Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 66
TRONOMICAL OBSERVATIONS. Latitude from circumpolar stars.—In Fig. 16 let Z represent thezenith of the place of observation, P the pole, and HPZ R the me-ridian, the observer being at the centre of the sphere. Suppose-Sand IS to be the two pointsat which a circumpolar starcrosses the meridian in the… … Fig. 16. which serves to determine <j>. The distances Z imd Z can b< 48 ASTRONOMY. ured by the meridian circle or the sextant—both of which instru-ments are described in the next chapter—and the latitude is thenknown. Z and Z must be freed from the effects of refraction. Inthis method no…
Astronomy
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