I do not know how relevant this is, but it appears to be useful, sometimes.
NB. from http://dev.whydomath.org/Reading_Room_Material/ian_stewart/2000_03.html EasterSunday =: 3 : 0 NB. y is year(s) A=. 19 | y 'B C'=. 100 (<....@%~ ,: |) y 'D E'=. 4 (<....@%~ ,: |) B G=. <. 25 %~ 13 + 8 * B H=. 30 | 15 + B + (19*A) - D + G 'J K'=. 4 (<....@%~ ,: |) C M=. <. (A + 11 * H) % 319 L=. 7 | 32 + M + (2 * E + J) - H + K N=. <. (90 + H + L - M) % 25 P=. 32 | 19 + H + L + N - M |:y,N,:P ) EasterSunday 2000 + i.10 2000 4 23 2001 4 15 2002 3 31 2003 4 20 2004 4 11 2005 3 27 2006 4 16 2007 4 8 2008 3 23 2009 4 12 EasterSunday 1000000 NB. from Ian Stewart 1000000 4 16 >From the link above " Under the rules of the Gregorian calendar, the cycle of Easter dates repeats exactly after 5,700,000 years." R.E. Boss ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
