3. What constellation is15? Introduction of birth constellation 3. 15.

The signs of the Gregorian calendar in March 1 and 15 are Pisces (date of birth: 19, February-March 20th).

2. This constellation has a messier objects: M74, which is located near the second right of the brightest star in Pisces. On the celestial sphere, there are two intersections between the ecliptic and the celestial equator. The intersection formed by the intersection of the ecliptic from the south of the celestial equator from west to east and the north of the celestial equator is called the "vernal equinox" in astronomy, which is of great significance in astronomy. At present, this important "spring equinox" is in Pisces. In the ancient tradition of China, the sky area of Pisces includes the thunderbolt star, the sex star and the rain star, the underground palace in the wall, the outer horizon star and the right Geng star in the building.