Eratosthenes was a scientist and head librarian at the Great Library of Alexandria who accurately calculated the circumference of the earth using only the sun and a couple of sticks.
How did he do it? This video explains:
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Eratosthenes was a scientist and head librarian at the Great Library of Alexandria who accurately calculated the circumference of the earth using only the sun and a couple of sticks.
How did he do it? This video explains: