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OCR: which he defines as being "separated equally from the opposite extremities of the body that encloses it, whether it be uniform or not." Like a "ball of any material," this kind of gravity is defined only by its location at the geometric center of the world. B The second kind is natural gravity. If the "machine of the earth" C were perfectly spherical and contained equal amounts of water and earthen material, the center of natural gravity would coincide with the geometric center. (This kind of gravity, in modern terms, corresponds to a body's