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Eratosthenes, The Man Who Measured the Earth  - Koryo Tours

Summary by koryogroup.com
Around 240 BC, a librarian in Alexandria worked out the size of the planet using a stick, a shadow, and an afternoon’s worth of geometry.  The craziest thing? He got it very nearly right.
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koryogroup.comkoryogroup.com

Eratosthenes, The Man Who Measured the Earth  - Koryo Tours

Around 240 BC, a librarian in Alexandria worked out the size of the planet using a stick, a shadow, and an afternoon’s worth of geometry.  The craziest thing? He got it very nearly right.

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koryogroup.com broke the news on Friday, August 7, 2026.
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