Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 26
the ratio of the circum-ference of a circle to the radius. CIRCLES OF THE SPHERE. 5 Great Circles of the Sphere.—In Fig. 1 let the outlinerepresent that of a sphere, around which are describedthe two great circles A EB F and C E D F. These cir-cles are the lines in which two planes passing through… … Fig. 1.—SECTIONS of a spheke by planes. poles of that circle. The poles are the points in which aline passing through the centre O perpendicular to thej)lane of the circle meets the sphere. They may be con-sidered as representing this line. The angle B P, or A C, equal to the greatest distanceof…
Astronomy
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-128-0.webp)
