Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 32
oint in which the vertical intersectsthe celestial sphere directly below the observers feet.The zenith and nadir are the two poles of the horizon. Vertical planes and circles.—A vertical plane is anyplane which contains the vertical line of the observer,^ny vertical plane, when produced… … Fig. 4. The Visiblt Hemisphere—S N, thehorizon ; Z, the zenith ; S, any star ;S H, its altitude ; M N, its azimuth. A vertical circle may pass through any point on thecelestial sphere. It is then called the vertical circle ofthat point. Hence we may imagine, passing throughevery star, a vertical…
Astronomy
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