Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 358
ex Let PV (Fig. 30) be the perpendicular from P upon thearc of a great circle CC. Then V is the vertex of CC.In the right triangle CVP, sin PV = cos(co. c)cos (co. C).Hence, sin PV = sin c sin C, 1 Latitude of V = 90° - PV. J ^ J (See Spherical Trigonometry, Sect. LI, p. 147.) To find the Longitude…
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