Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 141
ion of the earthbeing more rapid than that of an outer planet, it followsthat the apparent motion of the planet through a 5 is morerapid than the real motion of P along the orbit. Hencein this part of the orbit the movement of the planet will beretrograde. In every other part it will be direct,… … Fig. 50. UNEQUAL MOTION OF THE PLANETS. 131 In the case of the inner planets Mercury and Venusthe relation of the epicycle to the true orbit is reversed.Here the epicyclic motion is that of the planet aroundits real orbit—that is, the true orbit of the planet aroundthe sun was itself taken for the…
Astronomy
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