If you set a camera on a stationary mount and record the horizon and the sky for 24 hours, it will look like the sky is revolving around the camera and the horizon from one Sunrise to the next Sunrise.
If, however, you set the camera on a rotating mount that moves at the same speed as the Earth’s rotation (in the opposite direction), it will look like the sky is staying in the same place, and the Earth is the one that’s moving, which is actually what’s happening.
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