That’s interesting. What does that mean?
Ben Wolford

Well, the Earth doesn’t really revolve around the Sun in a way that the Sun could NOT be said to revolve around the Earth. When Newtonian absolute motion is out of the picture, Copernicus and Galileo become more about the fact that the planets move in a neatly regular pattern relative to the Sun, as opposed to their rather erratic movement relative to the Earth. Still, in Einsteinian terms, it’s valid to say the Sun revolves around each of those planets if you pick them in turn as reference frames.

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