How does the precession of the earth's axis explain the westward shift of solar terms in the southern hemisphere?

Solar terms and daily lines are the same principle. Only the former is formed by revolution, and the latter is formed by rotation. The seasons in the northern and southern hemispheres are opposite, that is to say, suppose that the northern hemisphere is the vernal equinox and the southern hemisphere is the autumnal equinox. The earth turns from west to east, the northern hemisphere moves with the direct point of the sun into summer, and the solar terms (vernal equinox) move like the west (it can be understood that the west is the past). When the southern hemisphere enters winter, the solar terms (vernal equinox) also move westward. The precession of the earth's axis shows what we call "the vernal equinox moving westward"

But the westward shift of the vernal equinox itself does not affect the four seasons. Only the date of perihelion is affected.

The perihelion date of the earth has little to do with the four seasons of the earth.

For example, our current perihelion is about 1.4. More than 0 days after the winter solstice/kloc-0. Although it is perihelion, it is still winter in the northern hemisphere.

The vernal equinox moved westward for about 25,800 years. But even after 12000, the date of perihelion was moved to early July, that is, from summer to the future 10. At that time, it was still winter in the northern hemisphere after the solstice of winter.

Therefore, the phenomenon of four seasons upside down does not exist. The four seasons are only related to the declination of the sun (that is, the direct point of the sun).

When the sun shines directly on the tropic of cancer, it is the summer solstice in the northern hemisphere. It is also the arrival of the really hot summer in the northern hemisphere. As for where the perihelion of the earth is at this time, it does not affect the climate.