New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 294
f d > J, the sun is north of theprime vertical the entire day. If I > d, the diurnal circle of thesun and the prime vertical of theplace meet in two points, whichseparate farther and farther as Iincreases, the distance between themapproaching 180° - 23° 27 as Iapproaches 90°. At the pole… … ZM = 90° - h.PM = 90° - d.PZ = 90° - I Since the sun M bears due east,MZP is a right angle.By [38],cos PM = cos PZ cos MZ.cos(90°-d) = cos(90o-0cos(90°-/i)..-. sin d = sin I sin h.sin I = sin d esc h. 18. At a point O in a horizontalplane MN a staff OA is fixed sothat its angle of inclination A…
Trigonometry · Surveying · Navigation
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