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AREA 42 // EVIDENCE DOSSIER

DOSSIER A42-06 // PLANETARY GEOMETRY

Flat Earth claims

The claim

Earth is said to be a flat plane, with photographs, satellite imagery, gravity, and spaceflight dismissed as fabricated or misinterpreted.

What the record supports

Earth's approximate oblate-spheroid shape is supported by geodesy, navigation, time zones, satellite tracking, eclipses, long-distance observations, and measurements made with independent methods. Local surfaces look flat because Earth's curvature is small at everyday scales.

Assessment: The flat-Earth model does not account for the combined, independently reproducible observations as well as the measured globe model. A single visual perspective or an imperfect image is not a substitute for a coherent model that makes accurate predictions.

Useful checks

  • Repeat measurements at different locations and times, such as shadow-angle comparisons, star altitude, or horizon observations.
  • Compare predictions for solar illumination, lunar eclipses, long-distance routes, and satellite passes.
  • Use known survey methods and instrument uncertainty; do not treat perspective, refraction, or camera lenses as negligible.
  1. NOAA Ocean Service — Is the Earth round?Earth's shape and measurement overview.
  2. NOAA National Geodetic SurveyGeodetic reference systems, coordinates, and measurement resources.
  3. NASA — Earth observationsSatellite and Earth science data and mission context.

Competing models and repeatable tests

Earth's shape is established by more than photographs from space. Surveying, geodesy, satellite orbits, timekeeping, lunar eclipses, changing star altitudes with latitude, and observations of distant objects each constrain a model. These measurements are made by different institutions and countries for practical navigation and science. Local terrain and atmospheric refraction can complicate an individual horizon observation, so claims should specify instrument height, weather, distance, and measurement error.

A viable alternative must predict those observations together, not explain each one after the fact with a different ad hoc mechanism. Simple shadow-angle comparisons at distant locations, done at the same time and with locations measured carefully, are independently repeatable. Imperfect images or mistakes in one lesson do not overturn a model whose predictions are repeatedly tested in unrelated settings.