What is the constellation of 1990 on March 22nd?

There are so many constellations in the sky, why do we usually only say twelve constellations? To understand this, we must first understand this.

Celestial sphere is an imaginary sphere with the same center of the earth, the same axis of rotation and infinite radius in astronomy and navigation. All objects in the sky can be regarded as objects projected on the celestial sphere. The equator and geographical pole of the earth are projected on the celestial sphere, which is the celestial equator and celestial pole. Celestial sphere is a very practical tool in positional astronomy.

The ecliptic, an astronomical term, refers to the route that the sun "walks" from the earth within one year, which is produced by the earth's revolution around the sun. Moreover, the orbit of the moon around the earth (that is, the "white road") and the orbit of the planets around the sun are very close to the ecliptic. It is a great circle assumed by the celestial sphere, that is, the projection of the earth's orbit on the celestial sphere. It intersects the equatorial plane in vernal equinox and vernal equinox.

Therefore, the constellation is calculated according to the new history. 1990 Lunar 3.22 corresponds to a new calendar of 4. 17, so it is Aries.