Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 68
monly used at sea, the altitude being measured by the sextant,The student can deduce the formula for a north zenith-distance. § 12. PARALLAX AND SEMIDIAMETER. An observation of the apparent position of a lieavenlvbody can give only the dwectimi in which it lies from thestation occupied by the… … FlQ, 18.—PARALLAX. tion on the earth, P a planet, Z the zenith of S^ and theouter arc a j^art of the celestial sphere. An observationof the apparent right ascension and declination of P takenfrom the station S will give us an apparent position P\A similar observation at S will give an apparent…
Astronomy
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