Provided that you're in the Northern Hemisphere, as you look North you'll see the constellations rotate about Polaris (the North Star) in a counter-clockwise direction. Each 6 hours corresponds to a 90 degree rotation so that in a 24 hour period a given constellation will have made a 360 deg rotation and end up back where it started.
Perhaps the process is better grasped when seen rather than merely explained...this video showcases a software simulation of the night sky and I think Mr. Robinson did a good job of explaining the phenomena. Start the video at 7:00 and watch until 9:00.
Mar 3rd, 2015
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