Now imagine yourself on the Moon's surface exactly in the center of its disk as seen from Earth. Since the same side of the Moon always faces us, you would see the Earth directly overhead at all times. There would be no Earth rise or Earth set. If you were at another point on the hemisphere of the Moon facing Earth, the Earth would be somewhere other than overhead but would still not move across the sky. If you were on the side opposite Earth you would never see it, just as we never see the far side of the Moon from Earth. One interesting exception to the above description would be for anyone exactly on the limb (edge of the Moon's disk as seen from Earth). The Moon "wobbles" or "nutate" over time in its orbit, so we can actually see slightly more than 50% of its surface over time. That mean someone at the limb could see the Earth just at the horizon, occasionally rising and setting briefly.
Answered by: Paul Walorski, B.A., Part-time Physics/Astronomy Instructor
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