Why does the position of the sun at the vernal equinox always stay at the beginning of Aries every year? Is there no precession?

The landlord's description is correct, except for one word, "Aries" and "Left".

The precession of the earth's axis leads to the retrogression of the vernal equinox, which is about 50 ″ per year, which is converted into about 20 minutes. In a year's time, this change is not significant. After more than two thousand years, the vernal equinox was no longer close to the intersection of Aries and Pisces in ancient Greece, but gradually moved to the position of Pisces near Aquarius, and officially entered Aquarius around 2600 AD.

As shown above, the red is the ecliptic, the blue grid is the second equatorial coordinate system, and the dotted line is the boundary of the constellation. The circled star is the 7-star HIP 14 in Pisces, which is very close to the vernal equinox (you can see from this label that the right ascension is almost 0). Aquarius is in the lower right corner and Aries is in the upper left corner. Obviously, the sun is still far away from Aries at the vernal equinox every year.

Then why did I say that the landlord's proposition was only wrong by one word? In fact, as long as Aries is changed to "Aries Palace", it is in line with the proposition. The Chinese zodiac is similar to the twenty-four solar terms in China's cultural tradition. It is divided into 12 parts, each of which is 30 degrees. The difference is that the 24 solar terms give each point a name called Zhongqi, which is similar to "vernal equinox", "Grain Rain" and "Xiaoman" ... In the west, no interval is named after the adjacent constellations, which are called Aries Palace and Taurus Palace in turn. ...

So just change the word, the meaning is completely different. Every year when the sun passes through the vernal equinox, it is defined as the beginning of Aries Palace, which has nothing to do with Aries except its name. Because of the time, I don't want to see the ephemeris mentioned by the landlord. But please confirm one thing carefully. Is Arial mentioned in it an imaginary constellation or an astronomical constellation?