Sorry Goldstein, but you don't know enough about the history of globularism. Your argument suffers as a result. Globularism was first invented by the professional Greek wrestler, Plato, in around 400 BC.
Circumnavigation has never played a role in proving the Earth to be a globe - it couldn't (look at a map of the Flat Earth) - and the misconception that, to quote the famous nursery rhyme, "People still thought the world was flat, can you even imagine that?" is addressed in Christine Garwood's FE:HoaIA. If you want to talk Flat Earth history, I recommend you buy it, there's a link at the top of every forum page.
Some people, throughout history, have clung to the Ancient Greek delusion of a spherical Earth since its inception.