Precession solar terms

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, and the northern hemisphere enters summer with the movement of the sun's direct point. The (vernal equinox) solar terms move westward (which can be understood as the past in the west), and the southern hemisphere enters winter, and the solar terms (vernal equinox) also move westward (which is understood as the distance is getting closer and closer, and if it is farther and farther east, it will not catch up).