Only when his housekeeper and companion Anna Schilling, banned by the bishop, and the Vorarlberg mathematician Georg Joachim Rheticus persuade Copernicus, Copernicus decides to publish. His work „On the Circular Motions of the Heavenly Bodies“ is printed shortly before his death. Although it is banned by the Catholic Church for over 200 years, it is the beginning of the Copernican turn and the foundation of modern astronomy. The trail leads from Coperni- cus via Johannes Keppler and Isaac Newton to the James Webb telescope.