From net news message

According to H.V. Smith in "Mathematical Spectrum," 11 (1978/79), 23-24, the following rule appeared in Butcher's Ecclesiastical Calendar, 1876. To find the date of Easter Sunday for year y: Divide by Quotient Remainder --------------------------------------------------- y 19 j y 100 k h k 4 m n k + 8 25 p k - p + 1 3 q 19j + k - m - q + 15 30 r h 4 s u 32 + 2n + 2s - r - u 7 v j + 11r + 22v 451 w r + v - 7w + 114 31 x z Here x is the number of the month ond 1 + z is the day of that month upon which Easter Sunday falls in the year y.