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