The constellation is determined by the date of the solar calendar. The Gregorian calendar date on May 26th of the lunar calendar is July 7th, and the constellation of that day is Cancer.
Lunar calendar: May 26th, 9 1 year.
Main branch: Wuyin, Wu Jia, Xin Wei.
Gregorian calendar:1991July 7th Sunday Cancer.
Source: Hua.com.