In Sphaeram Ioannis De Sacro Bosco Commentarius

21.0 x 15.0cms, 394pp, early vellum binding with spine lettering in gilt, title page with large woodcut astronomical diagram, numerous woodcut diagrams & mathematical illustrations & tables throughout, text in Latin. Contemporary or near-contemporary marginal annotations in Latin appear throughout including numerical additions made to tables demonstrating careful early study and use. Title page moderately foxed & browned with old ink marks, occasional marginal dampstaining & scattered foxing, several leaves lightly toned, binding slightly bowed & soiled with minor wear, internally sound and complete. Provenance: Bookplate of noted historian of astronomy & leading scholar of Copernicus and early modern scientific texts, Owen Gingerich, to front pastedown.