It is impossible to understand modern philosophy without considering the scientific revolution. Even after one admits the medieval root of this revolution, it remains the case that a radical reorientation in Western thinking was introduced by Copernicus, developed by Galileo and Descartes, and philosophically explicated by Hume and Kant. My general purpose is to show how Copernicus was a common influence on Hume and Kant. My specific purpose is to show to what extent both Hume and Kant were revolutionary and to what extent they failed to complete the revolution.