Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 45
OMT. poiut. But, since tlie earth itself is considered as Imt apoint in comparison with the celestial sphere, the rationaland sensible horizons are considered as one and the samecircle on this sphere. The celestial poles are the extremities of the axis of thecelestial sphere Pp, the north pole… … Fig. 9.—cniCLES op the sphere. that one whose plane passes through the centre of thesphere being tlie celestial equator, or the equinoctialC WD. The celestial equator is then that parallel of declinationwhich is a great circle of the celestial sphere. Tlie figure illustrates the phenomena which…
Astronomy
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