1. ANSWER — Credible sources indicate the Earth is an oblate spheroid, not flat. Evidence suggests overwhelming scientific consensus for a spherical Earth, with flat Earth claims consistently debunked by observations, experiments, and imagery.123

2. EVIDENCE — Wikipedia's "Empirical evidence for the spherical shape of Earth" (ongoing, accessed 2026) lists observations like ships vanishing hull-first over the horizon, lunar eclipse shadows, and star patterns varying by latitude.2 NASA's "How Do We Know the Earth Isn't Flat?" (March 11, 2025) cites ancient navigation, satellite geodesy, and space imagery showing curvature.4 A New York Post article (April 7, 2026) references a recent Orion spacecraft photo depicting Earth as a sphere.5 Flat Earth searches yielded no peer-reviewed support; instead, articles like Britannica's "Flat Earth" (updated 2026) describe it as archaic and disproven.6 Flat Earth "experiments" (e.g., 2023 laser tests, 2024 Antarctica trip) backfired due to refraction or confirmed curvature.78

3. CRITICAL CONTEXT — Skepticism may stem from distrust in NASA/government (accused of faking space photos), personal horizon observations seeming flat at ground level, or social media echo chambers amplifying unverified claims. Legitimate questions about institutional transparency exist (e.g., historical photo editing), but these do not override verifiable experiments anyone can replicate, like Eratosthenes' well test (3rd century BCE, replicated today). No major transparency gaps undermine the core evidence.

STRONGEST SUPPORTING ARGUMENT — Flat Earth proponents cite 19th-century Bedford Level experiments by Samuel Rowbotham, claiming canal water stayed level over miles, suggesting no curvature (Answers in Genesis, Feb 5, 2021).9 They argue horizons appear flat and water seeks level, incompatible with a globe, as seen in modern YouTube "proofs." However, these rely on low-altitude views ignoring scale (Earth's radius ~6,371 km) and are explained by atmospheric refraction bending light.

STRONGEST COUNTERARGUMENT — Lunar eclipses cast a circular shadow on the Moon, visible globally and only possible from a sphere (Wikipedia, ongoing; Sky at Night Magazine, Aug 29, 2025).210 Ships disappear hull-first over horizons; constellations differ by hemisphere (e.g., Southern Cross invisible north); circumnavigation works east-west but not north-south on a disk; thousands of satellite photos show curvature, including NASA's 2026 Orion image (NY Post, Apr 7, 2026).5 Flat Earthers' 2023 laser experiment and 2024 Antarctica trip confirmed curvature/refraction (Jerusalem Post, Jun 22, 2023; IFLScience, Sep 4, 2025).78

BOTTOM LINE — The Earth is not flat; it is an oblate spheroid, as directly observed in space photos, eclipses, and replicated experiments like horizon vanishings that contradict flat models.

5. CREDIBILITY — 1

6. EVIDENCE — 10

7. BIAS — CENTER

8. CATEGORY — Conspiracy & Fringe