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Is the Moon's orbit shrinking

Updated: 6/30/2023
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15y ago

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No.

Tidal forces resulting from the interaction of the earth and moon are pulling the moon away from the Earth at a rate of about 1/8th of an inch per year.

Thus, the moon is orbiting the Earth about 1 foot further than it was a century ago. The earth is spinning on its axis much faster than the moon is orbiting earth. Both movements are in the same direction, from west to east. Because of the earth's spin, the tidal bulge of the oceans is actually caused to precede the moon a little; the bulge is literally pushed ahead relative to where you would calculate it to be based on tidal force alone. Now the over-all effect this has on the shape and gravity of the earth actually tugs the moon forward, and this tug is working to move the moon's orbit slightly outward.

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15y ago
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15y ago

No. The Moon is about the same size it has been for a very long time.

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