Sphaera mundi / Theoricae novae planetarum / Disputationes contra Cremonensia in planetarum theoricas deliramenta praefatio
This is a Venice incunable printed by Erhard Ratdolt, gathering three astronomy texts: Sacrobosco's Sphaera mundi, Georg von Peurbach's Theoricae novae planetarum, and Regiomontanus's attack on Cremonensis's planetary theories, written for scholars and students of astronomy in the late fifteenth century. The pictures are woodcut diagrams of concentric deferent circles, epicycles and eccentrics drawn in simple black line, some with hand-coloured rings and handwritten annotations, offering a designer clean geometric schemes for orbit and cosmic motif work.
