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Calculating the circumference of the Earth in 200 BC

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 Society / Culture   |   Geometry   |   Physics   |   Math   |   Science   |   Social Science
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In one of the dopest displays of critical thinking in history, Eratosthenes estimated the circumference of the Earth. All he had was a pole, the sun, knowledge of a famous well in Egypt, and potentially money to pay someone to walk the distance between two cities. This story demonstrates the beauty of trigonometry.

Main source and further reading: https://www.khanacademy.org/partner-content/big-history-project/solar-system-and-earth/knowing-solar-system-earth/a/eratosthenes-of-cyrene

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