Eratosthenes’ experiment – calculating the circumference of Earth

Eratosthenes' experiment - calculating the circumference of Earth

Using geometry of parallel lines, one can conclude that the distance from Alexandria to Syene must be 7/360 of the total circumference of the Earth. Because there are 360 degrees in a circle. We’re assuming that the Earth is a perfect sphere here – which is not true, but close enough for the purpose. Image: juliantrubin.com

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