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CASE #HSWWQE · 1 entities · 0 connections
Flat Earth Theory
A Greek scholar calculated Earth's circumference to within a few percent of the actual figure over 2,200 years ago using nothing but shadows and geometry — and a modern movement has grown online insisting he, and everyone since, got it completely wrong.
Flat Earth theory holds that Earth is a flat disc rather than a sphere, a claim scientifically settled since antiquity but experiencing a significant modern resurgence through internet communities and social media. Ancient Greek scholar Eratosthenes accurately calculated Earth's spherical circumference around 240 BC, and the planet's shape has been independently confirmed by centuries of subsequent astronomy, physics, and direct observation, including spaceflight.
✕debunked
Quick facts
- →Ancient Greek scholar Eratosthenes calculated Earth's circumference around 240 BC using shadow angles measured in two different cities, arriving at a figure within a few percent of the modern accepted measurement.
- →Earth's spherical shape has since been independently confirmed through centuries of astronomical observation, ship navigation, satellite imagery, and direct human spaceflight photography.
- →Modern Flat Earth belief experienced a significant resurgence beginning in the mid-2010s, driven substantially by social media and video-sharing platforms rather than any new scientific evidence.
- →Every specific claimed piece of Flat Earth "evidence" proposed by modern proponents has been directly and repeatedly addressed by physicists and other scientists using standard, well-established principles of optics, gravity, and geometry.
Entities on file
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Eratosthenes (person)
Ancient Greek scholar who accurately calculated Earth's spherical circumference around 240 BC using shadow angle geometry.
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