Barycenter

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The common center of mass that both Earth and Moon revolve around is located inside the Earth about 3/4 of the way from the Earth’s center to its surface.

The common center of mass that the Sun and Jupiter both revolve around is actually located slightly outside of the Sun. Yes, the Sun is much more massive than Jupiter but Jupiter is farther away, moving the center of mass more than if Jupiter were near the Sun.
 
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