"The Map of the Qing Palace" adopts the algorithm of nominal age, because in ancient times, China people paid great attention to filial piety and respected their mothers. When my mother was pregnant for ten months, she counted these ten months in the womb as her age, in order to thank her for the pain she had suffered in these ten months.
Extended data
The prediction object of the comparison table of boys and girls in the palace is mainly women, which is calculated according to the age and pregnancy month of women. Because the comparison table is made according to the laws of ancient heavenly stems and earthly branches, traditional calculation methods are needed in calculation. For example, the age should be the date of birth of a woman plus 9 months of imaginary years in the lunar calendar, and the month of pregnancy should be based on the lunar month. ?
Its origin is Zhouyi, which is calculated according to the formula of Yin and Yang five lines of gossip. It has a history of about 300 years and is in charge of eunuchs in various dynasties. In this table, 1~ 12 represents the month of pregnancy, 18~ 100 represents the female age, and the information exchange table for boys and girls is calculated according to the nominal age.