What is the constellation of 15 in April, 79?

According to the general language habit, you should say the date of the lunar calendar.

Constellations are determined by the date of the solar calendar. The Gregorian calendar date of April 1979 in the lunar calendar is May 10, and the constellation of that day is Taurus.

Lunar calendar: April 15th.

Gregorian calendar:1May, 979 10 Thursday Taurus

Source: Hua.com.