Solar terms with the largest temperature difference between day and night in the northern hemisphere

The solar term with the largest temperature difference between day and night in the northern hemisphere: Bailu.

Knowledge expansion:

Solar term is a special festival in the trunk and branch calendar that expresses the change of natural rhythm and establishes "December construction" (monthly order). The 24 solar terms are: beginning of spring, Rain, Sting, Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoxia, Daxia, beginning of autumn, Early Summer, Bailu, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

The twenty-four solar terms are related to cadres and gossip and have a long history. In the historical development, the 24 solar terms have been incorporated into the lunar calendar and become an important part of the lunar calendar.

"Twenty-four solar terms" is the product of ancient agricultural civilization and occupies an extremely important position in Chinese traditional agricultural society. Agricultural production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors who observed the movement of celestial bodies in agricultural time and realized the changing laws of one year, climate and phenology.

Scientifically reveals the law of astronomical and meteorological changes, skillfully combines astronomy, agriculture, phenology and folk customs, and derives a large number of related seasonal cultures.

The 24 solar terms in 20 1 16 were selected into UNESCO's representative list of intangible cultural heritage of mankind.

China's astrology culture has a long history and is profound. The ancients began to explore the mysteries of the universe very early, and thus deduced a complete and profound star-watching culture. "Twenty-four solar terms" is the product of ancient farming civilization, which has a long history and is associated with heavenly stems and earthly branches and Bagua. The age of early observation of images and timing was determined according to the changes of stars.

The Big Dipper is an important astrological sign in the Northern Hemisphere (China is located in the Northern Hemisphere). When the stars rotate, the natural rhythm of the corresponding areas in the Northern Hemisphere is gradually changing. The bucket handle cycle of the Big Dipper starts from the "Yin position" (the gossip position the day after tomorrow) due to the east and north, and then points to the twelve mornings in turn.

Tianwei Jianyuan started from Yin, and bucket handle started from the northeast (Yin position, acquired gossip position), turning clockwise, referring to the ugly side at the end of December and returning to Yin position in the first month; "bucket handle returns to Yin" and everything is renewed, thus opening a new cycle. Dou refers to yin as beginning of spring, dou refers to benevolence as rain, dou refers to Ding as fright, and dou refers to ugliness as cold.

During the period of Emperor Wu of the Western Han Dynasty, Twenty-four Solar Terms was absorbed into taichu calendar as a supplement to the Agricultural Calendar. In the Yellow River Basin, the day with the longest sun shadow and the shortest day (the shortest day) is defined as the winter solstice, and the winter solstice is the starting point of the "24 solar terms".

Divide the date between the winter solstice and the next winter solstice into twelve equal parts, which is called "Zhongqi", and then divide the time between adjacent "Zhongqi" into equal parts, which is called "solar terms".

On average, there is a "neutral gas" and a "solar term" every month, which are collectively called "24 solar terms". In order: winter solstice, slight cold, severe cold, beginning of spring, rain, fright, vernal equinox, Qingming, Grain Rain ... beginning of winter, light snow, heavy snow.