What constellation is 199 1.08.27? Who's the big brother?

If 199 1.08.27 is a solar calendar and belongs to Virgo: August 24th to September 23rd.

If 199 1 year 8.27 is a lunar calendar, then the solar calendar is19911October 4th, belonging to Libra: September 24th-10.

Constellations are calculated according to the solar calendar.