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No, it proves it is a sphere because if proves the moon is in orbit around us. Well, one of the many proofs. Anyway, the moon is in orbit because of gravity. So the earth has a great bit of gravity. And something the size of the moon has to be a sphere because a sphere is the most compact geometric shape. The force of gravity predicts this and is shown to hold true of all bodies over a certain mass. Gravity crushes the object into a compact sphere. So the moon is smaller than the earth, therefore the earth must also be a sphere for the same reason...only more so.

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