Why is it cool in the morning and hot at noon?

The distance between the earth and the sun and the relationship between morning and evening can be ignored.

The average distance from the sun to the earth is1.500 million kilometers, while the radius of the earth is only 6378 kilometers. The difference between the distance between the sun and the earth in the morning and at noon, that is, this radius, is negligible compared with the distance between the sun and the earth of10.50 billion kilometers.

Summer in the northern hemisphere coincides with the poles of the earth. The distance between perihelion and apohelion is 50 million kilometers, which is nearly ten thousand times larger than noon in the morning.

Why is there such a big difference between winter and summer on earth? This is because there is an angle between the autobiographical axis of the earth and the revolution plane, which is called the intersection angle between the yellow (Tao) and the red (Tao), which is 22 degrees, 26 minutes and 32 seconds. The rotation axis translates in space, resulting in the intense radiation of the first sun in the northern hemisphere in summer and the opposite in winter.

Why is there a big difference between morning and noon? The morning sunlight is not only oblique, but also passes through the atmosphere, which is ten or twenty times thicker than that at noon, so the power of the sun is naturally much smaller.

So people's feelings about the power of the sun are mainly the difference between direct and oblique.