Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 42
rth is considered as a correspondingpoint of the celestial sphere. If for a moment we supposeboth spheres at rest, an observer travelling over the earthwould find his zenith to mark out a path on the celestialsphere corresponding to his path on the earth. To un-derstand the relation, we may imagine… … Fig. 10.ZLP = ZOP\ hence 24 ASTRONOMY. At either pole of the earth (s or n), the vertical lineWill extend to the celestial pole, JY P or £ jP, and the
Astronomy
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