Constellations are determined by the date of the solar calendar. 1July 997, the Gregorian calendar date is1August 8, and the constellation of that day is Leo.
Lunar calendar: July 16 of the Year of the Ox.
Branches: Ding Chou, Wu Shen, Ren Chen
Gregorian calendar: 1997 August 18 Monday Leo
Source: Hua Wang.