Question

Which astronomer first estimated the earth's circumference?

Answer 1

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Eratosthenes calculated the Earth's circumference without leaving Alexandria. He knew that at local noon on the summer solstice in Syene (modern Aswan, Egypt), the Sun was directly overhead. (Syene is at latitude 24°05′ North, near to the Tropic of Cancer, which was 23°42′ North in 100 BC.)

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