Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 179
distance,Z ZPM its hour angle. SECTION LXVITI E m p -M- -Ms \ \ \\ W D Fig. 115 THE ASTRONOMICAL TRIANGLE The triangle ZPM (Fig. Ill) is often called the astronom-ical triangle, on account of its importance in problems inNautical Astronomy. The side PZ is equal to the complement of the latitude… … and the angle POZ is the complement of ZOB. Since the arcNP is the complement of PZ, the altitude of the elevated poleis equal to the latitude of the place of observation. The triangle ZPM then (however much it may vary inshape for different positions of the star M) always containsthe following…
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