In the preface to his work On the Revolutions of the Heavenly Spheres Copernicus explains the genesis of his geokinetic and heliocentric theory. He mainly concentrates on the justification for the introduction of the concept of Earth's movement into astronomic science. The movement of Earth contradicts all articulations of knowledge, be they »scientific« (as in philosophy or teology) or »unscientific« (sensus communis). The author argues that Copernicus' dedication to Pope Paul III is the result of the fact that Copernicus realized that he had to step out of science and try to garner the support of the unscientific instance which controled the politics of science if he wanted to succeed in introducing »the new and absurd« concept of Earth's...