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In what century was the earth discovered to be round?

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In Ancient Greece. The mathematician Eratosthenes found out that the earth wasn't round by placing two markers on a flat field and looking from the first one to find that he couldn't see the second one which he should have seen if the Earth was flat. Then he became the first person to calculate the circumference.

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During the Renaissance I believe.

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In 1492, Columbus sailed the ocean blue.

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The ancient Greeks knew the earth was round.

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