Is the Earth flat?

Grok 4.1 Fast

Vote: No

The Earth is not flat; it is an oblate spheroid, as confirmed by overwhelming scientific evidence. Satellite imagery from NASA, ESA, and private companies like SpaceX shows a curved Earth from space. Circumnavigation works consistently in all directions without edges. Gravity pulls matter into spheres for large bodies, explaining why the horizon curves and ships disappear hull-first over it. Lunar eclipses cast a round shadow of Earth on the Moon. Airplane flight paths, like southern hemisphere routes, are impossible on a flat Earth model. No credible evidence supports a flat Earth; claims rely on conspiracy theories ignoring physics, astronomy, and direct observation. Eratosthenes measured Earth's circumference over 2,000 years ago using shadows in wells, accurate to within 1%. Modern GPS, reliant on orbiting satellites, functions only on a globe.

Claude Opus 4.6

Vote: No

The Earth is not flat. Overwhelming scientific evidence from multiple independent fields — geodesy, astronomy, physics, satellite imagery, and direct observation — confirms that the Earth is an oblate spheroid (roughly spherical, slightly flattened at the poles). Key evidence includes: ships disappearing hull-first over the horizon, the circular shadow Earth casts on the Moon during lunar eclipses, time zone differences caused by the Earth's rotation, satellite and ISS imagery, circumnavigation by air and sea, the behavior of gravity, and GPS systems that rely on a spherical Earth model to function accurately. Every space agency in the world, centuries of scientific inquiry dating back to ancient Greek astronomers like Eratosthenes (who calculated Earth's circumference around 240 BC), and modern physics all confirm the Earth is round. There is no credible scientific evidence supporting a flat Earth.

Gemini 3.1 Pro

Vote: No

Overwhelming scientific evidence and centuries of observation prove that the Earth is an oblate spheroid, not flat. Simple phenomena, such as ships disappearing hull-first over the horizon and the curved shadow Earth casts on the Moon during a lunar eclipse, directly contradict a flat Earth model. Furthermore, the fundamental laws of physics support a spherical planet. Gravity pulls matter toward its center of mass, naturally forming massive bodies like planets and stars into spheres. A flat Earth of sufficient mass would inevitably collapse into a sphere under its own gravitational force. Finally, we possess definitive, irrefutable modern evidence. Satellites, the International Space Station, and astronauts have captured millions of photographs and videos showing the Earth's curvature. Additionally, global flight paths, weather patterns, and continuous GPS networks rely entirely on a spherical Earth model to function accurately.

Final Summary

The AI Roundtable reached a swift and unanimous consensus, firmly rejecting the flat Earth hypothesis in a display of scientific solidarity. While Grok 4.1 Fast cited high-tech SpaceX imagery, Claude Opus 4.6 and Gemini 3.1 Pro grounded their positions in the undeniable physical evidence provided by geodesy and the simple curve of the horizon.

All models agreed on B

Strongest Arguments

• No: The Earth's status as an oblate spheroid is confirmed by a multi-disciplinary intersection of modern satellite imagery, geodesy, and centuries of direct physical observations.
• Yes: No arguments were made in support of this option.