Why is the sun in the south at noon?

Affected by the earth's rotation, the sun moves in a relative circle around the earth.

Due to the inclination of the earth's axis, after the solar vernal equinox in the northern hemisphere, the sun rises from the east to the north in the morning, then turns to the south, reaches the southernmost point around noon, then turns to the north, and sets from the west to the north at dusk. The sun travels a long way in the sky, and the day is longer than the night. Then it enters our back and bypasses the other side of the earth. At this time, the southern hemisphere entered winter with short sunshine. Then turn to the next day.

These are the basic laws of the motion of a sphere. The direct point of the sun is south of our latitude, so the sun is also south at noon.