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dominical letter

calendar cycle

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calculation of Dionysian period

  • In Dionysian period

    …the same date) and of dominical letters—i.e., correspondences between days of the week and of the month, which recur every 28 years in the same order. The product of 19 and 28 is the interval in years (532) between recurrences of a given phase of the Moon on the same…

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development of Gregorian calendar

use in perpetual calendar

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    Metonic cycle

    golden number, in chronology, the position of a solar, or calendar, year within the 19-year Metonic cycle (q.v.) after which the phases of the Moon recur on the same dates. The sequence of golden numbers, used in fixing the date of Easter, begins at one at each year in which the New Moon occurs on January 1 (e.g., 1995 and 2014).

    This article was most recently revised and updated by William L. Hosch.