Climatic characteristics of the Millennium

Climatic characteristics of the Millennium:

After the meteorological change entered the Millennium solar terms, the summer monsoon was gradually replaced by the winter monsoon, and the cold air gradually moved southward. In addition, the position where the sun directly touches the ground moves south, so the sunshine time in the northern hemisphere becomes shorter and the sunshine intensity weakens. At night, it is often partly cloudy and sunny, and the ground radiation dissipates quickly, so the temperature drops gradually. There used to be a saying that "it's a thousand years' autumn night, and it's cool all night". After the Millennium, the temperature difference between day and night gradually widened. Although the temperature is high at noon during the day, it is already very cold in the morning and at night.

Millennium is the15th solar term in the "twenty-four solar terms", and the third solar term in autumn is the end of the application of the moon in the lunar calendar and the beginning of the unitary month. Fighting fingers; The sun reaches longitude 165 degrees; Gregorian calendar September 7-9. "White dew" is an important solar term reflecting the growth of cold in nature. As the cold air turns to attack, it is sunny and hot during the day, but the temperature drops rapidly after the evening, and the temperature difference between day and night gradually widens.

During the white dew, the summer monsoon is gradually replaced by the winter monsoon, and the cold air changes from defense to attack. In addition, when the direct point of the sun moves south, the sunshine time in the northern hemisphere becomes shorter, the light intensity weakens, and the ground radiation dissipates heat quickly, so the cooling speed gradually accelerates. The Millennium basically ended the sweltering heat in summer, and the weather gradually turned cold, and the cold gave birth to dew condensation. The ancients used four seasons to match five elements. Autumn belongs to gold, gold and white alternate with each other, and autumn dew is described in white, hence the name "White Dew".

According to the standard of "average climate temperature" put forward by modern scholar Zhang Baokun, the average climate temperature is 10-22℃ in spring or autumn. According to this standard, from the beginning of the Millennium solar term, all localities began to enter autumn one after another. As the saying goes,' the Millennium reveals itself'. It is said that the weather is bad enough to give clothes and ears. "It is intended to remind people that it is still hot during the day, but it is already cold in the morning and evening, and it is easy to catch cold when going shirtless. In addition, we should prevent autumn dryness at this time.