# How is it possible to prove the earth revolves around the sun? (Please see description) [duplicate]

Ive only taken physics 101, but I recently became fascinated with Einstein’s theory of general relativity and have watched many YouTube videos on it. My question may be an indication that I completely misunderstand it, however.

Doesn’t the theory of relativity (I think this part predates Einstein) state that if you have two objects in constant velocity, there is no experiment you can do to prove which object is in motion and which object is still? In other words, both prospectives (that you are in motion or you are still) are perfectly legitimate?

So if I claim that the earth is stationary and the universe, along with the sun, is in motion, how can you prove this is not the case?

• There are many equally "correct" ways to describe the world. Some of those descriptions are more convenient for doing some calculations and others are more convenient for doing other calculations. I think you'll find that your proposed description is exceptionally inconvenient for almost any calculation you'll ever want to do. Aug 8 at 21:48
• Most certainly it’s inconvenient. The main reason I ask this question is because some religious folks claim the sun revolves around the earth. So I’m wondering if that can be disproven. Aug 8 at 21:48
• Of course it can't be disproven, because it has no content. It's an aesthetic preference about how to describe things, and is no more susceptible to disproof than "We should paint the bathroom blue". You can, however, point out that the blue will clash with the pink tile, or that the geocentric description will lead to some mighty complicated equations. Aug 8 at 21:51
• Does this answer your question? Why do we say that the Earth moves around the Sun? Aug 8 at 21:52
• @MikeOlson Without invoking special relativity, you just need to track the movements of 3 bodies, or you figure out the mass of the sun with the help of general relativity, by measuring its gravitational pull via bending of light close to its surface. Aug 8 at 22:18