Where is the direct sunlight latitude line at the vernal equinox, summer solstice, autumn equinox and winter solstice?

At the vernal equinox and autumnal equinox, the sun shines directly on the equator, and the solstice in summer and the solstice in winter respectively shine directly on the Tropic of Cancer and Tropic of Capricorn.

During the day, the height of the sun rises gradually after sunrise and reaches its maximum at noon. After that, the height of the sun gradually decreased. Among them, the noon sun height is called the noon sun height, which is the largest sun height in a day. From summer to the sun, the tropic of cancer and its northern latitude reach the maximum, and the tropic of cancer and its southern latitude reach the minimum. In winter solstice, the Tropic of Cancer and its south latitude reach the maximum, and the Tropic of Cancer and its north latitude reach the minimum.

At the vernal equinox, the direct point of the sun is on the equator, and the whole world is equally divided day and night. In the time period, it refers to the position where the sun is located between 0 and 15, that is, from March 20th to April 5th. But in fact, it usually refers to the day when the sun is really at 0 degrees of the longitude of the yellow meridian: March 20 or March 2 1. On the vernal equinox, the sunrise and sunset time is 6 o'clock all over the world.