Why does it get cold?

Why does it get cold? The answer is that the ambient temperature drops. The cold air activity on the earth is the direct cause of the cold weather. At the same time, because the earth revolves around the sun, when the direct point of the sun in the northern hemisphere moves south, these places in the northern hemisphere will get cold. Similarly, in the southern hemisphere of the earth, when the direct point of the sun moves northward, these places in the southern hemisphere will get cold. Cold air transit will bring rain and snow. , will make the temperature plummet. Every time the cold air invades, the intensity is different, the strength is different, and the cooling rate is more or less. The weather will get cold because the direct point of the sun changes with the rotation of the earth. In winter, the direct point of the sun is in the southern hemisphere, and the height angle of the sun is small. Sunlight shines obliquely on the earth, and the amount of sunlight received per unit area of the earth decreases. In other words, the energy density of the sun reaching the earth is smaller, and the earth gets less energy from the sun, so it becomes cold.