Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 178
tuated. The right-ascensions and declinations of thesestars are known (or if they are not known they can bedetermined by observation). APPARENT MOTION OF THE SUN. 157 It is plain that an observer on the San would see theEarth projected at points on the celestial sphere exactlyopposite to the… … Fig. 98.—The Revolution of the Earth in its Orbit about the Sun. among the stars in consequence. The two motions mustaccurately correspond one with the other. The apparentmotion of the Sun in the heavens is a precise measure ofthe real motion of the Earth in its orbit. The radius-vector of the…
Astronomy
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