Is the constellation based on the birthday on the ID card?

Not necessarily. Constellations were introduced into China from the west, and the Gregorian calendar is an international calendar, so constellations are calculated according to the Gregorian calendar. Citizenship number is a unique and life-long identity code for every citizen, which is compiled by public security organs according to the national standard of citizenship number. The ID card records the name, gender, nationality, date of birth, permanent residence address, citizenship number, personal photo, fingerprint information, validity period of the certificate and issuing authority. 1996 65438+ 10 1 China began to use birth medical certificates. The birth date certificate issued by the hospital is Gregorian calendar, and all legally binding documents are Gregorian calendar certificates. Therefore, the date of birth on the ID card is generally in the Gregorian calendar. However, as the date in China is also the lunar calendar, before 1996, some citizens registered their ID cards on the lunar calendar. When the birth date on the ID card is the Gregorian calendar date, the constellation is also calculated according to the birthday on the ID card; When the date on the ID card is the date of the lunar calendar, the constellation is not calculated according to the birthday on the ID card, but according to the Gregorian calendar date corresponding to the lunar calendar.