Page:Early Greek philosophy by John Burnet, 3rd edition, 1920.djvu/80

66 or sideways. The doctrine of innumerable worlds was inconsistent with the existence of an absolute up and down in the universe, so the argument is quite sound. The central position of the earth is due to the δίνη; for the greater masses tend to the centre of an eddy. There is good evidence that Anaximander made the earth share in the rotary movement. It is not, however, a sphere, so we must not speak of an axial revolution. The shape given to the earth by Anaximander is easily explained if we adopt the view that the world is a system of rotating rings. It is just a solid ring in the middle of the vortex.

21. We have seen that the flame which had been forced to the circumference of the vortex was broken up into rings by the pressure of expanding vapour produced by its own heat. I give the statements of Hippolytos and Aetios as to the formation of the heavenly bodies from these rings.