ABSTRACT
The controversy between Copernicus and the supporters of the traditional conception of the Universe is very curious. From the point of view of an Aristotelian, his criticisms—basically, there is only one— do not carry weight, any more than do his replies to the old objections of Aristotelism against the Earth's motion. All the same, they are extremely important; they contain the germ of those which Galileo was to formulate at a later date on a totally fresh basis.
