Hello! Constellations are divided according to the solar calendar (also called Gregorian calendar and new calendar). I checked the perpetual calendar for you. The solar calendar of the date you mentioned is-1972-05-11Thursday.
1 1
March 28
Year of the rat
On the fourth day of the second month, I will stay in the dark.
The constellation is Taurus: April 2 1 ~ May 21.