Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 70
commonly used at sea, the altitude being measured by the sextant.The student can deduce the formula for a north zenith-distance. § 9. PARALLAX AND SEMIDIAMETEE. An observation of the apparent position of a heavenlybody can give onJy the directimi in which it Ues from thestation occupied by the… … Fia 18.—^PARALLAX. tion on the earth, P a planet, Z the zenith of S, and theouter arc a part 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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