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Gregorian calendar every year10month23Before and after the day, the sun reaches the yellow longitude210The degree is the frost in the twenty-four solar terms。Frost is the last solar term of autumn，It is the transitional solar term from autumn to winter。There is a lot of heat dissipating on the ground in autumn evening，The temperature suddenly dropped to0Below degrees，Water vapor in the air condenses directly on the ground or plants to form tiny ice needles，Some become hexagonal frost flowers，White color and loose structure。

    "The Collection of the Seventy-two Hours of the Moon Order" about the frost: mid-September，The air is solemn and condensed，The dew turns into frost。At this time，White frost has appeared in the Yellow River Basin of China，Thousands of miles of fertile wilderness，A silver ice crystal sparkles，The leaves are withered and yellow at this time，The leaves are falling。The ancient book "Explanation of the Twenty-Four Solar Terms" says: "The Qi is solemn and the frost falls，Yin begins to condense”bet365 online sports betting。It can be seen that "frost" means that the weather is getting colder，Dew condenses into frost。In ancient my country, frost was divided into three periods: in the first period, jackals were sacrificed to animals；The second period of vegetation yellowing；Three phases of stinging insect salty bend。The jackal begins to capture its prey，Sacrifice to animals，Sacrificing animals to heaven is the source of retribution，The meaning of laying a square pavilion to offer sacrifices to Autumn Gold；The leaves on the earth have withered and fallen；The stinging insects are all still in the hole and will not eat，Duck your head and enter hibernation。

    “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，Frost days are here every year200More than days，It is the place with the most frosty days in my country。Eastern Tibet、Southern Qinghai、Qilian Mountains、Western Sichuan Plateau、Northwestern Yunnan、Tianshan、Altai Mountains、Mountain area in western northern Xinjiang、The Northeast and eastern Inner Mongolia and other places have more than one frost day every year100days，Huaihe、South of Han River、The vast areas east of the eastern slope of the Qinghai-Tibet Plateau are all in50Below the sky, north latitude25Only to the south of ° and the Sichuan Basin10About 11514 days, the average annual frost days south of Fuzhou and along the coasts of Guangdong and Guangxi are less than 10 days1days，And Xishuangbanna、Hainan, southern Taiwan and the South China Sea Islands are places without frost。

    "Frost kills all grass"，Plants beaten by severe frost，No life at all。This is due to the liquid in the plant，frozen into ice crystals due to frost，Protein precipitation，Extravasation of water within cells，Severely dehydrates the protoplasm and causes it to deteriorate。“The wind, the sword, and the frost are facing each other fiercely” shows that frost is ruthless、cruel。Actually，Frost and frost are inseparable，But it is “freeze” that harms crops, not “frost”。Someone once experimented: take two leaves of the plant，Place them in boxes with the same low temperature，One of the leaves is covered with frost，The other leaf is not covered with frost，Frost-free leaves are severely damaged，The frost-covered leaves only have slight traces of frost damage。This shows that frost cannot harm crops，Opposite，When water vapor condenses，It can also release a lot of heat，1gram0The water vapor at ℃ condenses into water, and the heat of vaporization released is667Card，It will turn heavy frost into light bet365 online sports betting livefrost、Light frost turns to dew，Free from freezing damage。