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(presumed to be the unknown side of the Earth) always facing the Central Fire. The Counter-Earth and the Central Fire were thus never visible from the hemisphere where Greece was located. There is "no explicit statement about the shape of the earth in Philolaus' system", so that he may have believed either that the earth was flat or that it was round and orbited the Central Fire as the Moon orbits Earth--always with one hemisphere facing the Fire and one facing away. A flat Earth facing away from the Central Fire would be consistent with the

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