The constellation is determined by the Gregorian calendar date. 1972 The Gregorian calendar date of the 20th day of the first month is March 5th, and the constellation of that day is Pisces.
Lunar calendar: 20th day of the first month in 72.
Main branch: Ren Zi Ren Wei
Gregorian calendar:1March 5, 972, Sunday, Pisces.
Source: Hua.com.