Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 24
nutes, and seconds, respectively, in the cir-cumference, by 2 X 3-14:159265, the ratio of the circum-ference of a circle to the radius. PLANES AND CIRCLES OF A SPHERE. o Planes and Circles of a Sphere.—Let Fig. 1 representthe outline of a sphere, of which 0 is the centre. Imaginea plane ^ ^ to pass… … Fig. 1.—sections op a sphere by planes. Through 0 let a straight line P 0 P he passed per-pendicular to the plane. The points P and P\ in whichit intersects the surface of the sphere, are everywhere 90°from the circle A E B F, They are called poles of thatcircle. Imagine another plane C E D F^ to…
Astronomy
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