[Half-hours with the Telescope by Richard A. Proctor]@TWC D-Link book
Half-hours with the Telescope

CHAPTER II
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CHAPTER II.
A HALF-HOUR WITH ORION, LEPUS TAURUS, ETC.
Any of the half-hours here assigned to the constellation-seasons may be taken first, and the rest in seasonal or cyclic order.

The following introductory remarks are applicable to each:-- If we stand on an open space, on any clear night, we see above us the celestial dome spangled with stars, apparently fixed in position.

But after a little time it becomes clear that these orbs are slowly shifting their position.

Those near the eastern horizon are rising, those near the western setting.

Careful and continuous observation would show that the stars are all moving in the same way, precisely, as they would if they were fixed to the concave surface of a vast hollow sphere, and this sphere rotated about an axis.


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