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They found the diameter of the Earth by measuring the angle of the Sun above the horizon at noon at two different places, Alexandria and Aswan. The 7 degree difference gave the Earth's circumference as 360/7 times the distance between those two cities.

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Audra Weissnat

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3y ago

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They found the diameter of the Earth by measuring the angle of the Sun above the horizon at noon at two different places, Alexandria and Aswan. The 7 degree difference gave the Earth's circumference as 360/7 times the distance between those two cities.


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