[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 121
ch can-not be obviated. 116. In the problems which are here discussed the follow-ing notation will be employed :— L z= the latitude of the place of observation ;h = the true altitude of a celestial body ;z = 90°— A, its zenith distance ;d = its declination ;^ = its polar distance ;t =: its… … P, the elevated pole, or thatwhose name is the same asthat of the latitude ; M, the position of a celestialbody; Z M H, a vertical circle ; andP M, a declination-circle, throughM. Then, in the spherical triangle Fig. 22. P M Z, PZ = 90°—X, the co-latitude of the place ; P M = p — 90°— d, the polar…
Navigation · Nautical astronomy
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