Eratosthenes gauged the circumference of the earth by, Physics

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Eratosthenes gauged the circumference of the earth by

Eratosthenes gauged the circumference of the Earth by noting that the Sun is at an angle of 7° south of the vertical in Alexandria at the same time of day and year that it is directly overhead in Syene, 400 km directly south of Alexandria. Discover the circumference of the Earth from these data.

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