I know that describing the trajectory of all planets in the solar system around the Earth is much more complicated than if we take the Sun as the reference point. But besides this, what is the simplest experiment that can prove that the Sun is a more "inertial" point of reference than the Earth? Do we have to look at the stars in the background or something like that?
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How do we know the Earth translatesorbits around the Sun and not the other way around?
How do we know the Earth translates around the Sun and not the other way around?