Why is it so cold in the East?

Why is it cold in winter and hot in summer? It is because in winter, the height angle of the sun is small, the sun shines obliquely on the earth, the energy density of solar energy reaching the earth is small, and the earth gets less energy from the sun, so it is cold in winter; In summer, the height of the sun is high, and the sun shines almost directly on the earth. The energy density of solar energy reaching the earth is 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.