Plural of epact; multiple instances of the numerical days added to align solar and lunar calendars.
Simple plural form of 'epact' with the standard '-s' suffix. Used when discussing multiple year values in a calendar cycle.
A 19-year Metonic cycle contains 19 different epacts—ancient astronomers discovered that lunar and solar calendars realign perfectly every 19 years, which is why the same Easter dates repeat on a roughly 19-year schedule.
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