Page:Astronomy for Everybody.djvu/51

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CIRCLES OF CELESTIAL SPHERE
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We have the same system in the heavens. Circles are imagined to pass from one celestial pole to the other in every direction, but all intersecting the equator at right

Fig. 3.—Circles of the Celestial Sphere.

angles, as shown in Figure 3. These are called hour circles. One of them is called the first hour circle, and is so marked in the figure. It passes through the vernal

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