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The Easter Computus and the Origins of the Christian Era$
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Alden A. Mosshammer

Print publication date: 2008

Print ISBN-13: 9780199543120

Published to Oxford Scholarship Online: January 2009

DOI: 10.1093/acprof:oso/9780199543120.001.0001

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The Computistical Rules

The Computistical Rules

(p.97) 6 The Computistical Rules
The Easter Computus and the Origins of the Christian Era

Alden A. Mosshammer

Oxford University Press

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 Dionysius, with the possible exception of the seventh rule. In his examples, Dionysius uses what he calls the present year—the consulship of Probus, AD 525. The rules are clearly of Alexandrian origin. Dionysius has adapted them to the Roman calendar, but some of them are explicable only as formulae based on the Alexandrian calendar.

Keywords:   Dionysius Exiguus, argumenta, consulship of Probus, Alexandrian calendar, computus

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