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Lilian (Gregorian) epacts

When the Gregorian calendar reform was instituted in 1582, the lunar cycle previously used with the Julian calendar to complete the calculation of Easter dates was adjusted also, in accordance with a (modification of the) scheme devised by Aloysius Lilius.There were two adjustments to the old lunar cycle:
* a "solar equation", decrementing the epact by 1, whenever the Gregorian calendar drops a leap

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