epact             447 lib/pengine/rules.c     uint32_t epact, diy, goldn;
epact             453 lib/pengine/rules.c     epact = (11 * goldn + 18) % 30;
epact             454 lib/pengine/rules.c     if ((epact == 25 && goldn > 11) || epact == 24)
epact             455 lib/pengine/rules.c         epact++;
epact             457 lib/pengine/rules.c     return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);