Why should a year be divided into four seasons, ten months and twenty-four solar terms?

The earth revolves around the sun, and its orbit is elliptical. In the process of revolution, the sun's direct and oblique rays reach the earth, which is the main reason why the earth gets solar heat. When the earth revolves around the sun, it always keeps an inclination of 23.5 degrees, so all areas on the earth are different from the direct and oblique rays of the sun, which change regularly and periodically in a year, thus leading to the changes of the four seasons. On the orbit of the earth's revolution, there is a point every 15 degrees, which makes a 360-degree revolution. * * has 24 points. During the revolution of the earth, every point reached is a solar term, and 24 points are 24 solar terms.