The constellation is determined by the date of the solar calendar. The date of August 16 1999 in the Gregorian calendar is1Saturday, September 25th, 999. The constellation of that day is Libra.
Lunar calendar: August 2008 16.
Main branch: Bazaar Chen Geng, Gui You.
Gregorian calendar:1Saturday, September 25th, 999 Libra
Source of information: Central China Moon Network