When does Frost Descent begin? Analysis of the relationship between Frost Descent and frost!
The cool breeze in the early morning makes people feel a little bit of coolness. In the blink of an eye, it is the Frost Descent season, and the weather is getting colder and colder. When does Frost Descent begin? Analysis of the relationship between Frost Descent and frost! The ninth month of the lunar calendar is a season of clear and cool autumn weather, with chrysanthemums in bloom. It is also the harvest season and is known as the golden September. Shuimoxiansheng.com's special topic on the ninth month of the lunar calendar in 2019 will share with you the beauty of September.When does Frost Descent begin?——The beginning of Frost Descent is always in October of the Gregorian calendar. The specific date is calculated as follows:《1》Calculation formula for the date of frost: [Y*D+C]-L Interpretation of the formula "2": Y=last two digits of the year, D=0.2422, L=leap year number, C=23.438 in the 21st century, C=24.218 in the 20th century. 《3》Example: The date of Frost Descent in 2088 = [88×0.2422+23.438]-[88/4]=44-22=22, and Frost Descent will be on October 22. 《4》Exception: The calculation result for 2089 will be increased by 1 day. The beginning date of the Frost Descent is one of the three days between October 22nd and October 24th of the Gregorian calendar every year. Analysis of the relationship between frost and frost——Frost and frost"Frost Descent" and "Frost" are two different concepts. Frost Descent is just a solar term, during which the first frost generally appears in the middle and lower reaches of the Yellow River; while frost is associated with plant damage. Where there are no plants, there will be no frost. ——Frost and frost <br /> Although frost and frost are closely related, it is the "freeze" rather than the "frost" that harms plants. Someone once conducted an experiment: two leaves of a plant, one of which was covered with frost and the other was not, were placed in boxes with the same low temperature. The result was that the frost-free leaf was severely damaged, while the frost-covered leaf only had slight signs of frost damage. Facts have proved that frost not only does not harm crops, but on the contrary, when water vapor condenses, it releases a large amount of heat, preventing plants from frost damage. Rather than saying "Frost kills all the grass", it is better to say "Frost kills all the grass". Since there is frost during the continuous freezing period (sometimes there is no frost, which is called black frost), autumn frost and spring frost are collectively referred to as frost. Three signs of Frost Descent <br /> In ancient China, Frost Descent was divided into three signs: "The first sign is when jackals offer sacrifices to animals; the second sign is when the grass and trees turn yellow and fall; the third sign is when all the hibernating insects lie down." ——During this solar term, people start to capture prey and offer sacrifices to animals. Using animals to offer sacrifices to heaven is a way of repaying one's parents. It also means offering sacrifices to the autumn gold. One theory is that jackals display their captured prey before eating it. The leaves on the ground turn yellow and fall off. The hibernating insects all stay motionless and uneaten in their holes, with their heads down, entering hibernation. |
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