It is only a “stupid question” to someone without an answer.
I have an answer at the ready that explains the observation, all you have is trying to desperately hide behind “coordinate system”.
The fact is that there are FORCES at work, not just motion, but FORCES that explain that motion.
No force except for magical forces can explain your model, that is why you seem so apoplectic that I would DARE to ask such a simple and basic question.
“What force is capable of moving the massive Sun around a much less massive Earth while leaving the Earth motionless?”
Nope, a stupid question is a stupid question. The reason you ask it is because you can't understand the quotes I posted.
"I have an answer at the ready that explains the observation, all you have is trying to desperately hide behind “coordinate system”."
I just posted the answers. Particularly this one. You do exactly what George Ellis warns about.
"People need to be aware that there is a range of models that could explain the observations,” Ellis argues. “For instance, I can construct you a spherically symmetrical universe with Earth at its center, and you cannot disprove it based on observations.” Ellis has published a paper on this. “You can only exclude it on philosophical grounds. In my view there is absolutely nothing wrong in that. What I want to bring into the open is the fact that we are using philosophical criteria in choosing our models. A lot of cosmology tries to hide that.”
Ellis, George, in Scientific American, "Thinking Globally, Acting Universally", October 1995
"The fact is that there are FORCES at work, not just motion, but FORCES that explain that motion."
Again, there is no physically-significant difference between a heliocentric solar-system and a geocentric universe according to Einstein, Hoyle, Born and Ellis.
"No force except for magical forces can explain your model, that is why you seem so apoplectic that I would DARE to ask such a simple and basic question."
You just keep demonstrating that you simply can't understand what has been posted in the statements by Einstein, Hoyle, Born and Ellis.
“What force is capable of moving the massive Sun around a much less massive Earth while leaving the Earth motionless?”
Keep going, no need to stop now...