Constellations are determined by the date of the solar calendar. The Gregorian calendar date of the 25th day of the 60th lunar month is July 18, and the constellation of that day is Cancer.
Lunar calendar: June 25th in the Year of the Rat.
Main branch: Gengzi Guiwei
Gregorian calendar: 1960 July 18 Monday Cancer
Source: Hua Wang.