Constellations are determined by the date of the solar calendar. The solar calendar date on March 13 of the lunar calendar in 2004 is May 1 day, and the constellation of that day is Taurus.
Lunar calendar: Shen Jianian March 13.
Branch: Chen Geng, Chen Wu, Shen Jia
Gregorian calendar: May 2004 1 Saturday Taurus
Source: Hua.com.