New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 164
s360 2tt x 3962.864800° x 360° 3962.8 it log 64800 = 4.81158colog 3962.8 = 6.40200 - 10colog it = 9.50285- 10logdist. =0.71643Distance sailed = 5.2051° = 5° 12 18.Chord of arc sailed ■ =2 x 3962.8sin2°36/9//= 7925.6 sin 2° 36 9.log 7925.6 = 3.89903log sin 2° 36 9 = 8.65712log chord = 2.56615Chord =… … In rt. A ODA, A 4 02)=90°-lat.Hence, DA OA The A DAB and OEQ are similar.Therefore, : sin (90° -lat.) = coslat. DA AB _AB DA _ OE ~ EQ °r ~OA ~ ~EQ AB Substituting, cos lat. = EQTherefore, A 7? EQ = = ABx sec lat. cos lat. That is, Din\ long. = depart, x sec lat. 117. A ship in latitude 42° 16N.,…
Trigonometry · Surveying · Navigation
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