Who can help me explain why there are four seasons in a year and why there are differences between them from the perspective of the earth's rotation and revolution?

The four seasons are caused by the inclination of the earth axis and the revolution of the earth. The earth revolves around the sun once, and the radiation and heat received by the northern and southern hemispheres are constantly changing, resulting in a cycle of alternating cold and warm. The division of the four seasons is consistent with the scenes of nature. Meteorological departments usually say that when the average temperature is stable at around 10℃, it is the beginning of spring, when nature is full of flowers, green grass, colorful and full of vitality. When the average temperature of that day rose above 22℃, the weather gradually warmed up, so summer began. On that day, the average temperature dropped from 22℃ to below 22℃, and autumn came, when the leaves began to fall and the fruits matured. When the temperature continues to drop below 10℃, the long winter begins with a slight chill.

The reasons why the days are long and short are as follows:

On the one hand, the earth revolves around the sun, and at the same time it rotates around the earth's axis. If the earth's axis is perpendicular to the orbital plane, the direct sunlight will always be near the equator, so the length of day and night is the same anywhere on the earth. In fact, the earth's axis is not perpendicular to the orbital plane, but always keeps an inclination of 66 33'. Therefore, when the earth is in orbit, the position of direct sunlight on the earth's surface is different due to the change of its relative position with the sun. In a year, the direct point of the sun varies between 23 27' north and south latitudes (that is, between the Tropic of Cancer). When the point of direct sunlight is in the tropic of Capricorn, the northern hemisphere receives sunlight obliquely, and the exposure time is short, while the exposure time is long, so the days are short and the nights are long. As we know, the direct and oblique rays of the sun are the reasons that affect the weather of the earth, so when the northern hemisphere is oblique to the sun, it is winter.