Constellations are determined by the date of the solar calendar. 1997 February Gregorian calendar date is March 25th, and the constellation of that day is Aries.
Lunar calendar:1February 997 17.
Branch: Ding Chou Gui Mao Bing Yin
Gregorian calendar:1Tuesday, March 25th, 997 Aries.
Source: Hua.com.