An astronomical calendar made for use in 1521 at Oxford, apparently based on that made in 1263 by Roger Bacon (fol. 4): Preceded by a table for the conversion of degrees into minutes and hours (fol. 1v), and an explanation (fol. 2) Followed by multiplication tables (fol. 17v) And then tables of the equation of days and nights verified for 1456 (fol. 27v) …