Nicholas Copernicus’ Revolutions
Thus far to the best of my ability I have discussed the earth’s revolution around the sun [Book III], and the moon’s revolution around the earth [Book IV]. Now I tackle the motions of the five planets. The order and size of their spheres are connected with remarkable agreement and precise symmetry by the earth’s motion, as I indicated generally in Book I [ch. 9], when I showed that the centers of these spheres are not near the earth, but rather near the sun. It therefore remains for me to prove all these statements one at a time and more clearly, and to fulfill my promises as well as I can. In particular I shall utilize observations of phenomena, which I have taken not only from antiquity but also from our own times, and by which the theory of those motions is made more certain.
KeywordsApparent Motion Uniform Motion Outer Planet Complete Revolution Lower Apse
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