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-- The earth and moon both orbit their "common center of mass" ... the point

between them where the pivot of the see-saw would have to be in order for

them to balance each other.

-- Since the earth's mass is about 80 times as much as the moon's mass, that

point has to be 80 times farther from the center of the moon than it is from the

center of the earth.

-- The result is that their "common center of mass" is actually inside the earth.

So if you're watching the pair from the outside and you're not measuring too

closely, you'd swear that the moon is going around the earth, and you wouldn't

notice that the earth is also slightly wiggling.

-- By the way ... People often ask "Does the moon orbit the sun or the earth ?"

That "common center of mass" of the earth-moon pair is actually the thing that's

in orbit around the sun, while the earth and moon are both orbiting it.

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