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© J R Stockton, ≥ 2006-02-28

Easter by Cycles.

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The Secular Calendar

In the current (Gregorian and ISO 8601) calendar, Day-of-Week, Day-of-Month, Month-of-Year, Week-Number, etc., are all regular or near-regular cycles. Leap Days occur, are omitted, and are restored in regular cycles.

Therefore, one can develop the calendar day-by-day just by keeping track of the cycles.

The Determination of Easter Day

For both Dionysian (Julian) and Gregorian Easter :-

The EFM cycle differs slightly between Julian and Gregorian.

Consequences

Therefore, one can generate the full Calendar by starting on a fixed date, at a known phase of each of the Cycles, and iterating.

Calculation

     
See also my The Date of Easter Sunday,
Date Miscellany I, Date Miscellany II, and
Zeller's Formulae and Papers.
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