The first comprehensive study on the history of calendar reform and calendrical astronomy in medieval Europe, this volume draws on a range of sources over a period of more than 1600 years, from the Julian calendar of 46/45 BC to the Gregorian calendar reform of 1582, to shed new light on the place of astronomy in medieval intellectual culture
The Julian calendar and the problem of the equinoxes in the early Middle Ages -- The ecclesiastical lunar calendar and its critics, 300-1100 -- Calendrical astronomy in the twelfth century -- The consolidation of a calendar-reform debate in the thirteenth century -- Astronomers and the calendar, 1290-1500 -- The papal reform project of 1344/5 and its protagonists -- Church councils and the question of Easter in the fifteenth century -- The harvest of medieval calendar reform