New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 293
theequator, the greater the suns alti-tude at 6 a.m. in summer. At theequator it is 0°. At the north poleit is equal to the suns declination.At a given place, the suns altitudeat 6 a.m. is a maximum on thelongest day of the year, and thensin h = sin I sin e (where e = 23° 27). 15. Given the… … PM = 90° - d.PZ = 90° - IPZM = 90°.By [40],cos ZPM = tan PZ cot PM. cost = tan (90° -I) cot (90° -d)..-. cos t = cot I tan d. The times of bearing due east anddue west are 12 a.m. and — p.m., 15 15 respectively. At St. Petersburg on the longest. day I = 59° 56, d = 23° 27. log cot I = 9.76261log…
Trigonometry · Surveying · Navigation
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