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2:14
Carl Sagan explains how Eratosthenes calculated circumference of the Earth
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How Eratosthenes calculated the Earth's circumference
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How ERATOSTHENES calculated the circumference of the Earth ?
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Eratosthenes: Biography of a Great Thinker
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How Eratosthenes Measured Earth with a Stick.
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The first astronomers begin with Eratosthenes
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