Any of the seven letters A-G used in Church calendars to indicate the date (1-7 January) on which the first Sunday in the year falls, and hence in dating movable feasts.
- Combining this value with a table of Sunday or dominical letters, Easter could be derived without calculation.
- However, he does not specify the years to which the dominical letters in his calendar refer.
- Use the epact and dominical letter for any year to look up the date of Easter in the table.
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