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A golden number (sometimes capitalized) is a number assigned to each year in sequence which is used to indicate the dates of all the calendric new moons for each year in a 19-year Metonic cycle. They are used in computus (the calculation of the date of Easter) and also in .
The golden number of any Julian calendar or Gregorian calendar year can be calculated by dividing the year by nineteen, taking the remainder and adding one. Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac (London: Her Majesty's Stationery Office, 1961), pp. 421-422. (In mathematics this can be expressed as (( year number Modulo operation 19) + 1).
For example, 2025 divided by 19 gives , remainder , which after adding 1 gives the golden number .
The golden number, as it was later called, first appears in a calendar composed by Abbo of Fleury around the year 1000. Around 1162 a certain Master William referred to this number as the golden number "because it is more precious than the other numbers." The name refers to the practice of printing golden numbers in gold. (2025). 9780141985541 ISBN 9780141985541 The term became widely known and used, in part through the computistic poem Massa Compoti written by Alexander de Villa Dei around 1200.
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