The Earth in Space a Manual of Astronomical Geography
The Earth in Space a Manual of Astronomical Geography
Edward Payson Jackson
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THE EARTH'S DAILY MOTION. 33 around the north pole, only in the opposite direction ; stars farther off describe larger circles, those over the equator describing the largest of all. 67. How to observe the Apparent Rotation of the Heavens. Most persons know where to look among Fig. 13. Apparent Daily Motion of the Heavens. the stars for the " Dipper. " It is represented in Fig. 13, ABD. The two stars A and B are called "point- ers, " because they seem to point to the pole star P. 34 THE EARTH'S ...DAILY MOTION. The circles in the figure show the apparent revolution of the stars, or the rotation of the celestial sphere in the direction of the arrows, from east to west. Now, on some clear evening carefully observe the relative positions of the Dipper and some other cluster, as Cassiopeia, M, which resembles an irregular W in form. The book can easily be held so that the stars in the figure shall correspond in position with those in the sky. Observe also the positions of certain bright stars overhead and near the eastern and western hori- zon.
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