What is the change of seasons?

The change of four seasons is the change of four seasons, which is the same as the change of four seasons.

The reason of seasonal change is that the orbital plane of the earth's revolution and rotation has an included angle, which leads to the inclination of the earth when it rotates. The earth's orbit is approximately a perfect ellipse, and the sun is likely to be near one of the focal points.

The autobiographical earth always keeps a certain angle relative to the sun, so the distance between a point on the earth and the sun is different in different periods of the earth's revolution, which leads to the changes of temperature and the length of day and night. The four seasons of the year are thus produced.

Extended data

Division of the four seasons:

I. Tradition4 Legislation

The traditional method of dividing the four seasons in China takes the "four stands" in the 24 solar terms as the starting point of the four seasons, and the dichotomy and the two-to-one method as the midpoint. For example, in spring, the starting point is beginning of spring, the solar line is 3 15, the spring is divided into the midpoint, the long summer is the end point, the solar line becomes 45, and the sun runs 90 on the ecliptic. The rotation of the four seasons reflects the changing laws of phenology and climate.

Second, the classification of the West

Astronomical classification (that is, western classification) emphasizes the climatic significance of the four seasons, with the vernal equinox of the sun as the starting point of the four seasons, such as spring as the starting point and summer solstice as the end point. These four seasons are one and a half months later than the traditional four seasons in China.