It is very important to know the year of birth of a person in order to get information about him/her from the Catalog of human population. It is important to know the year for one reason only: to understand whether it is a leap year or a common year. Since in most cases if two people were born on the same day, but one of them was born in a common year and the other was born in a leap years, then they are representatives of different human subtypes. Therefore, they have different individual (subtype) programs and manipulations modes. In this case, they have completely different qualities, characteristics and functions, they lead different lifestyles.
Of course, coincidences do happen because the ancient treatise Shan Hai Jing contains 293 descriptions of human programs and, as it is known, there are 365 days in a year. However, in order to use this information, it is necessary to know exactly which programs are reproduced multiples times.
Therefore, without having knowledge of the exact year of birth of the person of interest—accurate information from the Catalog of human population about this person cannot be obtained. However, this is not a problem because in the modern world it is very easy to get information about when a person was born. Usually, it does not even cross a person’s mind to hide this kind of information about himself. Also, it is easy to find it in public records, profiles in social networks, documents, forms, and so on.