Date of birth, abbreviated as eight characters, refers to the calendar date when a person is born; Year, month, day, * * * four columns, each column has two words, and * * * eight words. Birthday plays an important role in Chinese folk beliefs, and ancient numerologists calculated people's fate according to birthdays. Birth horoscope is a method to predict a person's marriage, career and fortune, as well as the good or bad luck of a lifetime by using a person's date of birth.