Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 266
onception of the angles q) and A,pass a sphere around 0 as a centre, and mark on its surfacethe points and lines in which the lines and planes belongingto the preceding figure intersect it. Then 242 GEOMETRY OF THREE DIMENSIONS. The fundamental plane OXQ intersects the spherical sur-face in the… … If now we imagine this sphere to be the earth, the greatcircle XP to be its equator, Z to be one of the poles, and Pany point on its surface, then The arc QP or the angle QOP is the latitude of P; The arc XQ or angle XOQ is the longitude of P, countedfrom ZX as a prime meridian. Thus the angles we…
Geometry, Analytic
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