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 95
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- … 84 THE SEASONS. [§ 12^ tains the direction of its axis invariable, unless disturbed bysome outside force (very prettily illustrated by the gyro-scope). Fig. 14 shows the way in which the north pole ofthe earth is tipped with reference to the sun at differentseasons of the year. At the vernal…
Astronomy
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