Why are there changes in spring, summer, autumn and winter all year round? What is the reason for this phenomenon?

Because the earth itself revolves around the sun, it will change in spring, summer, autumn and winter for the following reasons:

There is an included angle (23 26') between the earth's rotation axis and the earth's revolution plane around the sun (ecliptic plane). Therefore, when the earth revolves around the sun, the position of the direct sunlight on the earth will change from 23 26' south latitude to 23 26' north latitude, that is, the tropic of cancer.

When the sun shines directly, the heat and temperature on the earth's surface are high, which is summer; On the contrary, when the sun is tilted, the heat gained on the earth's surface is low, which is winter. When the sun shines directly into the northern hemisphere, it is summer in the northern hemisphere and winter in the southern hemisphere.

On the contrary, when the sun shines directly into the southern hemisphere, it is summer in the southern hemisphere and winter in the northern hemisphere. When the sun shines directly on the Tropic of Cancer, it is the winter solstice (around 65438+February 22nd) and the summer solstice (around June 22nd).

When the sun shines directly at the equator, it is the vernal equinox (about March 2 1) and the autumnal equinox (about September 2 1).

Extended data

The normal laws of climate change throughout the year are spring temperature, summer heat, autumn dryness and winter cold. Under the influence of climate change in four seasons, all creatures in nature will inevitably change accordingly, which is the natural law of Tibet in spring, summer, autumn and winter.

The physiological function of the human body is also in line with nature. If the metabolism of the body violates this law all the year round, the qi of the four seasons will hurt the five internal organs, that is, "cold in spring, heat in summer, dampness in autumn and typhoid in winter".

Baidu encyclopedia-all the year round

Baidu Encyclopedia-Spring, Summer, Autumn and Winter