Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 61
the sphere, wi fch 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 the… … THEORY OF TUB 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 R the i)ole, the angle Z P H is the hour angle of the star8. This angle…
Astronomy
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