What is the meaning of the twenty-four solar terms Frost Descent

The Frost Descent solar term means the weather is getting colder and the first frost appears. It is the last solar term in autumn and also means the beginning of winter. Frost Descent During this time of year, health care is particularly important. There is a folk proverb, "It is better to replenish your health all year round than to replenish your body with frost", which shows the impact of this solar term on people. The following is a composition compiled by the editor of yuwenmi. Come and take a look. I hope it will be helpful to you.

What does "Frost Descent" mean in the twenty-four solar terms? 1:

Frost Descent means that the weather is getting colder and frost begins to fall. It is the eighteenth solar term in the twenty-four solar terms. On October 23 or 24 of the Gregorian calendar, when the sun is at 210° of ecliptic longitude, frost falls, which is the last solar term of autumn.

Frost refers to the first frost. "Collection of the Seventy-two Hours of the Moon Order" says: "In mid-September, the air is solemn and condensed, and the dew condenses into frost." At this time, the temperature drops to 0 degrees. Below, water vapor in the air condenses into white crystals on the ground, called frost

. At this time, the first frost usually occurs in the Yellow River Basin of China. Most areas are busy sowing wheat and other crops. Plants that are not cold-tolerant will stop growing, presenting a late autumn scene, which is a good time to appreciate maple leaves. "Yi Zhou Shu·Zhou Yue": "The middle Qi of autumn in March: the end of heat, the autumnal equinox, and the frost." "Guoyu·Zhou Yuzhong": "When fire is seen, the breeze will stop the cold." Wu Weizhao of the Three Kingdoms noted: "After the frost, the breeze comes first. , so people are warned to prepare for the cold. "Chapter 15 of the first volume of Wei Wei's "Eastern": "In terms of solar terms, there have been several frosts here before the frost comes."

Twenty-four solar terms. What does frost mean 2:

Every year around October 23 of the solar calendar, when the sun reaches 210 degrees of ecliptic longitude, it is the frost in the twenty-four solar terms. Frost's 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 condenses directly on the ground or plants to form tiny ice needles, and some become hexagonal frost flowers, which are white in color and loose in structure.

"The Collection of the Seventy-Two Hours of the Moon Order" says about frost: In the middle of September, the air is solemn and condensed, and the dew turns into frost. At this time, hoarfrost has appeared in the Yellow River Basin of China. On the fertile fields thousands of miles away, a piece of silver ice crystal shines. At this time, the leaves are yellow and falling. The ancient book "Explanation of the Twenty-Four Solar Terms" says: "The Qi is solemn and frost falls, and the Yin begins to condense." It can be seen that "frost fall" means that the weather is getting colder and the dew condenses into frost. In ancient my country, frost was divided into three periods: in the first period, jackals were sacrificial animals; in the second period, vegetation yellowed and fell; in the third period, stinging insects dropped their bodies. The wolves began to capture their prey and sacrificed the beasts. They sacrificed the beasts to the gods and offered sacrifices to the autumn gold. The leaves on the ground withered and yellowed and fell. The stinging insects all stayed in their holes and did not eat. They lowered their heads and entered a state of hibernation. middle. "Frost begins with frost" reflects the climate characteristics of the Yellow River Basin. In terms 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. Eastern Tibet, southern Qinghai, Qilian Mountains, Western Sichuan Plateau, northwest Yunnan, Tianshan Mountains, Altai Mountains, western mountainous areas of Northern Xinjiang, Northeast China and eastern Inner Mongolia have more than 100 frost days per year. The areas south of the Huaihe River and Han River and the eastern slope of the Qinghai-Tibet Plateau have more than 100 frost days per year. The vast area to the east has less than 50 frost days, south of 25° north latitude and the Sichuan Basin only has about 10 days, the south of Fuzhou and the coastal areas of Guangdong and Guangxi have an average annual frost day of less than 1 day, while Xishuangbanna, Hainan, southern Taiwan and the South China Sea Islands It is a place where there is no frost.

"Frost kills all grass", plants that have been hit by severe frost have no vitality at all. This is because the liquid in the plant freezes into ice crystals due to frost, protein precipitates, and the water in the cells leaks out, causing the protoplasm to become severely dehydrated and deteriorate. "The wind, the sword, and the frost are fiercely pressing each other" shows that frost is ruthless and cruel. In fact, although frost and frost are closely related, it is the "freeze" that harms crops, not the "frost". Someone once experimented: Put two leaves of a plant in boxes with the same low temperature. One leaf was covered with frost, and the other leaf was not covered with frost. As a result, the frost-free leaf was severely damaged, while the frost-covered leaf was only Minor signs of frost damage.

This shows that frost can not harm crops. On the contrary, when water vapor condenses, it can also release a large amount of heat. When 1 gram of water vapor at 0°C condenses into water, the heat of vaporization is 667 calories, which will turn heavy frost into light frost. , light frost turns into dew, avoiding freezing damage.