The annual cold dew begins on 10 year 10 on 8th or 9th, and ends on 23rd or 24th. Send away the beautiful September and welcome the golden autumn October. From the heat, the Millennium and the autumnal equinox, we are praising autumn all the way. When it comes to the cold season, we still won't spare the beautiful language. Autumn is crisp, the sun is shining, the sky is clear in Wan Li, and the moon meets the stars, which is still the main theme of the weather in many parts of our country at this time. At this time, when southerners began to enjoy the cool autumn wind, northerners were already enjoying the beautiful scenery of late autumn.

a

During the cold dew solar term, the direct point of the sun has left the equator and moved from 5 57 ′ south latitude to 65 438+065 438+0 32 ′ south latitude. At this time, the solar altitude angle in the northern hemisphere changes from large to small, and the solar heat received by the ground is obviously reduced compared with that in summer, and the temperature is obviously reduced. Most parts of the country, even South China, will be affected by cold air. At this time, many people began to express their feelings with "cold".

b

From the surface of the word, in fact, the "cold" of cold dew means cold, and "dew" means the phenomenon that water vapor in the near-surface layer will condense into dew. However, from the meteorological point of view, the cold dew solar terms are the same as the white dew and the first frost, and the significance of its heat change is more obvious than its humidity change It should be said that it more embodies a process of temperature change and seasonal change.

Maybe people in the south will have such a language. Why don't we see dew in the morning or evening when it's cold and rainy? In fact, it is easy to understand, because the 24 solar terms come from the Yellow River Basin. At this time, the temperature in the south of the Yangtze River is still high, and the dew appears later than in the north.

c

The solar term from the cold dew to the back of the first frost is only a short 15 day, but it is a period of time in a year when the temperature drops rapidly. After a cold air, it is common that the daily average temperature drops by 8℃ and 10℃. Therefore, this season is the turning point of climate change in many parts of China.

Cold dew solar terms, wet and cold qi is becoming more and more obvious, and the focus of health care should be to do a good job of preventing cold and evil qi. In addition, it is advisable to nourish yin in autumn. When the climate gets cold, the yang in the human body gradually converges, and the yin essence is hidden in the body. At this time, we must pay attention to nourishing yin essence.

Many diseases are closely related to damp and cold qi in human body. The aggravation of moisture in human body is easy to induce a series of diseases such as rheumatoid arthritis, cardiovascular and cerebrovascular diseases and gynecological diseases.

In addition, people's feet are an important part of cold entering the body. After the cold dew solar term, be sure to keep your feet warm, stop wearing sandals and slippers or walking barefoot on the floor, and add clothes in time according to the temperature change.