The Date of Orthodox Easter: An Algorithm Due to Gauss

RMD(x,y) = remainder when x is divided by y.
R1=RMD(Year,19)
R2=RMD(Year,4)
R3=RMD(Year,7)
RA=19*R1+16
R4=RMD(RA,30)
RB=2*R2+4*R3+6*R4
R5=RMD(RB,7)
RC=R4+R5

The number RC ranges from 1 to 35 which corresponds to March 22 to April 25 in the Julian Calendar (currently April 4 to May 8 on the Gregorian). The Julian Calendar is now 13 days behind the Gregorian, and will be until March 1, 2100 when it will be 14 days behind the Gregorian Calendar.

( See Frequently Asked Questions about Calendars by Claus Tondering for more information about Easter calculation and calendars. )

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