"We all agree on the earth’s shape. For surely we always speak of the round ball of the Earth" - Pliny (Natural History, II.64). In year 77.
If the earth was commonly spoken of in day to day language as the round ball, than i would assume this meant that even commoners knew that it was round.
If the earth was commonly spoken of in day to day language as the round ball, than i would assume this meant that even commoners knew that it was round.