Why is it cool when the sun just rises, but it is hot at noon?

Scientific knowledge in Two Children Debate Day.

The distance between the sun and the earth is the same in the morning and at noon. Why does the sun look bigger in the morning than at noon? This is a visual error and illusion. The same object appears small in a group of larger objects, but large in a group of smaller objects. Similarly, the morning sun rises from the horizon with trees, houses, distant mountains and a small corner of the sky as the background. In this contrast, the sun looks bigger at this time. At noon, the sun rises high and the vast sky is the background. At this time, the sun appears small. Secondly, the white object of the same object is bigger than the black object. This physical phenomenon is called "light penetration". When the sun rises, the background is a dark sky and the sun is particularly bright; At noon, the background is the blue sky in Wan Li, and there is little contrast between the sun and its brightness, so it is smaller.

The temperature at noon is higher than in the morning. Is the sun closer to us than in the morning? Not exactly. The main reason is that the sun shines obliquely on the earth in the morning and directly on the earth at noon. At the same time and in the same area, the direct heat is higher than the oblique heat. At the same time, at night, the heat of the sun on the ground dissipates, so it feels cool in the morning; At noon, the heat of the sun shines on the ground, so I feel hot. A cool or hot temperature doesn't mean how far the sun is from the ground.