ocr: Leonardo again brings his expertise to bear on the problem of the body of the earth. He discussés the changing center of1 the earth's gravity due to-its uneven density. This analysis is largely based on Jean Buridan' 'S question of "whether the worldis always at rest at the center of the universe, as Aristotle had maintained.Leonardos thinking developed In a unique direction, and he concludes that the natural processes of the elevation and depression of land are analogous to the geometric transformation of one shape into another of equal volume.
