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How to Prove That the Earth Goes Around the Sun
Most of my students, graduate students, can prove that the earth is round or explain how. And much harder is to prove that the Earth goes around the sun. In fact, that's extremely hard to prove. So there are many ways to do it. You could take a spaceship, park it at the north celestial pole of our solar system and just watch what happens. That wasn't how it was discovered in the late 1700s. It's called aberration. We have to correct for that effect when we measure the cosmic microwave background.