• As funny as this sounds, the stars are always out. It's just that during the day, the sun is so bright it drowns out all other light sources. Also, the rotation of the earth has a great deal to do with the "movement" of the stars. The stars themselves don't move in the sky; it's the earth that's actually in motion. If you look at an exposure of the night sky, you'll see that all the stars (with the exception of Polaris, the North Star) seem to be spinning. This is caused by the rotation of the earth. If the stars are in a certain part of the sky, they may move through the night, but the angle is right so that they never actually sink below the horizon.

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