Why is it summer when the earth is far from the sun at apohelion and winter when the perihelion is close to the sun?

It is an objective fact that the earth 1 month passed the perihelion at the beginning and the perihelion at the beginning of July. Moreover, the perihelion of the earth also has precession, which is about 1 1 arc seconds per year, and it may become perihelion at any time after a long enough time.

The landlord's question may be why it is winter in the northern hemisphere when it is close to the earth and summer in the northern hemisphere when it is far away. The key to this problem is the altitude angle of the sun. Life experience can tell us that the higher the sun, the hotter the weather will be. In summer, the declination of the sun is greater than zero, the height is higher, and the energy received per unit area is higher; Winter is the opposite. In contrast, the eccentricity of the earth is only 0.007, which leads to a gap of 2% at perihelion, which is really a secondary contradiction.