The significance of the Millennium to autumn is strong.

"The Millennium is coming and autumn is strong" means that once the Millennium solar term has passed, the coolness of autumn will gradually become stronger.

First, the Millennium solar terms:

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.

Second, the meteorological changes:

After entering the Millennium solar terms, the summer monsoon is gradually replaced by the winter monsoon, and the cold air gradually moves southward frequently. In addition, the position where the sun directly touches the ground moves south, and 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 drop is gradually accelerated. There is a saying called "Qiu Qiu in a thousand years, it is cold 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. According to the standard of "average weather temperature" proposed by modern scholar Zhang Baokun, the average weather 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.

At this time, the temperature difference between day and night in China can reach 8℃- 16℃, so the Millennium is a solar term with a large temperature difference in a year.

Introduction of 24 solar terms:

1 and 24 solar terms are:

Beginning of spring, Rain, Creeping, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, Dashu, beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew, Chufrost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

Among the solar terms, beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, Daxue and Xiaohan are silver moon, Uzuki, Chen Yue, Mitsuki, Wuyue, Yue Wei, Shenyue, Youyue, Moon, Haiyue, Ziyue and Ugly Moon.

2. Climate type:

Twenty-four solar terms are the product of agricultural civilization and the knowledge system formed by ancient ancestors by observing celestial movement combined with geographical climate and phenological laws. Agricultural production is closely related to geographical and climatic resources, and superior geographical and climatic resources are important conditions for the birth of agricultural civilization.

China is located in the east of Asia-Europe continent and the west coast of the Pacific Ocean, with great differences in thermal properties between land and sea, forming the most typical monsoon climate in the world. Monsoon climate is a mixture of continental climate and maritime climate.

In winter, affected by the dry and cold air flow in the inland, the weather is cold, dry and rainy; In summer, it is hot, humid and rainy because of the warm and humid air currents in the ocean. Sufficient sunshine, abundant precipitation, high temperature and humid rain and heat coexist, which is a very superior climate resource in China. The high temperature period is consistent with the rainy season, and the water and heat are well coordinated, which is very beneficial to the growth of crops.

Climate elements include light, temperature and precipitation, among which precipitation is an important element of climate. Twenty-four solar terms accurately reflect the changing law of natural rhythm and play an extremely important role in ancient agricultural production.