Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 208
n is always direct also. Theplane of the Earths orbit—the ecliptic—is the plane in MOTIONS OF THE PLANETS. 187 which all the other planets revolve very nearly. It is tothe slower motion of the outer planets that the occasionalapparent retrograde motion of the planets is due, as maybe seen by… … Fig. 123. The apparent motion of a superior planet, as seen from the Earth, issometimes direct and sometimes retrograde. The motion is always retro-grade when the planet is nearest the Earth, always direct when theplanet is farthest from the Earth. to intersect the celestial sphere, the apparent…
Astronomy
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