A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 97
lear : Let E E (Fig. 61) represent the equator, and e e the ecfiptic, A the firstdegree of Aries, or vernal equinox; a b the amount of force exerted todraw the equator*toward the ecliptic in a given time, and ad the amountof rotation performed in that time. By the principle of resultant motion,the… … diagonal a c, thus changing the direction of the equator from E E to g hand causing the point of intersection to recede from A to A. It will beobvious that the angle of inclination at A must be very nearly equal tothat at A. d. Obliquity of the Ecliptic Variable.—There is a very slow dimi-nution of…
Astronomy
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