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developed by Aloisius Lilius as an element of the ecclesiastical computations using the Gregorian calendar. The Lilian epact included corrections for the motions of the Sun and the Moon that broke the fixed relationship between the epact and the golden number. The second new epact was a simple adjustment of the practical Julian epact to account for the ten-day change produced by the Gregorian Calendar.

See also

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* Wikisource English translation of the (Latin) 1582 papal bull 'Inter gravissimas' instituting Gregorian calendar reform

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