Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 172
re 60in each degree. SECTION LXVI THE CELESTIAL SPHERE The Celestial Sphere is an imaginary sphere of indefiniteradius, upon the concavesurface of which all theheavenly bodies appear tobe situated. The Celestial Equator, orEquinoctial, AVBU (Fig.105), is the great circle inwhich the plane of… … 184 SPHERICAL TRIGONOMETRY The Celestial Meridian, PBP (Fig. 106), of an observer is thegreat circle in which the plane of his terrestrial meridianproduced meets the surface of the celestial sphere. Hour Circles, as PMP (Fig. 106), or Circles of Declination, aregreat circles passing through the…
Trigonometry · Surveying · Navigation
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