Questio de aqua et terra (74)

(74) Sed nunc queritur: Cum illa regio celi circulariter feratur, quare illa elevatio non fuit circularis? Et respondeo quod ideo non fuit circularis, quia materia non sufficiebat ad tantam elevationem. (74) But now the question arises: Since that region of heaven is borne round us in a circle, why was not the corresponding elevation circular? I answer that it was not circular, because there was not sufficient matter for so great an elevation.