A = X Mod 19 ' Moon parameter D = ( 19 * A + M ) Mod 30 ' Seed for 1st full Moon in spring R = D \ 29 + ( D \ 28 - D \ 29 ) * ( A \ 11 ) ' Calendarian correction quantity OG = 21 + D - R ' Easter limit SZ = 7 - ( X + X \ 4 + S ) Mod 7 ' 1st sunday in March
Seed for 1st full Moon in spring R = D \ 29 + ( D \ 28 - D \ 29 ) * ( A \ 11 )