Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 146
he places.Let P be the pole, AB theequator. The arcs MR andNS are the latitudes of theplaces, and the arc RjS, or theangle MPN, is the differenceof their longitudes. Let MR= a, JSTS=b, RS=l; then inthe spherical triangle MNPtwo sides, MP=90-a, NP= 90 — b, and the includedangle MPN=l, are given, and… … Fig. 45. 54) § 63. The Celestial Sphere. The Celestial Sphere is an imaginary sphere of indefiniteradius, upon the concave surface of which all the heavenlybodies appear to be situated. The Celestial Equator, or Equinoctial, is the great circle inwhich the plane of the earths equator produced…
Trigonometry · Surveying · Navigation
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