Why does the weather change?

When the radiation of the sun matches the temperature of different surfaces on the earth, the air will expand with heat and contract with cold. There will be lightning when there is friction between air (clouds) with a lot of water vapor, and there will be rain when hot air meets cold air (the stronger the convection between them, the greater the temperature difference, and the more drastic the weather changes). This is the change of weather and climate, because there is an angle between the north and south poles of the earth and the plane where the solar system is located. Because the earth revolves around the sun and the included angle remains unchanged, the position of the sun on the earth will be different, mainly referring to the latitude difference. The difference between day and night is the rotation of the earth, which is the difference of longitude.