Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 74
r-increasing precision. Right Ascension and Declination.—It is first necessaryto see clearly how positions on the celestial sphere aredefined. Suppose P tobe the pole, and thatthere is a star at S. Thedistance of the star fromthe pole is measured bythe angle POS, or bywhat is the same thing,the arc… … 64 ASTRONOMY sometimes the equator. PS is called the north polardistance of the star, and SM the declination. If PSis known, SM is obtained by subtracting PS from 900.If S is north of the equator the declination is positive,and if south negative. To know the position of S onthe sphere, besides…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
