getNineStar method
Implementation
NineStar getNineStar() {
int index = LunarUtil.getJiaZiIndex(getGanZhi()) + 1;
int yuan = ((_year + 2696) / 60).floor() % 3;
int offset = (62 + yuan * 3 - index) % 9;
if (0 == offset) {
offset = 9;
}
return NineStar.fromIndex(offset - 1);
}