Why would a massive sun orbit a tiny Earth? It doesn't. Flip the relative proportions of the two bodies: a tiny sun orbits a massive Earth. For this we use Matty’s Constant.
April 17th
April 8th
Understanding relative motion is the power to comprehend that heliocentric and Geocentrospheric models coexist. The Geocentrospheric model is empirical. The heliocentric model is theoretical.