Ethan again:In the face of this unsuccessful confrontation with the data, what do you think Kepler did? He continued to promote his Mysterium Cosmographicum we even though it was clear ellipses fit the data better. His move to Prague was to gain access to Tycho’s data, which he needed to fine tune his cosmology. Kepler didn’t abandon his Mysterium Cosmographicum for his elliptical astronomy but rather built his elliptical astronomy into his Mysterium Cosmographicum. Finally, his grand central claim that Kepler abandoned the Mysterium Cosmographicum to develop his elliptical astronomy is one hundred percent ahistorical hogwash.