Why the sun is very big in the morning, but the weather is very cold; At noon, the sun is small, but the weather is very hot.

In the morning, the sun's altitude angle is small, and the sun shines obliquely on the ground, so the earth absorbs less heat, radiates less energy to the atmosphere and has a low temperature; At noon, the sun has a high angle, and the sun looks for the earth approximately directly. The earth absorbs more heat, radiates more energy to the atmosphere, and the temperature is very high. The size of the sun is also related to the incident angle of the sun. Because the morning comes from that angle, the air that the sun passes through will naturally refract, so it looks like the sun is getting bigger, but it is actually the same size. Just take a flashlight. The more air passes through, the larger the aperture.