How to divide spring, summer, autumn and winter?

How to divide the four seasons:

1. Is it a solar term method?

Astronomically speaking, the spring equinox, summer solstice, autumn equinox and winter solstice are the beginning of the four seasons. Beginning of spring, Changchun, beginning of autumn and beginning of winter were the four seasons in ancient China. This is based on the position of the earth in orbit. ?

This is the lunar calendar.

Lunar calendar 65438+ October to March is spring, April to June is summer, July to September is autumn, and 65438+ October to 65438+ February is winter. ?

This is the solar calendar method.

Meteorology usually takes March-May as spring, June-August as summer, September-165438+10 as autumn, and June-February as winter. ?

Fourth, it is phenology.

Willow leaves are scattered, peach blossoms are in full bloom, and spring is coming; Trees are shady, the sun is hot, and summer is here; Fruit leaves fall, water is cold, and the time sequence is autumn; The grass withered, the north wind roared, and the years entered the winter. ?

The scientific division method is the fourth method of quantification, which divides the four seasons with the five-day average temperature as the index: the average temperature is stable below 10℃ as winter, above 22℃ as summer, and between 10 ~ 22℃ as spring or autumn.

Spring, summer, autumn and winter, also known as the "four seasons", are the results of the earth's orbit around the sun. Spring begins with "beginning of spring" in the 24 solar terms, and summer begins with "Long Summer". Autumn begins with beginning of autumn; Winter begins in beginning of winter. It is the most accurate in the Yellow River Basin. The basic laws summarized by the working people in China are: spring birth, long summer, autumn harvest and winter storage. This is also the basic idea of the relationship between man and nature elaborated in China classics such as Huangdi Neijing.