Constellations are determined by the date of the solar calendar. On the 28th day of the twelfth lunar month, the Gregorian calendar date is 199 1 February 12, and the constellation of that day is Aquarius.
Lunar calendar: Xin Weinian? December? twenty-eight
Main branch: Xin Wei? Gengyin? Guichou
Gregorian calendar: 199 1 February1Tuesday Aquarius
Source of information: Central China Moon Network