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Many notable mathematicians have developed algorithms for determining the date of Orthodox Pascha over the centuries. This simple and elegant one was devised by the brilliant mathematician Oudin in the 1940s:

''N.B. -- In this formula MOD is the modulo function, in which the first number is divided by the second and only the remainder is returned. Further, all division is integer division, in which remainders are discarded. Thus '' 22 MOD 7 = 1 ''but '' 22/7 = 3.''