You have two very high poles at two places separated by a distance on the surface of the earth. Can you conclude that the earth is round using this setup? Please describe how? Can you think of a method to nd the radius of the earth by observing their shadows
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800 km
Eratosthenes knew the distance between Alexandria and Syene (which is about 800 km). He determined the angle between the tower (in Alexandria) and the edge of its shadow — 7.2 degrees.
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Go throgh the attachment
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