Constellations are determined by the date of the solar calendar. Lunar calendar1April 29th, 969, the Gregorian calendar date is1June 3rd, and the constellation of that day is Gemini.
Lunar calendar: April 29th, 69.
Main branch: I lost my life in Gengwu.
Gregorian calendar:1June, 9691Friday, 3rd Gemini
Source: Hua.com.