Constellations are determined by the date of the solar calendar. On July 10, 2004, the Gregorian calendar date is August 25th, and the constellation of that day is Virgo.
Lunar calendar: the tenth day of July, o four years.
Main branch: Shen Jia Ren Shenbingzi.
Gregorian calendar: Wednesday, August 25th, 2004, Virgo.
Source: Hua.com.