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The sun appears to move 15 degrees in a one hour. However, it is really the Earth that rotates 15 degrees an hour, relative to the sun.
15 degrees. (This is APPARENT motion only. The Earth is revolving. The Earth takes 24 hours to revolve 360 degrees.) 360 degrees/24 hours x 1 hour = 15 degrees

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Why do stars appear to move through the sky at the rate of 15 degrees per hour?

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