How did the Frost Descent solar term come about?

How did the Frost Descent solar term come about?
Introduction: There are four seasons in a year, and the solar terms are a supplementary calendar established in ancient China to guide agricultural activities. Frost Descent is one of the 24 solar terms and the last solar term in autumn. September is in late autumn, and every day in September is full of harvest and hope. The Fortune Teller website can help you answer the lunar calendar and the fortunes and misfortunes for every day in September of the lunar calendar. Frost Descent – ​​The weather is getting colder and frost begins to appear. Frost's Descent usually falls on October 23rd or 24th of the Gregorian calendar every year. At this time, the first frost appeared in the Yellow River basin of China, and most areas were busy sowing crops such as wheat.
In ancient times, the frost was divided into three stages: the first stage was when jackals offered sacrifices as sacrifices, the second stage was when the grass and trees turned yellow and fell, and the third stage was when all stinging insects lay down. At this time, the jackals will collect the food they catch and then eat it. The leaves will gradually fall to the ground, leaving it withered and yellow leaves. The stinging insects will stay in their holes without moving or eating, and thus they will hibernate. Around October 23rd of the Gregorian calendar every year, when the sun reaches 210 degrees of the ecliptic longitude, it is the Frost Descent, one of the 24 solar terms. Frost Descent is the last solar term in autumn and the transitional solar term from autumn to winter. In late autumn, the ground dissipates a lot of heat and the temperature suddenly drops below 0 degrees. The water vapor in the air directly condenses on the ground or on plants to form tiny ice needles. Some become hexagonal frost flowers, which are white in color and have a loose structure.
"Frost begins with the Frost Descent" reflects the climatic characteristics of the Yellow River Basin. As for the number of frost days throughout the year, some places on the Qinghai-Tibet Plateau have frost and snow even in summer, with more than 200 frost days per year, making it the place with the most frost days in my country. The annual frost days in eastern Tibet, southern Qinghai, Qilian Mountains, western Sichuan Plateau, northwestern Yunnan, Tianshan Mountains, Altai Mountains, western mountains in northern Xinjiang, Northeast China and eastern Inner Mongolia are more than 100 days. The vast areas south of the Huaihe River and Han River and east of the eastern slope of the Qinghai-Tibet Plateau have less than 50 days. South of 25° north latitude and in the Sichuan Basin have only about 10 days. The area south of Fuzhou and along the coastal areas of Guangdong and Guangxi has an average of less than 1 day per year. Xishuangbanna, Hainan, southern Taiwan and the South China Sea islands do not have any frost.
"Collected Explanations of the 72 Seasonal Changes" says about Frost Descent: In the middle of September, the air becomes cold and condensed, and the dew turns into frost. "Shuangjiang" means the weather is getting colder and the dew is condensing into frost. In ancient my country, Frost Descent was divided into three stages: the first stage was when jackals offered sacrifices as sacrifices; the second stage was when the grass and trees turned yellow and fell; the third stage was when all stinging insects lay down. The jackals begin to capture prey and sacrifice animals, using animals to offer sacrifice to heaven in return for their origins, and also to offer sacrifice to the autumn gold; the leaves on the ground turn yellow and fall; the stinging insects all stay in their holes, motionless and uneaten, with their heads down, entering hibernation.
The ancient book "Explanation of the Twenty-Four Solar Terms" says: "When the weather becomes cold, frost falls, and the yin begins to condense." It can be seen that "frost falls" means that the weather is gradually getting colder and frost begins to fall. In meteorology, the first frost in autumn is generally called "early frost" or "first frost", while the last frost in spring is called "late frost" or "final frost". The period from the last frost to the first frost is the frost-free period. Some people also call the early frost "chrysanthemum frost", because the chrysanthemums are in full bloom at this time. Su Shi, a great writer in the Northern Song Dynasty, wrote a poem: "Thousands of trees are swept into yellow, only the lotus is fragrant alone."

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