The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 23
ut thesection are represented bystraight lines. Thus, in Fig. 2, we have a diagram representingin section the sphere of Fig. i. The straight lines A N, SB,MM, and SA^, represent the corresponding circles of Fig. i. The axis of a sphere is the diameter on which it rotates.The poles of a sphere are… … ASTRONOMY. s
Astronomy
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