The constellation is determined by the date of the solar calendar. The Gregorian calendar date of June 19 in the 70th lunar month is July 2 1, and the constellation of that day is Cancer.
Lunar calendar: June 19th, seven o years.
Branches: Geng Xu, Gui Wei, Ren Yin.
Gregorian calendar: 1970 July 2 1 Tuesday Cancer
Source: Hua.com.