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Eratosthenes of Cyrene was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. His work is comparable to what is now known as the study of geography, and he introduced some of the terminology still used today.

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Jeniferlynn Johnson

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2y ago
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14y ago

His name was lost to antiquity. Certainly the Greeks knew the world was round by 400 BCE, by that time they had measured the distance to the moon in earth radii. The trouble was, they did not know the circumference of the earth. Eratosthenes the Greek worked this out around 250 BCE from documents at the Library in Alexandria, on the coast of Egypt, which mentioned a well on the Tropic of Cancer in southern Egypt with curious properties on the summer solstice.

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11y ago

Eratosthenes

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Q: Who was the Egyptian greek scientist who proved the earth was round?
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