What is the constellation on the fourth day of March?

The constellation is looking at the solar calendar. The solar calendar corresponding to the fourth day of the third lunar month in the year when you were born is your constellation.

Libra 1/2 1 ~ 2/ 18 Leo July 23rd to August 23rd.

Pisces 2/ 19 ~ 3/20 Virgo 8/24 ~ 9/22

Aries 3/2 1 ~ 4/20 Libra 9/23 ~ 10/23

Taurus 4/2 1 ~ 5/2 1 Scorpio10/24 ~1/22.

Gemini 5/22 ~ 6/2 1 Sagittarius11/23 ~121

Cancer 6/22 ~ 7/22 Capricorn 12/22 ~ 1/20