Method getMonthNineStar

src/main/java/com/nlf/calendar/Lunar.java:2098–2106

(int yearZhiIndex, int monthZhiIndex)

  }

  protected NineStar getMonthNineStar(int yearZhiIndex, int monthZhiIndex) {
    int index = yearZhiIndex % 3;
    int n = 27 - index * 3;
    if (monthZhiIndex < LunarUtil.BASE_MONTH_ZHI_INDEX) {
      n -= 3;
    }
    int offset = (n - monthZhiIndex) % 9;
    return NineStar.fromIndex(offset);
  }

  /**
   * 获取值月九星（流派2新的一月以节交接当天零点起算。月紫白星歌诀：子午卯酉八白起，寅申巳亥二黑求，辰戌丑未五黄中。）