Either CS (coordinate system) could be used with equal justification. The two sentences: the sun is at rest and the earth moves, or the sun moves and the earth is at rest, would simply mean two different conventions concerning two different CS
Albert EinsteinI am not a genius, I am just curious. I ask many questions. and when the answer is simple, then God is answering.
Albert EinsteinThe importance of a problem should not be judged by the number of pages devoted to it.
Albert Einstein