- The motion of the planets is observable and repeatable. Anyone can look at them and see for themselves.
- Geocentrism (at least certain forms of it) isn't even wrong.
"Ptolemaic system: geocentric, stationary earth. Worked out in great detail by Ptolemy in his Almagest [title from an Arabic translation]. It was surprisingly accurate, as noted. Relativity theory tells us that the choice of frame of reference is arbitrary, so it is no less true mathematically than any other frame."The real irony is that Galileo (the guy who pushed the whole controversy into the forefront) wasn't really right - he supported the Copernican model:
"Copernican system . heliocentric, rotating earth, circular orbits. This system had more epicycles than Ptolemy, and not notably simpler. It produced less accurate results in some cases, partly because it relied on the same inaccurate tables."