Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 180
is noon; if the hour angle is 15°, thetime of day is 1 oclock p.m. ; if the hour angle is 75°, thetime of day is 5 oclock p.m. ; if the hour angle is — 15°,the time of day is 11 oclock a.m. ; if the hour angle is — 75°,the time of day is 7 oclock a.m. ; and so on. In general, if t denotes the… … Given the latitude of the observer and the altitude and theazimuth of a star, to find its declination and its hour angle. In the triangle ZPM (Fig. 117),given PZ = 90° - I = the co-latitude,ZM = 90° - h = the co-altitude,Z PZM = a = the azimuth ; to find PM = 90° — d — the polar distance,Z ZPM — t…
Trigonometry · Surveying · Navigation
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