A woman with long white hair holding a cup of coffee

Lu，It is the third solar term in autumn，When the Sun reaches 165 degrees ecliptic longitude, it is white dew，It is celebrated on September 7-9 of the Gregorian calendar。The ancients used four hours with five elements，Autumn gold，Golden-white，Therefore, it is white to describe autumn dew。 "White dew" is an important solar term that reflects the growth of cold in nature。As the weather gradually cools，The sun is still hot during the day，But as soon as the sun goes down, the temperature drops quickly，The temperature difference between day and night widens。 Time to white dew，The summer wind is gradually being replaced by the winter wind，Cold air turns defense into attack，Plus the direct point of the sun moves south，The northern hemisphere has shorter sunshine hours，Light intensity decreases，Ground radiation dissipates heat quickly，Therefore, the temperature drop rate is gradually accelerating。Bailu basically ended the sweltering heat of the summer day，The weather is getting cooler，Cold and dewy。White dew season，The autumn breeze is cooling down at the same time，The moisture in the air is also dried，This dry climate is characterized by "autumn dryness"，The climate of Bailu is characterized by dryness。

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