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REVOLUTION OF THE STARS
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stars within the circle ST will never rise above the level of the platform at all, and will remain invisible to us.

To our eyes the celestial sphere is such a globe as this, of infinite dimensions. It seems to us to be continually

Fig. 1.—The Celestial Sphere as it appears to us.

revolving round a certain point in the sky as a pivot, making one revolution in nearly a day, and carrying the sun, moon, and stars with it. The stars preserve their relative positions as if fastened to the revolving celestial sphere. That is to say, if we take a photograph of them

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