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2.12.3. What is the Golden Number?




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This article is from the Calendars FAQ, by Claus Tondering claus@tondering.dk with numerous contributions by others.

2.12.3. What is the Golden Number?

Each year is associated with a Golden Number.

Considering that the relationship between the moon's phases and the
days of the year repeats itself every 19 years (as described in
section 1), it is natural to associate a number between 1 and 19
with each year. This number is the so-called Golden Number. It is
calculated thus:
GoldenNumber = (year mod 19)+1

In years which have the same Golden Number, the new moon will fall on
(approximately) the same date. The Golden Number is sufficient to
calculate the Paschal full moon in the Julian calendar.

 

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