nal, and circular, or compounded of circular motions'. His only justification for this view is the Aristotelian statement that the motion appropriate to a sphere is rotation in a circle. But, Copernicus went on to say, if the Earth is spherical should we not consider the possibility that it, too, possesses circular motion. After explaining the ancient arguments for a stationary Earth, he refuted them, largely on the ground that if the Earth does not move, the heavens, due to their immense size, would have to rotate at an implausibly fast rate.

Why then do we still hesitate to grant [the earth] the motion appropriate by nature of its form rather than to attribute a movement to the entire universe, whose limit is

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