Characteristics of cold dew or completeness of first frost

Cold dew is the17th solar term among the 24 solar terms, and it is also the end of the full moon and the beginning of the full moon. The time point is when the sun reaches the longitude 195 (within Virgo) on the 8th or 9th of October every year in the Gregorian calendar. "Twenty-four solar terms" said: "In September, the dew is cold and will condense." Cold dew means that the temperature is lower than that of the white dew, and the dew on the ground is colder and will soon condense into frost. In the cold dew season, Nanling and the vast area to the north have entered autumn, and the northeast and northwest regions have entered or are about to enter winter.

On this day, the daytime in Beijing has been shortened to 1 1 hour 29 minutes, and the sun height at noon has dropped to 44 09'. After the cold dew, the height of the sun continued to decrease and the temperature gradually decreased. White dew, cold dew and first frost all indicate the phenomenon of water vapor condensation, and cold dew is the transition from cold to cold. At night, looking up at the starry sky, you will find that the season of the starry sky changes, and the "Big Mars" (Scorpio Antares), which represents the midsummer, has set in the west. We can vaguely hear the footsteps in winter. Its main feature is that the temperature drops and the dew is cooler.

The first frost, one of the 24 solar terms, is around 65438+1October 23rd every year. The first frost solar term means that the weather is getting colder and the first frost appears. It is the last solar term in autumn and also means the beginning of winter. Health care is particularly important in the first frost season. There is a folk proverb that "it is better to make up the first frost one year", which shows the influence of this solar term on us. It is characterized by cold weather and dew condensation into frost.