This letter explains Dionysius Exiguus's method for calculating the date of Easter and the structure of related lunar and solar cycles.
It details the establishment of a 95-year cycle, rooted in earlier traditions and councils, to systematize the determination of the date, emphasizing the importance of this cycle's consistency and the calculation of lunar phases and weekdays.
Dionysius also offers instructions for computing important calendrical aspects such as indictions, epacts, leap years, and the phases of the moon, aiming to ensure accurate and unified ecclesiastical observance of Easter throughout Christendom.
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