[time] A golden number (sometimes capitalized) is a number assigned to each year in sequence to indicate the year`s position in a 19-year Metonic cycle. They are used in the computus (the calculation of the date of Easter) and also in the Runic calendar. The golden number of any Julian or Gregorian calendar year can be calculated by dividin...
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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 ... [1 related articles]
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http://www.britannica.com/eb/a-z/g/45

In chronology, the golden number is a number showing the year of the moon's cycle; so called from having formerly been written in the calendar in gold. To find the golden number add 1 to the given year, and divide the sum by 19, what remains will be the number required, unless 0 remain, in which case 19 is the golden number.
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