[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 241
Z, the difference ofthe course and azimuth. Z Z, being small, may be regarded as a right line,Z 71 O as a plane right triangle,and O m, without material error, as equal to Z m; so thatwe shall have Z O = Z Z cos Z Z m71 m = Z m - Z Oor, putting J /i = Z O, J A = c?cos(Cr-Z)) , v A h = d cos (C—Z)… … CIRCLES OF EQUAL ALTITUDE. 235 therefore, be more accurately computed the nearer C—Zapproaches 90°. It is, therefore, better to reduce that alti-tude for which the difference of the course and azimuth isnearest 90°. If the second is the one reduced, then C is the opposite ofthe course. In practice…
Navigation · Nautical astronomy
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