It is an artificial rule, that is to say, it is the year, month, day, and time of birth. It mainly means that girls have bad marriages, and the year, month, day, and hour are not. As we usually say, the year is bounded by the beginning of spring, the month is divided into seasons, and the day is at eleven o'clock. Anyway, there are many people who are not professionals and can't understand it. If you want to know, please add qq1114551606