Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 48
gyratory motion, like thehandle of a spinning-top which has begun to wabble a little.This gyratory motion causes the axis of the heavens todescribe a cone in about twenty-six thousand years, and thepole of the heavens to describe a circle about the pole ofthe ecliptic in the same time. The radius… … Fig. 36. 2 2 ASTRONOMY. the ecliptic; the oblique ring E Q represents the equator:V and A represent the equinoctial point, and E and C thesolstitial points: B represents the pole of the ecliptic, P thepole of the equator, and P O the celestial axis. The ring E Qis supported on a pivot at Oj and the…
Astronomy
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