Constellations are determined by the date of the solar calendar. 1997 The Gregorian calendar date of the seventh day of the first month is February 13, and the constellation of that day is Aquarius.
Lunar calendar: the seventh day of the first month of Ding Chou's year.
Branches: Ding Chou, Ren Yin and Bing Xu.
Gregorian calendar: 1997 February 13 Thursday Aquarius
Source: Hua.com.