Why does the sorting of the twelve constellations start from Aries?

If you know a little about horoscopes before, you will find that the date of Aries started on March 2 1, but why is Aries always the first to be introduced?

In fact, constellations are divided by the movement of celestial bodies. If you still don't know how to divide the dates of the twelve constellations, please read this article in the First Constellation Network: How to Divide the Dates of the Twelve Constellations (/astro/ Shi Zhi /art 18969.aspx).

Friends who have read this article should understand the division of constellations, so why did the constellations start from Aries?

As we all know, the sun is always in motion, and its trajectory is called the ecliptic. And if the equator of the earth is infinitely extended to intersect with the ecliptic, one of the intersections is the "vernal equinox". From the vernal equinox, divide an area every 30 degrees to form an equal zodiac. And this vernal equinox is the starting point of the twelve constellations formulated by predecessors. On March 2 1 every year, the sun will come to the vernal equinox and enter Aries Palace.