Why is it so cold in winter?

Qiu Lai goes in summer, winter and spring, year after year, and the four seasons are always in this cycle. How is this cycle of cold and warm seasons formed? We all have the experience of keeping warm by fire. When we face the fire, we feel particularly roasted; It's not so hot diagonally across the street. In addition, students who pay attention to observation will find such a phenomenon: the room facing south is sunny in winter, but the sunshine can't reach the room in summer. This shows that the height of the sun is changing: it is low in winter and the sun shines obliquely; It's hot in summer, with direct sunlight. If you think about the reasons for these phenomena, it is not difficult to understand the reasons for the changes of the four seasons. Periodic changes in the height of the sun cause periodic direct and oblique rays. Why does the height of the sun change periodically? In the process of the earth's revolution around the sun, the earth's axis always has an inclination angle of 66 degrees and 33 minutes with the orbital plane. Due to the inclination of the earth's axis, the height of the sun at different positions on the earth's surface is different when the earth is in different positions in its orbit. When the sun is high, the sun shines directly and the heat is concentrated, just like facing a stove; Moreover, the path of the sun in the air is long, the sunshine time is long, the days are long and the nights are short, and the temperature is bound to be high. It's summer. On the contrary, when the height of the sun is small, the sun shines obliquely on the ground, and the heat is dispersed, which is equivalent to leaning on the stove; Moreover, the path of the sun in the air is short, the sunshine time is short, the days are short and the nights are long, and the temperature is low; From winter to summer, the height of the sun changes from low to high. Similarly, the change of sun height affects the length of day and night and the temperature, forming autumn and spring respectively. Because the earth never stops sideways and revolves around the sun, this constant change in temperature and warmth forms the four seasons.

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