. "known" . "proof the Earth is round" . . . "erroneously" . "believed the Earth was flat" . "although that was common knowledge of the day" . "Earth was flat" . "myth of the flat Earth" . "a popular misconception" . . "Myth of the flat Earth" . . . "baseless notions that before Columbus and Magellan, the world was thought to be flat and that the Earth\u2019s sphericity was officially opposed by the Church" . "the Earth was generally believed to be flat until a few hundred years ago" . "Myth of the flat Earth" . "flat-Earth myth" . "still believed the earth was flat" . "sailing off the edge of the world" .