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The ancient Greeks decided that the Earth is a sphere, because it always makes a circular shadow on the moon, no matter what time the eclipse is. Only a sphere can cast a shadow like that. The same observation can be made today.
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The ancient Greeks decided that the Earth is a sphere, because it always makes a circular shadow on the moon, no matter what time the eclipse is. Only a sphere can cast a shadow like that. The same observation can be made today.