Re: Movement of the Sun?
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Its motion through the galaxy has been explained already, but there are also local dynamics in play. The Sun doesn't actually sit still at the center of the Solar System: it has its own orbit as well.
In the two body problem, each body orbits the common center of gravity (the barycenter). Jupiter is large enough that the Sun actually orbits a point slightly above its own surface. The Earth makes it wobble a tiny amount too (a few hundred kms I think), as do the other planets, but Jupiter's effect probably accounts for >99% of the Sun's wobble.
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I always laugh when people ridicule ancient people who "knew" the sun goes round earth when today everyone "knows" the earth revolves around the sun.
I mean it seems to me they're both dumb in the same way lol.
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