This is caused by the revolution of Earth on it's axis. As the Earth orbits the sun, the planet is constantly in a different spot at night, causing the position of stars to move at night in relation to us humans. It might appear that over time the stars are circling around Polaris, or the North Star, but in reality this phenomenon is solely because the North Star is directly overhead Earth.
Hope this helped, thanks!
Jan 28th, 2015
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