About 2200 years ago, Eratosthenes, a Greek librarian in Alexandria, Egypt, determined the Earth's circumference – and in doing so proved the curvature of the Earth – using 'sticks, eyes, feet.... plus a zest for experiments'. Carl Sagan, eminent cosmologist and humanist, at his finest. 👇 | Humanists UK
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About 2200 years ago, Eratosthenes, a Greek librarian in …
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This measurement is more than 2,200 years old, and its accuracy is remarkable
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