I am under the impression that the earth orbiting the sun is really a matter of perspective and we can actually take a perspective in which the earth is stationary and the sun and everything else move in relation to it. And we can take any perspective we want but we just have to use fictional forces etc. I am under the understanding that the earth orbits the sun no more then the sun orbits the earth. And I'm not talking about a Barycentre, that would be a third perspective, none of which is more true than the other. Is this wrong?