Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 282
N. Required. Required. 142.7 E. 20. 40° 20 N. 41° 37 N. Required. Required. 52.6 W. § 14. Parallel Sailing. Let P (Fig. 9) represent the poleearth, A and B two places on the sameparallel AM, PAE and PBQ meri-dians through A and B interceptingEQ on the equator. Let AD and BBbe perpendicular to PO.… … 20 NAVIGATION. By Geometry, or EQ And AB: P • K = EOR ABR cos L. \d cos L. 1p sec L. J [4] Since p=Xd cos L, Xd is the hypotenuse of the right triangleof which L is an acute angle and p the sideadjacent, as in Fig. 10. Since p = Xa cos L, the meridian distancevaries as the cosine of the latitude.…
Trigonometry · Surveying · Navigation
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