Table of Contents

Introduction
1: The Julian calendar and the problem of the equinoxes in the early Middle Ages
2: The ecclesiastical lunar calendar and its critics, 300-1100
3: Calendrical astronomy in the Twelfth-Century Renaissance
4: The consolidation of a calendar reform debate in the thirteenth century
5: Astronomers and the calendar, 1290-1500
6: The papal reform project of 1344/45 and its protagonists
7: Church councils and the question of Easter in the fifteenth century
8: The harvest of medieval calendar reform
References

About the Author

C. Philipp E. Nothaft studied modern history, ancient history, and philosophy at the University of Munich, leaving with a PhD in modern history in 2011. He has since held positions at the Hebrew University, Jerusalem, at University College London, and at the Warburg Institute (University of London). He is currently a post-doctoral research fellow at All Souls College, Oxford. His past publications include three books and about forty articles, most of them revolving
around the history of calendars, chronology, and astronomy in medieval and early modern Europe.

Reviews

Nothaft's main achievement is to demonstrate the staggering variety of approaches and rich texture of medieval conversations around the technical problems of the calendar. The thirty black-and-white illustrations give the merest hint of the masses of unedited mathematical manuscripts through which the author has sifted.
*Speculum*

This essential volume reworks the well-established framework of medieval computus, providing a richer understanding of the place of the calendar in medieval astronomy. It belongs in every library that collects in medieval history or the history of science.
*Stephen McCluskey, Journal of the History of Astronomy *