[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 129
ing. (Bowd., p. 161.) 129. The amplitude of a star when in the true horizon isits distance from the east or the west point, and is markedN. or S., according as it is north or south of that point. Itis, therefore, the complement of the azimuth. Pkoblem 41. To find the amplitude of a heavenly… … S NM = Z=.90°-i. . Fig.2T. We have cos P M = cos P N cos 1ST M, or sin d = cos L cos Z, whence cos Z — sin A — sin d sec X, (102) as in Bowditch, p. 159. By (102) A is N or S like the de-clination. As the equator intersects the horizon of any place in theeast or west points, it is plain that the…
Navigation · Nautical astronomy
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