Astronomy.- Regiomontanus (Johannes Müller) Kalendarium, 25ff. (of 26, lacking final blank) plus 2ff. woodcut diagrams at end, printed in red and black including 30 diagrams of eclipses, woodcut initials, the 4 full-page woodcuts of astronomical instruments at end pasted together and mounted later to form 2 stiff cards, one with 2 ?later volvelles, woodcuts defective and missing portions supplied in facsimile, some lower corners of text leaves repaired, early ink annotations in red, some soiling and staining, modern buckram, 4to (199 x 138mm.), Augsburg, Erhard Ratdolt, 1499.*** The last incunable edition of Regiomontanus' Latin calendar, first published in 1474. Collates the same as the copy in the Bayerische Staatsbibliothek but the middle woodcut initial on b7r is different and the upper volvelle has a different central decoration (the latter suggesting the volvelles might both be later additions to this copy).Provenance: Gilbert R. Redgrave (1844-1941, bibliographer and co-editor of STC, bookplate and his extensive notes on endpapers regarding this and other editions.Literature: Goff R100; Hain 13783*; BMC II 389; ISTC ir00100000.