This volume contains critical editions of all of Copernicuss minor mathematical and scientific works with commentaries and German translations. Taking into account the latest developments in Copernicus research it includes the "Commentariolus", the "Wapowski-letter on the movement of the eighth sphere", the "Notebook in Uppsala" with Copernicuss astronomical observations, the "Trigonometry", the "Table of sunrises and sunsets" and, for the first time, all the mathematical and scientific notes Copernicus wrote in books of his library. Furthermore Johannes Werners "Treatise on the movement of the eighth sphere" was critically edited and translated into German for the first time since the Editio princeps in 1522.