> I believe that for calculation by simple souls Easter is just the first
> Sunday after the first full moon after the equinox of 21 March. But I
> would like to find Easter several years ahead and do not know where to
> find lunar phases except for the current year. Or is there a handy
> table somewhere. There is one in the Oxford Companion to English
> Literature, extending over hundreds of years but it ends at the year
> 2000. Can anyone help, please?
> --
> Frank Evans
Here is a C implementation of Meeus's Easter algorithm
#include <stdio.h>
#include <stdlib.h>
/* Credit to Jean Meeus. */
main(int argc, char *argv[])
{
int year, a, b, c, d, e, f, g, h, i, k, l, m, n, p;
if ( argc != 2 )
{
fprintf(stderr, "Usage: %s year\n", argv[0]);
exit(1);
}
year = atoi(argv[1]);
a = year % 19;
b = year / 100;
c = year % 100;
d = b / 4;
e = b % 4;
f = (b + 8) / 25;
g = (b - f + 1) / 3;
h = (19 * a + b - d - g + 15) % 30;
i = c / 4;
k = c % 4;
l = (32 + 2 * e + 2 * i -h -k) % 7;
m = (a + 11 * h + 22 * l) / 451;
n = (h + l - 7 * m + 114) / 31;
p = (h + l - 7 * m + 114) % 31;
printf("Easter %d is %s %d.\n", year, n == 3 ? "March" : "April", p + 1);
}
