The constellation is determined by the Gregorian calendar date. 1The Gregorian calendar date of February 20th, 994 is March 3rd1,and the constellation of that day is Aries.
Lunar calendar: February 20th, JOE.
Main branch: Jia Mao Bingchen
Gregorian calendar:1March 3, 9941Thursday Aries
Source: Hua.com.