This is not a good example, as it is simply a matter of reference. Seeing as why do not to know the entire bounds of the universe it is possible that the Earth is at the center of gravity. In that case the Sun would in fact revolve around the Earth. The fact that we say the Earth revolves around the Sun makes the math easier for us from a astrological point of view.
No.
Makes all the rocket burn calculations for space probes to comets work out real neat too....