Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 94
arth itself is also continually being slightly disturbed in itsorbit. On account of its connection with the moon, it oscil-lates each month a few hundred miles above and below thetrue plane of the ecliptic, and by the action of the otherplanets is sometimes set backwards or forwards in its orbit… … Vernal EquinoxFig. 14.— The Seasons 123. The Seasons. — The earth in its motion around the sunalways keeps its axis nearly parallel to itself during the wholeyear, for the mechanical reason that a spinning globe main-
Astronomy
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