[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 265
itude only is to be found, the Greenwichmean times of the observations are wanted only with suffi-cient exactness for finding the right ascensions and declina-tions of the bodies. If the longitude is also to be found, itis necessary to note the times by a Greenwich chronometer,or a watch compared… … h — 90°—Z M, the true altitudeof M, h! = 90°—Z M, the true altitudeof M, d = 90°—P M, the decimationof M, d=90°—P M, the declinationof M, r=ZPM, the hour-angle of M, f = ZP M, « M;, t == T-T= M P M, the differ-ence of the hour-angles. £ is positive in the direction of the diurnal rotation, andwill…
Navigation · Nautical astronomy
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