Fortune Telling Collection - Zodiac Guide - Using stellarium (virtual planetarium) to simulate the position of the sun, it is found that the position of the sun is always a constellation behind. What is the reason?

Using stellarium (virtual planetarium) to simulate the position of the sun, it is found that the position of the sun is always a constellation behind. What is the reason?

When astrology originated, the vernal equinox was in Aries, but because of precession, he has now moved to Pisces near Aquarius, causing all the constellations to advance by one.

In fact, in astronomy, the zodiac sign is 13, not12 in astrology; Moreover, the declination distribution of the zodiac is very uneven, which will also make the astrological position of the sun inconsistent with the actual position.