Historical evolution chart of solar terms development

The traditional twenty-four solar terms are divided according to the seasonal changes of natural phenomena, which mainly guide people to carry out agricultural production, when to sow, when to irrigate and when to harvest, and always accompany people's farming life; This set of solar terms came into being with the development of agriculture, and it didn't evolve into a unified lunar calendar until the Han Dynasty.

In Qi, there are thirty solar terms, which are recorded in Guan Zi You Guan, as follows:

Spring: the earth is angry and abstains from spring; Small base, plowing; In the weather, give; Loyalty, repairing the door; Qingming, class; First, male and female; Zhongmao; , next;

Xia: Xiaoying, Germany; Exhausted, the next Jue reward; Chinese and English, giving; Absolutely, together; It's good that summer has come; Heatstroke; Late summer;

Autumn: the wind comes, and autumn is forbidden; Xiaomao, thin and white; Under the Millennium, meet; Re-management and giving; The beginning of the festival; First, male and female; Zhongmao; Xiamao;

Winter: the beginning of cold, punishment; Small elm tree, given; Moderate cold, gathering; Zhongyu. A bumper harvest; Cold, quiet; Great cold, yin; Big cold end;

We can see that the precautions of each solar term are also marked, which is very intuitive.

Then why is anger different? More scientifically, it is because Qi is a coastal area, with short spring and autumn, long winter and summer, and spring and autumn are the seasons for sowing and harvesting. In order not to delay the agricultural production of ordinary people, it is divided into more details, so that ordinary people can better arrange their labor in spring and autumn; Like the above 30 solar terms, there are eight solar terms in spring and autumn, and 12 day is one, which is relatively clear and definite.

As an agricultural system arrangement, the 24 solar terms are the treasures of our Chinese nation. It has a long history and has been handed down from generation to generation. Until now, we are still singing this solar term ballad: "Spring rains shake the valley in spring, summer is full and summer is hot, autumn is cold and frost falls, winter is snowy and winter is cold."