When did the weather start to be hot and cold?

Beginning of spring is getting warmer, and beginning of spring, one of 24 solar terms, stands for "the beginning", beginning of spring is the beginning of spring, and beginning of spring is when the sun reaches 3 15 degrees on February 4th or 5th every year. In China's climatology, beginning of spring is usually defined as a day when the daily average temperature is stable above 10℃ every five days, which is inconsistent with the meaning of beginning of spring in the middle and lower reaches of the Yellow River. In late February, only South China really entered the spring. But this division method is more practical. After beginning of spring, the temperature rose, and most parts of the country began a busy spring ploughing season.

It's getting cold in beginning of autumn. Beginning of autumn is the 13 solar term among the 24 solar terms, and beginning of autumn is on August 8th or 9th every year. "Autumn" means that summer is cool, which means the beginning of autumn. When you arrive in beginning of autumn, the plane tree will definitely begin to shed its leaves, which is why there is an idiom "When you lose a leaf, you will know autumn". Literally, the word "autumn" consists of "valley" and "fire", indicating the maturity of five grains. Beginning of autumn is the first solar term in autumn, and autumn is a transitional season from hot to cold, and then from cold to cold.

Extended data:

Twenty-four solar terms refer to 24 specific festivals in the China lunar calendar, which indicate the changes of seasons. They are formulated according to the position change of the earth on the ecliptic (that is, the orbit of the earth around the sun), and each one corresponds to a certain position reached by the earth every time it moves 15 on the ecliptic.

Twenty-four solar terms, a supplementary calendar established in the pre-Qin period and completely established in the Han Dynasty, is a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year. It divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with severe cold. It is not only a time standard promulgated by successive governments, but also a compass to guide agricultural production. People's compass for predicting cold, warm, rainy and snowy weather in daily life is the crystallization of the long-term experience and wisdom of Chinese working people.

2016165438+1October 30th, 24 solar terms was officially listed in UNESCO? List of representative works of human intangible cultural heritage. In the field of international meteorology, the 24 solar terms are known as "the fifth invention of China". On May 5, 20 17, the "Twenty-four Solar Terms" Protection Alliance was established in Gongshu District, Hangzhou, Zhejiang Province.

Twenty-four solar term song

The spring rain shakes the spring and the valley days, and the summer is full of mountains and summers.

Autumn dew, autumn frost, little snow in winter and cold in winter.

References:

Baidu encyclopedia-24 solar terms