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How do star trails affect the Earth's rotation?
Question Date: 2006-02-16
Answer 1:

Star trails do not affect the Earths rotation, but rather appear as a result of the earths rotation. Star trails are features in photographs that are created by taking a picture of the stars from a fixed point for a long time. As the earth rotates, the stars appear to rotate across the sky. By taking a photo with a long-time exposure, the camera tracks the movement of the stars in the sky and the effect is a star trail.

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