Is earth flat?

GPT-5.4

Vote: No

Earth is not flat; it is an oblate spheroid, slightly flattened at the poles and bulging at the equator. This is supported by multiple independent lines of evidence: satellite imagery, circumnavigation, time zones, lunar eclipses showing Earth’s round shadow, and the way ships disappear hull-first over the horizon. Gravity pulls matter toward a common center of mass, which naturally produces a nearly spherical shape for a planet-sized body. Modern geodesy and spaceflight confirm this directly.

Sonar Pro

Vote: No

The Earth is not flat; it is an oblate spheroid, as established by centuries of scientific evidence including satellite imagery, GPS data, gravitational measurements, and direct observations from space. Photographs from NASA and other space agencies clearly show Earth's curvature, and phenomena like lunar eclipses, ship hulls disappearing over the horizon, and varying constellations by latitude contradict flat Earth claims. No credible scientific source supports a flat Earth model; it's a debunked conspiracy theory refuted by physics, astronomy, and everyday navigation.

Grok 4.1 Fast

Vote: No

The Earth is an oblate spheroid, overwhelmingly confirmed by centuries of scientific evidence. Satellite imagery from NASA, ESA, and private companies like SpaceX shows a curved horizon and full globe views. Circumnavigation works seamlessly in all directions, impossible on a flat plane. Gravity pulls matter into spheres for large bodies; a flat Earth would collapse under its own weight. Ships vanish hull-first over the horizon due to curvature. Lunar eclipses cast a circular shadow, consistent only with a spherical Earth. Foucault's pendulum demonstrates rotation, varying by latitude. No credible evidence supports flat Earth; all observations align with a globe model.

Kimi K2.5

Vote: No

The Earth is not flat; it is an oblate spheroid. Multiple lines of empirical evidence confirm this shape beyond reasonable doubt. Observational evidence from everyday experience disproves flatness. Ships disappear over the horizon hull-first, not shrinking uniformly. The horizon itself falls below eye level at altitude, curving consistently in every direction. During lunar eclipses, Earth's shadow on the Moon is always circular—a geometric impossibility for a flat disk but inevitable for a sphere. Global navigation and imaging provide definitive proof. Satellite photographs consistently show a spherical Earth, and circumnavigation is possible in any direction without reaching an edge. GPS systems and modern aviation routes rely on spherical geometry, calculating great-circle distances that would be impossible on a flat plane. Physical geography and astronomy further confirm this. Different hemispheres see different constellations, and time zones result from a rotating sphere facing the Sun. Gravity measurements are consistent with a spherical mass distribution, whereas a flat Earth would require impossible physics to explain downward gravitational pull across the entire surface.

Gemini 3.1 Pro

Vote: No

Scientific consensus and empirical evidence overwhelmingly prove that the Earth is an oblate spheroid, not flat. We can observe this daily through satellite imagery, the curvature of the Earth visible from high altitudes, and the way ships disappear hull-first over the horizon. Furthermore, physical phenomena such as gravity pulling matter toward its center, different constellations being visible from different hemispheres, and the projection of a round shadow on the moon during a lunar eclipse firmly confirm its spherical shape.

Final Summary

The AI Roundtable met to address a question of fundamental geography, resulting in a swift and unanimous confirmation of the globe. Every participant, including GPT-5.4 and Gemini 3.1 Pro, dismissed the flat Earth premise by citing a mountain of empirical evidence from gravitational physics to direct satellite observation.

No agreement after 1 rounds of discussion. Final vote: No: 5

Strongest Arguments

• No: The geometric impossibility of a flat disk casting a circular shadow on the moon during every lunar eclipse, combined with the fact that gravity naturally pulls large masses into spherical shapes.