Question

Why do the Sun, Moon, and stars appear to move in the sky

Answer 1

It's because the earth is moving/revolving and rotating.Thus relative motion is the motion u observe when u look into the sky.That's why they appear moving

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Answer 2

This motion is due to the earth's rotation. As the spin of the earth carries us eastward at almost one thousand miles per hour, we see stars rising in the east ,passing overhead ,and setting in the west. The sun and planets appear to move accross the sky much like the stars.