Editorial note — II. COPERNICUS AND HIS TIMES.
Reading edition
[Footnote 1: History of the German People at the Close of the Middle Ages. By Johannes Janssen Translated from the German by M A Mitchell and A M Christie. Vol I, p. 3.] [Footnote 2: Nikolaus Kopernicus, Der Altmeister der neueren Astronomie, Ein Lebens und Kultur Bild. Von Adolf Muller, S.J.] [Footnote 3: Professor of Astronomy and Physics at the Pontifical Leonine College of Anagni]