Book 11
10
Again, a sensible body is in some region, and the region of the whole and of the part (e.g. of the earth) is the same.i.e., the region of the universe which is proper to a given element is proper also to any part of that element. The proper region of earth is the center, of fire the circumference of the universe. Cf. Aristot. De Caelo 1.2. Therefore if the infinite body is homogeneous, it will be immovable or will always be in motionRoss is evidently right in taking this to refer to the rest or motion of the parts. An infinite body cannot move as a whole, because there is no space outside it.; but this is impossible, for why should there be rest or motion below rather than above or in any other region? E.g., if there were a clod, in what region would it move or be at rest?
