Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 84
e to place on the Earth his zenith moves on thecelestial sphere. It is the point directly over his head. DIURNAL MOTION IN 34° NORTH LATITUDE. 63 His horizon is the plane always perpendicular to the linejoining his zenith and nadir. As this line moves with themotion of the observer his horizon must… … Fig. 37.The circles of a celestial sphere for an observer in north latitude PNor CZ. The student must pay particular attention to this figure. When he understands just what it means he has mas-tered all the more important theorems of spherical astron-omy. The large circle stands for the celestial…
Astronomy
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