... beyond those parts by the star of the south, the which star appeareth not to us. And this star that is toward the north, that we clepe the Lode-star, ne appeareth not to them. For which cause men may well perceive, that the land and the sea be of round shape and form; for the part of the firmament sheweth in one country that sheweth not in another country. And men may well prove by experience and subtle compassment of wit, that if a man found passages by ships that would ... — The Travels of Sir John Mandeville • Author Unknown