Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 285
and A. It is shown in plane sailing thatp is.less than CD and greater thanDA. It is nearly equal to EF,and exactly equal to an intercepta little nearer to the pole thanEF. Hence, Dm = J(i+Z), nearly,if both places are on the same side of the equator. In middle latitude sailing p is first found as… … p = Xd cos LmBy plane sailing, p = D sin C, p sec Lr tanC=-f-. [5] MIDDLE LATITUDE SAILING. 23 Hence, by combining,tanO K cos LmD sin 0 sec L„ [6] [7] The formula Lm= J(X-f-B) may be used without sensibleerror in low latitudes when the course is not less than about45°, and both places are on the…
Trigonometry · Surveying · Navigation
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