The constellation is determined by the date of the solar calendar. On April 12, 2004, the Gregorian calendar date is May 30th, and the constellation of that day is Gemini.
Lunar calendar: April 12th, four o years.
Branches and Branches: Shen Jia did his own thing.
Gregorian calendar: Sunday, May 30, 2004 Gemini
Source: Hua.com.