It's Just Common Sense, Right?

Common sense says the world is flat

In 240 BCE, Eratosthenes used math and astronomy to demonstrate the earth is round. Mathematicians and astronomers recognized this truth pretty much ever after, but common knowledge held the earth is flat. Duh. No one had walked west and came back around from the east. Notwithstanding a sailing expedition started by Portuguese navigator Fernão de Magalhães -- and completed by Spanish Basque navigator Juan Sebastián Elcano after de Magalhães's death -- did exactly that, as recently as 2020 a flat earthers' cruise to the ice wall at the edge of earth was planned also notwithstanding the ship's navigation would use GPS which only works because the earth is round.