Constellations are determined by the date of the solar calendar. 1973 The Gregorian calendar date of the fourth day of the sixth lunar month is July 3rd, and the constellation of that day is Cancer.
Lunar calendar: the fourth day of June in the ugly year.
Dry branch: Chen Geng, the son of Guichou Wugeng.
Gregorian calendar: Tuesday, July 3rd 1973 Cancer.
Source: Hua Wang.