The Oxford Companion to the Year: An Exploration of Calendar Customs and Time-Reckoning
Bonnie Blackburn, Leofranc Holford-Strevens. . Oxford University Press, 1999.
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- Reliability
- scholarly
- Kind
- book
- Identifiers
A reference work on calendar customs, calendar reform and time-reckoning, including the Julian and Gregorian rules and the accumulated offset between them.
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- Cross-Quarter Days
- For the Julian and Gregorian leap rules and the accumulated offset between them.