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Birthday horoscope, referred to as horoscope, refers to the date of birth of a person according to the stem and branch calendar; year, month, day, hour, four stems and branches, each column has two characters, totaling eight characters, so it is called. Birthday horoscopes play an important role in Han folk beliefs, and ancient Han astrologers used them to predict a person's destiny. The expressions of the horoscope include the four pillars of the sun law, the four pillars of the moon law, or the four pillars of the sun law and the moon law. To get the correct time of birth, the ancient Han people believed that it was most accurate to measure with a sundial during the day. Clock time is artificial mean time and regional standard time. The "true solar time difference" must be calculated based on solar terms (solar longitude) and the "local longitude time difference" based on the place of birth to obtain the true astronomical time of birth.