiting primary-source ingest before an authored comparison.

                Best opposing case

                Awaiting primary-source ingest before an authored comparison.

                Evidence

                  Universal comparison · who claims what, and how each model explains it

                  ExperimentalWho makes the claim: Astronomical observations dating to antiquity; disputed as a 'selenelion' or third-body claim by some flat-earth writers.

                  Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                  Flat / enclosed model

                  What it says: Some flat models invoke an unseen third body ('Rahu', 'Selenelion object') to cast the shadow.

                  Required assumptions: light-in-vacuum, celestial-distances

                  Strongest objection: Awaiting primary-source ingest.

                  Falsifier: A photographic archive of eclipses showing consistent circularity of the shadow, with a stated ephemeris of the invoked body that predicts each eclipse.

                  Globe model

                  What it says: Only a spherical or near-spherical body casts a circular shadow at every orientation.

                  Required assumptions: light-in-vacuum, celestial-distances

                  Strongest objection: Awaiting primary-source ingest.

                  Falsifier: A lunar eclipse in which the Earth's shadow is non-circular under standard illumination geometry.

                  Circular-reasoning check

                  No circular-reasoning risks identified in the authored evidence chain.

                  Knowledge library · claim → equation → law → assumptions

                  Laws / principles

                  — none —

                  Theories / models

                  Hidden assumptions

                  — none recorded —

                  Missing evidence

                  • Primary sources for the flat-model explanation.
                  • Primary sources for the globe-model explanation.
                  • At least one reproducible physical test with independent replication.

                  Contradictions

                  — none recorded —

                  Reproducibility

                  • Not yet documented in this record.

                  Confidence · not_rated

                  This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                  Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                  Open in evidence graph →Browse sources
                • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                  Star trails rotate around different centers in the northern and southern skies

                  Unresolved

                  Long-exposure star trails circulate around a north celestial pole above the northern horizon and around a south celestial pole above the southern horizon, in opposite senses.

                  Origin: Topic acknowledged; primary sources not yet ingested into this record.

                  Best supporting case

                  Awaiting primary-source ingest before an authored comparison.

                  Best opposing case

                  Awaiting primary-source ingest before an authored comparison.

                  Evidence

                    Universal comparison · who claims what, and how each model explains it

                    ExperimentalWho makes the claim: Astrophotographers worldwide; disputed within some flat-earth frameworks.

                    Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                    Flat / enclosed model

                    What it says: A single overhead dome cannot produce two opposing rotation centers simultaneously without further modification.

                    Required assumptions: earth-oblate-spheroid

                    Strongest objection: Awaiting primary-source ingest.

                    Falsifier: A flat-model construction that reproduces both rotation centers from a single celestial dome.

                    Globe model

                    What it says: A rotating spherical Earth produces exactly two visible rotation centers, one per hemisphere, rotating in opposite senses.

                    Required assumptions: earth-oblate-spheroid

                    Strongest objection: Awaiting primary-source ingest.

                    Falsifier: A single sky-rotation center visible from every latitude simultaneously.

                    Circular-reasoning check

                    No circular-reasoning risks identified in the authored evidence chain.

                    Knowledge library · claim → equation → law → assumptions

                    Hidden assumptions

                    — none recorded —

                    Missing evidence

                    • Primary sources for the flat-model explanation.
                    • Primary sources for the globe-model explanation.
                    • At least one reproducible physical test with independent replication.

                    Contradictions

                    — none recorded —

                    Reproducibility

                    • Not yet documented in this record.

                    Confidence · not_rated

                    This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                    Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                    Open in evidence graph →Browse sources
                  • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                    Gravity versus density and buoyancy as the reason objects fall

                    Unresolved

                    Objects fall because of mass-based gravitational attraction (Newton/Einstein) — versus — objects fall because of density differences in a downward field whose origin is left open.

                    Origin: Topic acknowledged; primary sources not yet ingested into this record.

                    Best supporting case

                    Awaiting primary-source ingest before an authored comparison.

                    Best opposing case

                    Awaiting primary-source ingest before an authored comparison.

                    Evidence

                      Universal comparison · who claims what, and how each model explains it

                      InterpretiveWho makes the claim: Standard physics; density-only advocates in flat-earth communities.

                      Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                      Flat / enclosed model

                      What it says: A downward field g exists; falling is fully explained by density differences without invoking mass–mass attraction.

                      Required assumptions: mass-attraction, downward-field-g

                      Strongest objection: Awaiting primary-source ingest.

                      Falsifier: Reproducing a Cavendish-style torsion-balance signal at multiple laboratories with the expected 1/r² dependence.

                      Globe model

                      What it says: Mass–mass attraction (Cavendish 1798 onward) is measured directly and matches Newton's 1/r² law.

                      Required assumptions: mass-attraction, downward-field-g

                      Strongest objection: Awaiting primary-source ingest.

                      Falsifier: A carefully replicated null result from a modern equivalent of the Cavendish experiment.

                      Circular-reasoning check

                      No circular-reasoning risks identified in the authored evidence chain.

                      Knowledge library · claim → equation → law → assumptions

                      Hidden assumptions

                      — none recorded —

                      Missing evidence

                      • Primary sources for the flat-model explanation.
                      • Primary sources for the globe-model explanation.
                      • At least one reproducible physical test with independent replication.

                      Contradictions

                      — none recorded —

                      Reproducibility

                      • Not yet documented in this record.

                      Confidence · not_rated

                      This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                      Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                      Open in evidence graph →Browse sources
                    • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                      Bedford Level experiment (Rowbotham 1838, Wallace 1870)

                      Unresolved

                      Sightings along the Old Bedford River were used first by Rowbotham (1838) to argue against Earth curvature and later by Wallace (1870) to argue for it, over a ~6 mile stretch.

                      Origin: Topic acknowledged; primary sources not yet ingested into this record.

                      Best supporting case

                      Awaiting primary-source ingest before an authored comparison.

                      Best opposing case

                      Awaiting primary-source ingest before an authored comparison.

                      Evidence

                        Universal comparison · who claims what, and how each model explains it

                        HistoricalWho makes the claim: Samuel Rowbotham (flat), Alfred Russel Wallace (globe); primary-source correspondence and drawings.

                        Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                        Flat / enclosed model

                        What it says: Rowbotham's sightings show no drop across ~6 miles, therefore no curvature.

                        Required assumptions: standard-atmosphere, observer-elevation, instrument-calibration

                        Strongest objection: Awaiting primary-source ingest.

                        Falsifier: A modern well-instrumented replication showing base-of-target occlusion in-line with sphere-plus-refraction geometry.

                        Globe model

                        What it says: Wallace's staggered-marker experiment on the same water shows the middle marker rising above the line — consistent with curvature under measured refraction.

                        Required assumptions: standard-atmosphere, observer-elevation, instrument-calibration

                        Strongest objection: Awaiting primary-source ingest.

                        Falsifier: A modern well-instrumented replication showing three collinear markers across ~6 miles.

                        Circular-reasoning check

                        No circular-reasoning risks identified in the authored evidence chain.

                        Knowledge library · claim → equation → law → assumptions

                        Laws / principles

                        Hidden assumptions

                        — none recorded —

                        Missing evidence

                        • Primary sources for the flat-model explanation.
                        • Primary sources for the globe-model explanation.
                        • At least one reproducible physical test with independent replication.

                        Contradictions

                        — none recorded —

                        Reproducibility

                        • Not yet documented in this record.

                        Confidence · not_rated

                        This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                        Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                        Open in evidence graph →Browse sources
                      • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                        Michelson–Morley experiment (1887) and the aether hypothesis

                        Unresolved

                        Michelson and Morley (1887) reported no measurable fringe shift attributable to Earth's motion through a stationary luminiferous aether.

                        Origin: Topic acknowledged; primary sources not yet ingested into this record.

                        Best supporting case

                        Awaiting primary-source ingest before an authored comparison.

                        Best opposing case

                        Awaiting primary-source ingest before an authored comparison.

                        Evidence

                          Universal comparison · who claims what, and how each model explains it

                          ExperimentalWho makes the claim: Michelson & Morley, American Journal of Science (1887); reinterpreted by many later frameworks.

                          Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                          Flat / enclosed model

                          What it says: Cited by some as evidence the Earth is not moving through space — supporting a stationary Earth in either flat or geocentric variants.

                          Required assumptions: light-in-vacuum

                          Strongest objection: Awaiting primary-source ingest.

                          Falsifier: A modern replication detecting a fringe shift at the level Michelson–Morley predicted for a moving Earth in aether.

                          Globe model

                          What it says: Interpreted in relativity as evidence that the speed of light is invariant — motion through aether is unobservable because no aether frame exists.

                          Required assumptions: light-in-vacuum

                          Strongest objection: Awaiting primary-source ingest.

                          Falsifier: A repeatable directional fringe shift consistent with a preferred aether frame.

                          Circular-reasoning check

                          No circular-reasoning risks identified in the authored evidence chain.

                          Knowledge library · claim → equation → law → assumptions

                          Assumptions

                          Hidden assumptions

                          — none recorded —

                          Missing evidence

                          • Primary sources for the flat-model explanation.
                          • Primary sources for the globe-model explanation.
                          • At least one reproducible physical test with independent replication.

                          Contradictions

                          — none recorded —

                          Reproducibility

                          • Not yet documented in this record.

                          Confidence · not_rated

                          This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                          Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                          Open in evidence graph →Browse sources
                        • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                          Sagnac effect and rotating interferometers

                          Unresolved

                          A ring interferometer measures a phase shift proportional to the rotation rate of its frame relative to inertial space.

                          Origin: Topic acknowledged; primary sources not yet ingested into this record.

                          Best supporting case

                          Awaiting primary-source ingest before an authored comparison.

                          Best opposing case

                          Awaiting primary-source ingest before an authored comparison.

                          Evidence

                            Universal comparison · who claims what, and how each model explains it

                            ExperimentalWho makes the claim: Georges Sagnac (1913) and every subsequent ring-laser and fibre-optic gyro deployment.

                            Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                            Flat / enclosed model

                            What it says: The signal is real; interpreted as evidence of an aether or absolute rest frame that would falsify special relativity's naive reading.

                            Required assumptions: light-in-vacuum, instrument-calibration

                            Strongest objection: Awaiting primary-source ingest.

                            Falsifier: A rigorous derivation showing Sagnac's result inevitably follows from special-relativity kinematics in a rotating frame.

                            Globe model

                            What it says: Standard treatment derives Sagnac from Maxwell's equations in a rotating frame; ring-laser gyros routinely measure Earth's ≈ 15°/h rotation.

                            Required assumptions: light-in-vacuum, instrument-calibration

                            Strongest objection: Awaiting primary-source ingest.

                            Falsifier: A calibrated ring-laser gyro repeatedly failing to register a rotation-rate signal on a stationary lab bench.

                            Circular-reasoning check

                            No circular-reasoning risks identified in the authored evidence chain.

                            Knowledge library · claim → equation → law → assumptions

                            Hidden assumptions

                            — none recorded —

                            Missing evidence

                            • Primary sources for the flat-model explanation.
                            • Primary sources for the globe-model explanation.
                            • At least one reproducible physical test with independent replication.

                            Contradictions

                            — none recorded —

                            Reproducibility

                            • Not yet documented in this record.

                            Confidence · not_rated

                            This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                            Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                            Open in evidence graph →Browse sources
                          • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                            Foucault pendulum plane rotation

                            Unresolved

                            A long, freely-swinging pendulum's plane of oscillation rotates at a rate ω sin(φ), where φ is latitude and ω is Earth's sidereal rotation rate.

                            Origin: Topic acknowledged; primary sources not yet ingested into this record.

                            Best supporting case

                            Awaiting primary-source ingest before an authored comparison.

                            Best opposing case

                            Awaiting primary-source ingest before an authored comparison.

                            Evidence

                              Universal comparison · who claims what, and how each model explains it

                              ExperimentalWho makes the claim: Léon Foucault (1851); installations reproduce it worldwide.

                              Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                              Flat / enclosed model

                              What it says: The observed rotation is attributed to installation asymmetries, magnetic driving, or air currents rather than a rotating Earth.

                              Required assumptions: earth-oblate-spheroid, instrument-calibration

                              Strongest objection: Awaiting primary-source ingest.

                              Falsifier: Blinded installations at varied latitudes producing the ω sin(φ) latitude dependence without common installation bias.

                              Globe model

                              What it says: The rotation matches the Coriolis prediction for a rotating spherical Earth at the measured latitude.

                              Required assumptions: earth-oblate-spheroid, instrument-calibration

                              Strongest objection: Awaiting primary-source ingest.

                              Falsifier: A calibrated pendulum at a stated latitude showing no rotation over many hours.

                              Circular-reasoning check

                              No circular-reasoning risks identified in the authored evidence chain.

                              Knowledge library · claim → equation → law → assumptions

                              Laws / principles

                              Theories / models

                              Hidden assumptions

                              — none recorded —

                              Missing evidence

                              • Primary sources for the flat-model explanation.
                              • Primary sources for the globe-model explanation.
                              • At least one reproducible physical test with independent replication.

                              Contradictions

                              — none recorded —

                              Reproducibility

                              • Not yet documented in this record.

                              Confidence · not_rated

                              This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                              Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                              Open in evidence graph →Browse sources
                            • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                              Coriolis deflection in artillery, ballistics, and weather

                              Unresolved

                              Long-range ballistic trajectories and large-scale atmospheric flows show a deflection consistent with a Coriolis parameter f = 2 Ω sin(φ).

                              Origin: Topic acknowledged; primary sources not yet ingested into this record.

                              Best supporting case

                              Awaiting primary-source ingest before an authored comparison.

                              Best opposing case

                              Awaiting primary-source ingest before an authored comparison.

                              Evidence

                                Universal comparison · who claims what, and how each model explains it

                                ExperimentalWho makes the claim: Ballistics tables of major militaries; standard meteorology.

                                Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                                Flat / enclosed model

                                What it says: Observed deflections are explained by wind, aerodynamics, and target motion without a rotating Earth.

                                Required assumptions: earth-oblate-spheroid

                                Strongest objection: Awaiting primary-source ingest.

                                Falsifier: A ballistic dataset spanning multiple latitudes whose deflection tracks f = 2 Ω sin(φ) after wind correction.

                                Globe model

                                What it says: Ballistic and meteorological corrections match Coriolis with Ω ≈ 7.29e-5 rad/s.

                                Required assumptions: earth-oblate-spheroid

                                Strongest objection: Awaiting primary-source ingest.

                                Falsifier: A well-instrumented long-range firing programme finding zero latitude-dependent deflection after wind correction.

                                Circular-reasoning check

                                No circular-reasoning risks identified in the authored evidence chain.

                                Knowledge library · claim → equation → law → assumptions

                                Laws / principles

                                Theories / models

                                Hidden assumptions

                                — none recorded —

                                Missing evidence

                                • Primary sources for the flat-model explanation.
                                • Primary sources for the globe-model explanation.
                                • At least one reproducible physical test with independent replication.

                                Contradictions

                                — none recorded —

                                Reproducibility

                                • Not yet documented in this record.

                                Confidence · not_rated

                                This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                                Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                                Open in evidence graph →Browse sources
                              • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                                Surveying and geodetic networks assume — and measure — a curved Earth

                                Unresolved

                                National geodetic datums (NAD83, ETRS89, ITRF) treat the Earth as an ellipsoid and record surveyed distances that would otherwise not close on a plane.

                                Origin: Topic acknowledged; primary sources not yet ingested into this record.

                                Best supporting case

                                Awaiting primary-source ingest before an authored comparison.

                                Best opposing case

                                Awaiting primary-source ingest before an authored comparison.

                                Evidence

                                  Universal comparison · who claims what, and how each model explains it

                                  ExperimentalWho makes the claim: National geodetic services; IERS.

                                  Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                                  Flat / enclosed model

                                  What it says: Corrections may be conventions of the reference system rather than proof of curvature.

                                  Required assumptions: earth-oblate-spheroid, coordinate-system, instrument-calibration

                                  Strongest objection: Awaiting primary-source ingest.

                                  Falsifier: A large-scale independent survey performed on a plane model whose closure errors are as small as ellipsoidal ones.

                                  Globe model

                                  What it says: The residual closure errors of continental triangulation networks match the ellipsoid to millimetres.

                                  Required assumptions: earth-oblate-spheroid, coordinate-system, instrument-calibration

                                  Strongest objection: Awaiting primary-source ingest.

                                  Falsifier: A published continental-scale survey with closure errors matching a plane model within its stated uncertainty.

                                  Circular-reasoning check

                                  No circular-reasoning risks identified in the authored evidence chain.

                                  Knowledge library · claim → equation → law → assumptions

                                  Laws / principles

                                  — none —

                                  Theories / models

                                  Hidden assumptions

                                  — none recorded —

                                  Missing evidence

                                  • Primary sources for the flat-model explanation.
                                  • Primary sources for the globe-model explanation.
                                  • At least one reproducible physical test with independent replication.

                                  Contradictions

                                  — none recorded —

                                  Reproducibility

                                  • Not yet documented in this record.

                                  Confidence · not_rated

                                  This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                                  Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                                  Open in evidence graph →Browse sources
                                • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                                  Satellite orbits and GPS positioning

                                  Unresolved

                                  The GPS constellation broadcasts ephemeris and clock data consistent with satellites in Keplerian orbits around a spherical Earth, and receivers compute positions via time-of-flight trilateration.

                                  Origin: Topic acknowledged; primary sources not yet ingested into this record.

                                  Best supporting case

                                  Awaiting primary-source ingest before an authored comparison.

                                  Best opposing case

                                  Awaiting primary-source ingest before an authored comparison.

                                  Evidence

                                    Universal comparison · who claims what, and how each model explains it

                                    ExperimentalWho makes the claim: US Space Force GPS Directorate; ICD-GPS-200 specification.

                                    Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                                    Flat / enclosed model

                                    What it says: Some flat-earth accounts propose ground-based transmitters, high-altitude relays, or 'stratellites' as the actual signal source.

                                    Required assumptions: earth-oblate-spheroid, celestial-distances, imagery-admissibility

                                    Strongest objection: Awaiting primary-source ingest.

                                    Falsifier: An independent radio-astronomy team receiving GPS L1 signals from a source above the geostationary shell would refute this.

                                    Globe model

                                    What it says: Satellites at ≈ 20,200 km altitude produce the observed pseudo-range residuals to millimetre precision after ionosphere/troposphere correction.

                                    Required assumptions: earth-oblate-spheroid, celestial-distances, imagery-admissibility

                                    Strongest objection: Awaiting primary-source ingest.

                                    Falsifier: A calibrated antenna array producing directional signal-source fixes below the horizon rather than at MEO altitudes.

                                    Circular-reasoning check

                                    No circular-reasoning risks identified in the authored evidence chain.

                                    Knowledge library · claim → equation → law → assumptions

                                    Hidden assumptions

                                    — none recorded —

                                    Missing evidence

                                    • Primary sources for the flat-model explanation.
                                    • Primary sources for the globe-model explanation.
                                    • At least one reproducible physical test with independent replication.

                                    Contradictions

                                    — none recorded —

                                    Reproducibility

                                    • Not yet documented in this record.

                                    Confidence · not_rated

                                    This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                                    Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                                    Open in evidence graph →Browse sources
                                  • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                                    Water always seeks its level

                                    Unresolved

                                    A free liquid at rest under a uniform downward field has a surface of constant gravitational potential; on Earth this is an equipotential surface (the geoid).

                                    Origin: Topic acknowledged; primary sources not yet ingested into this record.

                                    Best supporting case

                                    Awaiting primary-source ingest before an authored comparison.

                                    Best opposing case

                                    Awaiting primary-source ingest before an authored comparison.

                                    Evidence

                                      Universal comparison · who claims what, and how each model explains it

                                      FactualWho makes the claim: Fluid statics (Pascal, Bernoulli); geodesists.

                                      Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                                      Flat / enclosed model

                                      What it says: The phrase is used to argue oceans could not curve; therefore Earth cannot be a globe.

                                      Required assumptions: downward-field-g

                                      Strongest objection: Awaiting primary-source ingest.

                                      Falsifier: A demonstration that an equipotential surface on a sphere is not curved.

                                      Globe model

                                      What it says: On a sphere the equipotential surface is itself curved; water on it follows the geoid, not a flat plane.

                                      Required assumptions: downward-field-g

                                      Strongest objection: Awaiting primary-source ingest.

                                      Falsifier: A large water body whose free surface departs from the geoid under still conditions.

                                      Circular-reasoning check

                                      No circular-reasoning risks identified in the authored evidence chain.

                                      Knowledge library · claim → equation → law → assumptions

                                      Theories / models

                                      Assumptions

                                      Hidden assumptions

                                      — none recorded —

                                      Missing evidence

                                      • Primary sources for the flat-model explanation.
                                      • Primary sources for the globe-model explanation.
                                      • At least one reproducible physical test with independent replication.

                                      Contradictions

                                      — none recorded —

                                      Reproducibility

                                      • Not yet documented in this record.

                                      Confidence · not_rated

                                      This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                                      Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                                      Open in evidence graph →Browse sources
                                    • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                                      Atmospheric refraction bends the line of sight downward

                                      Unresolved

                                      Under standard atmosphere, light propagating near-horizontally is bent by a coefficient k such that the effective Earth radius R' ≈ R / (1 − k), typically k ≈ 0.13.

                                      Origin: Topic acknowledged; primary sources not yet ingested into this record.

                                      Best supporting case

                                      Awaiting primary-source ingest before an authored comparison.

                                      Best opposing case

                                      Awaiting primary-source ingest before an authored comparison.

                                      Evidence

                                        Universal comparison · who claims what, and how each model explains it

                                        MathematicalWho makes the claim: Standard geodesy (Rueger, Torge); disputed magnitude and sign under inversion layers.

                                        Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                                        Flat / enclosed model

                                        What it says: Refraction can explain any observation attributed to curvature — including hull-first disappearance — and thus curvature has no independent evidence.

                                        Required assumptions: standard-atmosphere, light-in-vacuum

                                        Strongest objection: Awaiting primary-source ingest.

                                        Falsifier: A dataset where measured k is bounded but the observation still requires a curved Earth to explain.

                                        Globe model

                                        What it says: Refraction is real but its magnitude is measurable; when subtracted, residual curvature remains as observed.

                                        Required assumptions: standard-atmosphere, light-in-vacuum

                                        Strongest objection: Awaiting primary-source ingest.

                                        Falsifier: A rigorous multi-site campaign in which every long-distance observation can be explained purely by measured k on a plane.

                                        Circular-reasoning check

                                        No circular-reasoning risks identified in the authored evidence chain.

                                        Knowledge library · claim → equation → law → assumptions

                                        Hidden assumptions

                                        — none recorded —

                                        Missing evidence

                                        • Primary sources for the flat-model explanation.
                                        • Primary sources for the globe-model explanation.
                                        • At least one reproducible physical test with independent replication.

                                        Contradictions

                                        — none recorded —

                                        Reproducibility

                                        • Not yet documented in this record.

                                        Confidence · not_rated

                                        This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                                        Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                                        Open in evidence graph →Browse sources
                                      • Incomplete — primary sources not yet ingestedThe universal comparison scaffold below is a placeholder. Do not treat empty sections as evidence.

                                        Biblical firmament, circle of the Earth, and foundations passages

                                        Unresolved

                                        Old Testament passages including Gen 1:6–8 (raqia/firmament), Isa 40:22 (chug/circle), Job 26:7 (Earth hung on nothing), and 1 Sam 2:8 (pillars/foundations) are cited by both flat-earth advocates and orthodox theologians for conflicting cosmological conclusions.

                                        Origin: Topic acknowledged; primary sources not yet ingested into this record.

                                        Best supporting case

                                        Awaiting primary-source ingest before an authored comparison.

                                        Best opposing case

                                        Awaiting primary-source ingest before an authored comparison.

                                        Evidence

                                          Universal comparison · who claims what, and how each model explains it

                                          TheologicalWho makes the claim: Ancient Hebrew scribes; interpreters ranging from Ancient Near East scholars to modern young-earth and flat-earth communities.

                                          Scope: See exact wording for scope and definitions; further scoping to follow with primary sources.

                                          Flat / enclosed model

                                          What it says: Passages describe a solid firmament dome, a flat disc circle, and pillar foundations under a stationary Earth.

                                          Required assumptions: scriptural-interpretive-frame

                                          Strongest objection: Awaiting primary-source ingest.

                                          Falsifier: A demonstration that the Hebrew text lexically requires a non-solid, non-planar reading in every disputed passage.

                                          Globe model

                                          What it says: Passages use phenomenological / poetic language compatible with any physical cosmology; theology is not decided by projection choice.

                                          Required assumptions: scriptural-interpretive-frame

                                          Strongest objection: Awaiting primary-source ingest.

                                          Falsifier: A demonstration that the Hebrew text lexically requires a spherical reading in every disputed passage.

                                          Biblical interpretation

                                          Passage(s): Gen 1:6–8; Isa 40:22; Job 26:7; 1 Sam 2:8; Prov 8:27; Ps 104:5; Rev 7:1

                                          Translation: Compare Masoretic (Hebrew) and Septuagint (Greek) alongside a widely-used English translation (e.g. ESV, KJV). Do not rely on English alone.

                                          Literary context: Genesis 1: liturgical creation narrative. Isaiah 40: prophetic-poetic. Job 26: poetic response to Bildad. 1 Samuel 2: Hannah's prayer, poetic. Psalms/Proverbs: wisdom/liturgical. Revelation: apocalyptic imagery.

                                          Original-language notes: Hebrew 'raqia' (רָקִיעַ) is used elsewhere for a beaten metal expanse. 'Chug' (חוּג) denotes a circle, compass, or circuit — used in Isa 40:22, Prov 8:27, Job 22:14 — and no cited lexicon (BDB, HALOT) defines it as 'sphere.' The distinct noun 'kaddur' (כַּדּוּר), 'ball,' is used by the same prophet in Isa 22:18, showing that ball-language was available and was not chosen in Isa 40:22. Commentators (Rashi, Ibn Ezra, Calvin) disagree on the cosmological implications, but the lexical meaning of chug remains circular, not spherical.

                                          What the passage explicitly states: That God created the heavens and the earth, that God spans/sits above/circumscribes them, and that the earth's stability is God-ordained. The physical three-dimensional shape is not explicitly asserted in any single passage.

                                          What requires interpretation: Whether raqia is solid, whether chug ha-aretz refers to a flat circular Earth, the visible horizon/circuit, or is merely compatible with a globe (compatibility is not explicit description), and whether pillars/foundations are load-bearing structures or covenantal language.

                                          Major interpretive positions

                                          • Ancient-Near-East accommodation: text uses the cosmology of its human authors; theological content survives cosmological updating.
                                          • Literal flat cosmology: raqia is a solid dome, chug is a flat disc, and pillars are physical supports; no accommodation.
                                          • Phenomenological literalism: language describes appearances from the observer's viewpoint without asserting a physical model.

                                          Circular-reasoning check

                                          No circular-reasoning risks identified in the authored evidence chain.

                                          Knowledge library · claim → equation → law → assumptions

                                          Laws / principles

                                          — none —

                                          Theories / models

                                          Hidden assumptions

                                          — none recorded —

                                          Missing evidence

                                          • Primary sources for the flat-model explanation.
                                          • Primary sources for the globe-model explanation.
                                          • At least one reproducible physical test with independent replication.

                                          Contradictions

                                          — none recorded —

                                          Reproducibility

                                          • Not yet documented in this record.

                                          Confidence · not_rated

                                          This record is a structural placeholder. Confidence will only be rated once primary sources and reasoning chain are authored.

                                          Confidence is authored, not tallied. It reflects primary vs. secondary evidence, source independence, methodology, conflicts, and reproducibility — not the count of sources.

                                          Open in evidence graph →Browse sources