Also, I recommend not using Wikipedia or any open-source encyclopedia for controversial topics. These internet encyclopedias are a battle ground. Better to do your own, slow study. Usually, you'll find that there is oh so much more involved that what is represented by a few online editors.
(1) Romish cosmology was influnenced primarily by Greek cosmology in this flat earth issue.
(2) Christianity (if that's what you want to call the Romish church) being wrong once doesn't guarantee Xtianity being wrong again. That's a logical fallacy. Besides, that was an observation of the present universe not a guess about the past.