Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 70
. (3.) A yet more restricted parallax is the horizontal PARALLAX. 51 parallax of a heavenly body. The parallax first describedin the last paragraph varies with the position of the ob-server on the surface of the earth, and has its greatestvalue when the body is seen in the horizon of the ob-server,… … Fig. 19.—horizontal parallax. The horizontal parallax depends upon the distance of abody in the following manner: In the triangle GPS,right-angled at S, we have GS = CPsin GPS. If, then, we put p, the radius of the earth GS\ r, the distance of the body P from the centre of theearth ; 7T, the angle…
Astronomy
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