Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 63
nastronomical language, considered as negative. Instead of the co-ordinate we have described, another called zenithor polar distance is frequently employed. The fundamental circle is * The co-ordinates of a body are those meaaurei, whether of angles or lines, whichdefine its position. For instance,… … everywhere 90° from its positive pole, P. Hence, if A is the position of a star or other point on thesphere, and we put d, its declination or altitude,=^aA. p, its polar or zenith distance=PA, we shall have i +p= 90°,or, p = 90°—<i. If the star is south of thefundamental circle, at B for…
Astronomy
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