202 1 What does first frost mean in the first frost solar term?
202 1 What does first frost mean in the first frost solar term?
The "first frost" of the solar term reflects the climatic characteristics of large temperature difference between day and night, obvious autumn dryness and gradually cold weather, which does not mean that it will be "frost" when entering this solar term. In fact, "frost" didn't fall from the sky. The "frost" is the condensation of water vapor on the ground when it meets cold air due to the change of temperature difference. There is no concept of "first frost" in meteorology. Meteorologically, the first frost in autumn is generally called "first frost" or "first frost", and the last frost in spring is called "late frost" or "final frost". The interval from the last frost to the first frost is a frost-free period, and "frost" generally appears in autumn, winter and spring. The solar term "first frost" has nothing to do with "first frost" and is not the same concept. The "frost" of the first frost means that "frost" is a manifestation of cold weather and large temperature difference between day and night. Therefore, it is named "first frost", which means that the temperature drops suddenly and the temperature difference between day and night is large.
The origin of the custom of eating persimmon in the first frost
The first frost is a transitional period from autumn to winter. At this time, the temperature is getting colder and there is frost in most parts of the country at night. The sudden drop in temperature is also very unfavorable to the human body, especially the lungs and stomach, which need to be nourished. Therefore, there is a folk saying that "eating persimmons in the first frost will not cause runny nose". First of all, first frost's statement is about the nourishing effect of eating persimmons.
The meaning of winter solstice and first frost in the twenty-four solar terms.
First frost: it's getting colder and colder, frosty.
The first frost is one of the 24 solar terms of the lunar calendar. Entering this solar term, the weather is getting colder and frosty. The first frost usually occurs on the 23rd day of the Gregorian calendar 10 year 10. At this time, the first frost appeared in the Yellow River basin in China, and most areas were busy planting crops such as three wheat. In ancient China, the first frost was divided into three stages: "One stage was that the jackal sacrificed animals; Second, the vegetation is yellow; Three waiting insects are salty. " In this solar term, jackals will show their prey before eating them. The first frost occurs when the sun reaches the longitude of 2 10 degrees every year around Gregorian calendar 10 year10 23rd. The first frost said that the weather was colder and the dew condensed into frost. "Twenty-four solar terms": "In mid-September, the essence is cold and condensed, and dew cream". At this time, frost has appeared in the Yellow River Basin of China, and a silver ice crystal shines in the fields thousands of miles away. At this time, the leaves turned yellow and fell. The ancient book "Twenty-four solar terms" says: "When the frost comes, the yin begins to coagulate." It can be seen that "first frost" means that the weather is getting colder and it begins to frost. Meteorologically, the first frost in autumn is generally called "first frost" or "first frost", and the last frost in spring is called "late frost" or "final frost". The interval from the last frost to the first frost is a frost-free period. Some people also call the first frost "Chrysanthemum Frost", because chrysanthemums are in full bloom at this time, and Su Shi, a great writer in the Northern Song Dynasty, said in a poem: "All trees are sweeping away pornography, and only Furong is alone."
Solstice of winter: Cold is coming.
The winter solstice is the 22nd solar term in the "24 solar terms", and the solar calendar reaches 270 degrees. Every year, the festival is held on 65438+February 2 1-23 in the Gregorian calendar. The winter solstice is the limit of the sun's southward travel, and the height of the sun in the northern hemisphere is the smallest on this day. On the solstice of winter, the sun shines directly on the tropic of Capricorn, and the sun is most inclined to the northern hemisphere. The solstice in winter is the turning point of the sun. After this day, it will go back. The direct point of the sun will move northward from the Tropic of Capricorn (23 26' s), and the northern hemisphere (China is located in the northern hemisphere) will increase day by day.
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