The constellation is determined by the date of the solar calendar. The Gregorian calendar of the lunar calendar 1999 on September 4th is 10+02, and the constellation of that day is Libra.
Lunar calendar: the fourth day of September in the Year of the Rabbit.
Main branches: bazaars add oil.
Gregorian calendar:1999101October 12 Tuesday Libra
Source: Hua Wang.