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
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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.