The constellation is determined by the Gregorian calendar date. The Gregorian calendar date of March 15, 2000 is April 19, and the constellation of that day is Aries.
Lunar calendar: March 15, OO year.
Branch: Ding Wei, Chen Geng, Chen Geng
Gregorian calendar: April 2000/kloc-Wednesday, 0/9, Aries
Source: Hua.com.