Astronomy in a nutshell, the chief facts and principles explained in popular language for the general reader and for schools (1912)
Serviss, Garrett Putman, 1851-1929, Rouben Mamoulian Collection (Library of Congress) DLC · New York, London, G.P. Putnam's sons · leaf 60
ibed an-other system of circles for determining theplaces of stars, a system based on the horizonand the zenith. This horizon-zenith systemtakes no account of the changes producedby the apparent motion of the heavens,and consequently it is not applicable todetermining the absolute positions of… … Fig. 3. Right Ascension and Declination. The plane of the horizon, with the north, south, east, and west points, and the zenith, are represented as in Fig. 2. P and P are the poles of the celestial sphere, the dotted line connecting them representing the direction of the axis, both of celestial…
Astronomy
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