chinese_new_moon_before
int m2_prev = chinese_new_moon_before(m2);
int m11_next = chinese_new_moon_before(s2 + 1);
int m = chinese_new_moon_before(rd + 1);
int m_prev = chinese_new_moon_before(m);
int m11_next = chinese_new_moon_before(s2 + 1);
rd_begin = chinese_new_moon_before(Options.day_begin);