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It would mess with the tides. Other than that, not a whole lot. It's difficult to see how this could happen, unless one of them was a captured asteroid and very small, in which case it probably wouldn't even affect the tides much.

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12y ago
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14y ago

The Earth's rotation does have an impact on the moon's orbit, so if the Earth were spinning in the opposite direction it would have an effect upon the moon. This is a very small effect that adds up over very long periods of time, so there wouldn't immediately be a spectacular change. Currently, the rotation of the Earth is slowing (about 17 microseconds per year) and the moon is getting further away (about 38 millimeters per year) as the Earth's angular momentum is transferred to the moon by tidal forces. You can see that it would take a while to produce a noticeable difference.

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12y ago

Then the phases would be backward. Other than that, essentially no impact (unless you live near the ocean and really, really care about the timing of tides, in which case you'd discover they were shifting the other way ... since most people have no idea which way they shift now, this would affect a small minority at most).

Actually, the question is worded in a way that's vague enough to imply that it might mean that the moon's orbit was unchanged but the rotation about its axis was backward. There are very good reasons this couldn't happen (for that matter, there are pretty good reasons that the orbit being backward is extremely unlikely), but if it did, then we'd get to see both sides of the moon ... not at the same time, of course.

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15y ago

The phases of the moon refer to the amount of sunlight hitting the moon, as seen from the Earth. That wouldn't change if the moon revolved around the Earth the other way.

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Q: How would the moon phases change if the moon revolved around earth in the opposite direction?
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