Each of us has our own birthday, that is to say, all the time corresponds to the time of birth. In ancient times, it was generally believed that a person's fate had a lot to do with his date of birth, because there was a theory of reincarnation in ancient times, and the date of birth represented his life. Therefore, the ancients also believed that this birth theory can not only predict the fate of a person's life, but also look at the birth dates of both parties in marriage mate selection. There is a saying about the theory of birthdays that "men ride big horses for 38, and women keep big widows for 38."