Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 317
n the distance is so great that the curvature of theearth cannot be neglected. 328 NAVIGATION Let PCD (Fig. 13) represent a portion of the earths sur-face, P the pole, CA the ships trackbetween C and A, PC and PD themeridians through C and A, CD andBA the parallels through C and A. Let CJ. be… … Fig. 13 Angle PC A = PhA By Plane Trigonometry, gh = Ch sin Cij = hj sin C, Hence,Again, gh + ij H = (Ch + /y H ) sin C. p = D sin C. Cg = CA cos C,hi = hj cos C, (a) .*. Cg + hi-\ = (Ch + hj -\ )cos C. Hence, Ld = D cos C. From (a) and (b), 0>) sin C = -,D cosC = —,D tanC = ^-, p = D sin C,…
Trigonometry · Surveying · Navigation
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