Eratosthenes

More than 2,200 years ago, an ancient Greek scholar calculated the circumference of the Earth using a stick and the sun |

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July 20, 2026

2 Min Read

More than 2,200 years before satellites, GPS and space missions revealed the Earth’s true size, an ancient Greek scholar calculated the Earth’s circumference using only a stick, sunlight and basic geometry. Around 240 BC, Eratosthenes, chief…