What is the date of 202 1 cold dew?

Cold dew is the seventeenth solar term among the twenty-four solar terms and the fifth solar term in autumn, which means fighting for Xin; Longitude of solar arrival195; On the 7th-9th day of the Gregorian calendar (10) every year, the cold dew is a festival in late autumn and the beginning of the full moon in the trunk calendar. The cold dew is a solar term reflecting the characteristics of climate change. When entering the cold dew, the cold air sometimes goes south, the temperature difference between day and night is large, and the autumn dryness is obvious.

After the cold dew, the cold air in the north has a certain influence. Most parts of China are controlled by cold and high pressure, and the rainy season is over. It's warm during the day, cool at night and often crisp in autumn during the day. From the climate characteristics, in the cold and dew season, autumn in the south is getting stronger, the air is cool and the rain is dry. The vast area in the north has shown the scene of winter.

Historical origin

Cold dew is the end of the full moon in the dry calendar and the beginning of the full moon. At night, looking up at the starry sky, you will find that the "Big Mars" (Antares), which represents midsummer, has set in the west. After the cold dew, the height of the sun continued to decrease and the temperature gradually decreased. Compared with the solar terms of the Millennium, cold dew is condensed, so it is called "cold dew". "Twenty-four solar terms" said: "In September, the dew is cold and will condense." At this time, the temperature is lower than when it is "white dew", with more dew and chill day and night.

There is a proverb in China called "Dew first turns white and then cold", which means that after the dew festival, the dew turns from a little coolness in early autumn to a little coolness in late autumn. There is also a proverb about dew: "Three dynasties are cold and dew, and you need to find a bridge after crossing the water", which means that the weather is already chilly and you can't wade across the river or go to the fields barefoot as before.

During the cold dew, people can obviously feel the change of temperature difference. From white and crystal dew to cold, it vividly reflects the continuous decline of temperature. With the increase of cold, everything is gradually bleak.