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Brianna is correct. And you can have students demonstrate this. Have one student stand and represent the earth. Another student stands near by and represents the moon. If the moon-student moves around the sun always facing the same direction, i.e., always facing the same wall, then by the time the moon-student gets halfway around, the student will have her/his back to the earth. In order to keep the same side toward the earth, the moon-student must slowly rotate as (s)he moves around the earth. And that's what the moon does, completing one rotation for each revolution.
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