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johnnyOnTheSpot | 8 years ago

Given people have always known the earth is round based on the shadow it casts on the Moon...

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saghm|8 years ago

EDITED: Obviously not trying to argue that the Earth is flat, but flat things can still cast round shadows if they're, well, round

(ORIGINAL: Obviously not trying to argue that the Earth is flat, but there are round things that are also flat)

Kenji|8 years ago

A disk will also cast a round shadow in some cases.