Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 61
of the sphere, wi:h hishead toward the positive pole P,the positive direction should befrom right to left around thesphere. When the horizon istaken as the fundamental circleor plane, this secondary co-ordi-nate is called the azimuth, andshould be counted from the southpoint toward east, or from… … THEORY OF THE SPHERE. 43 The hour angle of a star is measured by the interval which haselapsed, or the angle through which the earth has revolved on itsaxis, since the star crossed the meridian. In Fig. 13 Z being thezenith and P the pole, the angle Z P 8 is the hour angle of the star8. This angle…
Astronomy
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