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The Computistical Rules

Alden A. Mosshammer

in The Easter Computus and the Origins of the Christian Era

Published in print:
2008
Published Online:
January 2009
ISBN:
9780199543120
eISBN:
9780191720062
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199543120.003.0006
Subject:
Religion, History of Christianity, Early Christian Studies

Dionysius Exiguus appended to his 95‐year table a set of rules (argumenta) for working with the data. Of the sixteen rules included in the manuscripts, only the first ten derive genuinely from ... More


Scandalous Error: Calendar Reform and Calendrical Astronomy in Medieval Europe

C. Philipp E. Nothaft

Published in print:
2018
Published Online:
March 2018
ISBN:
9780198799559
eISBN:
9780191839818
Item type:
book
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198799559.001.0001
Subject:
History, European Medieval History

The Gregorian calendar reform of 1582, which provides the basis for the present-day Western civil calendar, has often been portrayed as a triumph of early modern scientific culture and an expression ... More


Introduction

C. Philipp E. Nothaft

in Scandalous Error: Calendar Reform and Calendrical Astronomy in Medieval Europe

Published in print:
2018
Published Online:
March 2018
ISBN:
9780198799559
eISBN:
9780191839818
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198799559.003.0001
Subject:
History, European Medieval History

The introduction to this book sets the stage with some framing remarks on the significance of computus in the context of medieval culture and on the ‘calendar problem’ as confronted by medieval ... More


The Ecclesiastical Lunar Calendar and Its Critics, 300–1100

C. Philipp E. Nothaft

in Scandalous Error: Calendar Reform and Calendrical Astronomy in Medieval Europe

Published in print:
2018
Published Online:
March 2018
ISBN:
9780198799559
eISBN:
9780191839818
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198799559.003.0003
Subject:
History, European Medieval History

This chapter begins with a succinct account of the development of lunar cycles for the purpose of Easter reckoning in late antiquity and the controversies these cycles generated up to the end of the ... More


The Consolidation of a Calendar-Reform Debate in the Thirteenth Century

C. Philipp E. Nothaft

in Scandalous Error: Calendar Reform and Calendrical Astronomy in Medieval Europe

Published in print:
2018
Published Online:
March 2018
ISBN:
9780198799559
eISBN:
9780191839818
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198799559.003.0005
Subject:
History, European Medieval History

This chapter follows the story of calendar reform from the end of the twelfth to the end of the thirteenth century, showing how during this period the problem was popularized via two different ... More


The Papal Reform Project of 1344/5 and Its Protagonists

C. Philipp E. Nothaft

in Scandalous Error: Calendar Reform and Calendrical Astronomy in Medieval Europe

Published in print:
2018
Published Online:
March 2018
ISBN:
9780198799559
eISBN:
9780191839818
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198799559.003.0007
Subject:
History, European Medieval History

This chapter focuses on the first serious effort made within the medieval Latin Church to correct the calculation of Easter by legislative means. This effort took place at the court of Pope Clement ... More


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