Solar Term Introduction: White Dew
White Dew is one of the 24 solar terms, occurring when the sun reaches 165 degrees of ecliptic longitude.White Dew is the fifteenth solar term in the "24 Solar Terms", the third solar term of autumn, indicating the end of the early autumn period and the beginning of the middle autumn period. "White Dew" is an important solar term reflecting changes in natural temperature.
The White Dew solar term basically ends the hot and muggy summer, marking the turning point from hot to cool in autumn.During the White Dew period, while the autumn wind cools down the temperature, it also dries up the moisture in the air. This dry climate characteristic is called "autumn dryness," and the climate feature of White Dew is dryness.
After the White Dew solar term, the autumn wind, while lowering the temperature, also dries out the moisture in the air. This dry climate characteristic is called "autumn dryness" in traditional Chinese medicine, and many people will experience symptoms such as dry mouth, dry throat, dry eyes, and dry skin.
The climate characteristics of White Dew are dryness. The "dew" in "White Dew" is a natural phenomenon. By this time, the daytime sunlight is still hot, and water vapor evaporates. When the sun sets, the temperature drops quickly, and at night, the moisture in the air condenses into small droplets, densely attaching to the green stems, leaves, or petals of plants and trees.
By the time of White Dew, we have truly entered the cool season. "White Dew basically ends the hot and muggy summer." Once entering "White Dew," there is a significant difference between day and night temperatures, and at night, you can feel a slight chill, clearly feeling that the cool autumn has arrived.
What Are the Three Phenological Signs of White Dew?
The Three Phenological Signs of White Dew: First, swallows arrive; second, the black-billed gulls return; third, flocks of birds store food.First sign: Swallows arrive: Birds fly from north to south, large ones are called "swallows" and small ones are called "geese."
Second sign: Black-billed gulls return: Swallows and other migratory birds fly south to avoid the cold.
Third sign: Flocks of birds store food: All kinds of birds start storing dried fruits and grains for winter.
The Three Phenological Signs of White Dew are described as follows: On the day of White Dew, swallows arrive; five days later, black-billed gulls return; five days after that, flocks of birds store food. In other words, each phenological sign lasts for five days. Since White Dew occurs between September 7th and 9th on the Gregorian calendar, we can calculate the time of each phenological sign by adding five days to this time.
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