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Scandalous ErrorCalendar Reform and Calendrical Astronomy in Medieval Europe$
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C. Philipp E. Nothaft

Print publication date: 2018

Print ISBN-13: 9780198799559

Published to Oxford Scholarship Online: March 2018

DOI: 10.1093/oso/9780198799559.001.0001

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Church Councils and the Question of Easter in the Fifteenth Century

Church Councils and the Question of Easter in the Fifteenth Century

(p.235) 7 Church Councils and the Question of Easter in the Fifteenth Century
Scandalous Error

C. Philipp E. Nothaft

Oxford University Press

This chapter begins with an account of the calendar-reform initiative spearheaded in 1411–17 by Cardinal Pierre d’Ailly at the Councils of Rome and Constance, followed by an in-depth look at the repeated efforts towards a new calendrical legislation made at the Council of Basel in the years 1434–40, which saw the matter debated by a specially created commission or task force. The final part continues the story into the second half of the fifteenth century, highlighting in particular the role of print technology in the dissemination of calendrical and astronomical knowledge. Special attention is given to the activities of the astronomer Johannes Regiomontanus, whose premature death in 1476 prevented him from assisting Pope Sixtus IV in preparing a reform of the ecclesiastical calendar.

Keywords:   calendar reform, medieval astronomy, Council of Constance, Council of Basel, Pierre d’Ailly, Johannes Regiomontanus, Nicholas of Cusa, Hermann Zoest, Pedro de Osma

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