Why is it so hot in summer?

In summer, the sun's altitude angle is large, and the sun shines almost directly on the earth. The energy density of solar energy reaching the earth is very high, and the earth gets more energy from the sun, so it is hot in summer.

Because the revolution of the earth around the sun is an ellipse, in winter, our earth is closer to the sun; In summer, our earth is far from the sun. In addition, the human body will naturally feel hot in summer. This is related to three aspects of human physique.