The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 24
ASTRONOMY. s … circle, MM, situated lialf way lietween the poles of asphere, is called the equator of the sphere. Every great circle of a sphere has two poles. These arethe two points on the sur-face of the sphere which lie ——■—^90° away from the circle.The poles of a sphere arethe poles of its equator. 2. Tlie…
Astronomy
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