The argument when Columbus sailed was NOT, absolutely 100% NOT EVER - if the world was flat or round. That is absolute historic ignorance.
Educated people in the time of Columbus KNEW the world was round - the argument was over - HOW FAR AROUND IS IT?
The scholars of his day used the (accurate) figure of Eratosthenes - and accurately predicted that Columbus would NEVER make it to India with the ships and provisions he had.
And Columbus would have never made it to India- even if there was a clear naval passage straight through America - but he did have (barely) enough to make it to the West Indies.
Good job. You beat me — although I think only because I posted to the other copy of the thread, which got pulled :-)
You’re both right. The earth’s spherical shape was known well into antiquity, even the approximate size. Obama is a “flat-earther” if anyone is, because he thinks socialism works despite ample evidence to the contrary.