Constellations are determined by the date of the solar calendar. 1February 29th, 993, the Gregorian calendar date is February 20th1year, and the constellation of that day is Aries.
Lunar calendar: February 29th, Year of the Rooster.
Branches and Branches: Gui You, Yi Mao, Xin Chou
Gregorian calendar:1March 2, 9931Sunday Aries
Source: Hua Wang.