What is the first frost?

What does the first frost of the twenty-four solar terms mean?

The first frost solar term means that 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. Health care is particularly important in the first frost season. There is a folk proverb that "it is better to make up the first frost one year", which shows the influence of this solar term on people. The following is a composition compiled by Yu Wenmi Bian Xiao. Come and have a look. I hope it helps you.

What does the first frost mean in the twenty-four solar terms?

The first frost means that the weather is getting colder and first frost begins, which is the eighteenth of the 24 solar terms. The first frost is the last solar term in autumn when the sun is at 2 10 on the 23rd or 24th of October in the solar calendar.

The first frost refers to the first frost. Twenty-four solar terms say: "In mid-September, the air is cool and condensed, and the dew is like frost." At this time, when the temperature drops below 0 degrees, the water vapor in the air condenses into white crystals on the ground, which is called frost.

. At this time, the first frost usually appears in the Yellow River valley in China, and most areas are busy planting crops such as wheat. Plants that are not hardy will stop growing and present a scene of late autumn, which is a good opportunity to enjoy the maple leaves. Yizhoushu Zhou said: "Autumn and March are empty: summer, autumn equinox, first frost." "Mandarin Zhou Yuzhong": "See the fire and cool breeze to stop the cold." "The History of the Three Kingdoms Wu" notes: "As the saying goes, after the first frost, the breeze comes first, and people should have a cold heart." Wei Wei's "Oriental" Chapter 15: "In the solar terms, there are several frosts here before the first frost."

What does the first frost mean in the twenty-four solar terms?

Every year around Gregorian calendar 10 year 10, when the sun reaches the longitude of 2 10 degrees, it is the first frost in the 24 solar terms. The first frost is the last solar term in autumn, which is the transition from autumn to winter. There is a lot of heat dissipation on the ground in autumn, and the temperature suddenly drops below 0 degrees. Water vapor in the air directly condenses on the ground or plants to form fine ice needles, and some become hexagonal frost flowers, which are white and loose in structure.

"Twenty-four solar terms" said that the first frost: in mid-September, the gas was cold and condensed, and the dew became frost. At this time, frost has appeared in the Yellow River Basin of China, and a piece of silver ice crystals is shining in the fields thousands of miles away. At this time, the leaves turned yellow and fell. The ancient book "Twenty-four solar terms" said: "Qi stagnates at the beginning of frost, and Yin begins to coagulate". It can be seen that the "first frost" means that the weather is getting colder and the dew condenses into frost. In ancient China, the first frost was divided into three stages: first, the jackal sacrificed animals; Second, the vegetation is yellow; Three stings are salty. The jackal began to catch prey, sacrifice animals, and sacrifice to heaven to repay the kindness of animals, paving the way for sacrificing autumn gold; The leaves on the earth turned yellow and fell; The stinging insects are motionless in the cave and hang their heads into hibernation. "The first frost in the first frost" reflects the climate characteristics of the Yellow River Basin. As far as the annual frost days are concerned, there are frost and snow in some parts of the Qinghai-Tibet Plateau even in summer, and the annual frost days are over 200, which is the place with the largest number of frost days in China. The annual frost days in eastern Tibet, southern Qinghai, Qilian Mountains, western Sichuan Plateau, northwestern Yunnan, Tianshan Mountains, Altai Mountains, western mountainous areas of northern Xinjiang, northeast China and eastern Inner Mongolia all exceed 100 days, and the vast areas south of Huaihe River, Hanshui River and east of Dongpo of Qinghai-Tibet Plateau are all below 50 days, with only the annual frost days in the south of 25 north latitude, Sichuan Basin, south of Fuzhou and coastal areas of Guangdong and Guangxi being/kl.

"The first frost kills a hundred herbs", plants that have been hit by severe frost have no vitality at all. This is because the liquid in plants forms ice crystals due to frost, protein precipitates, and the water in cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated. "The wind knife and frost force the sword", which shows the ruthlessness and cruelty of frost. In fact, frost and frost are inseparable, but it is "freezing" that harms crops, not "frost". Someone once tried to put two leaves of a plant in a box with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period. This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite.