Constellations are determined by the date of the solar calendar. 1June 3, 963 The Gregorian calendar date is July 23, and the constellation of that day is Leo.
Lunar calendar: June 3, 63.
Main branch: Guimao hasn't arrived in Dingmao yet.
Gregorian calendar: Tuesday, July 23rd, 1963 Leo.
Source: Hua.com.