Reading the Night Sky · Unit 1 · Lesson 1
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The sky is a spinning dome
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Stand still for an hour and the whole sky quietly slides past you.
Through the night the stars appear to drift from east to west. But they aren’t moving — you are. Earth spins west-to-east once a day, and that turning makes the whole sky look like it’s wheeling overhead.
Why do the stars appear to move across the sky each night?