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Carl Sagan explains how Eratostenes knows the earth is curve

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 Astronomy   |   Physics   |   Science
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Carl Sagan explains how Eratostenes knows the earth is curve.

Extract from: "Cosmos Episode 1: The Shores of the Cosmic Ocean".

Original Video: https://www.youtube.com/watch?v=D_uSLgq0Kt0 thanks to Hernán Gil.

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