Spent 2 yrs checking out claims...definitely not flat. The only 2 possibilities are standard cosmology (preferred by atheists) or geocentric but round. The latter was accepted, as you know, for thousands of years. Forces for Geocentrism are perfectly consistent with what we see & feel. As explained by Professor Mach. The recent finding and confirmation of a cosmic microwave background by 3 probes strongly suggests Big Bang is nonsense & we are towards the centre of the Universe. The film The Principle is a good start. Or Galileo was Wrong on YT.