Constellations are determined by the date of the solar calendar. 1982 Lunar June 10 Gregorian calendar date is July 30th (not July 20th), and the constellation of that day is Leo.
Lunar calendar: the tenth day of June in the year of the dog.
Main branch: Ren Xuding Wei Jiayin
Gregorian calendar:1Friday, July 30th, 982 Leo.
Source: Hua.com.