Gaussian Formulae

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Year indicates the year of interest (AD). The formulae: a = Year mod 4 b = Year mod 7 c = Year mod 19 d = (19c + 15) mod 30 e = (2a + 4b - d + 34) mod 7 f = Int((d + e + 114) / 31) g = ((d + e + 114) mod 31) + 1

f is the month of Pascha. g is the day of Pascha. For example, if f is 3 and g is 27, then Pascha occurs on March 27.


Source: Hieromonk Cassian, A Scientific Examination of the Orthodox Church Calendar Programs using these formulae: Menologion

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