Is there an order in the arrangement of the 24 solar terms in a year? How many days is a solar term?

There is no order in the arrangement of 24 solar terms in a year. Every15th day is a solar term.

It is formulated according to the change of the earth's position on the ecliptic (that is, the earth's orbit around the sun), and each solar term corresponds to a certain position that the earth reaches every time it runs 15 on the ecliptic.

Twenty-four solar terms are a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year. It divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with the great cold.

The 24 solar terms are: beginning of spring, rain, fright, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Slight Summer, beginning of autumn, Early Summer, Millennium, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Great Cold.

Extended data:

source and course

The complete name of the 24 solar terms was first found in the book Huainanzi Astronomical Training written in the Western Han Dynasty. Its official inclusion in the calendar began with the publication of taichu calendar in the first year of Emperor Wu of the Han Dynasty, which is strictly speaking the birth time of the 24 solar terms.

As a calendar originated in China, the 24 solar terms have been used continuously for more than 2 100 years. The division of time depends only on climate and phenology, without the help of abstract figures. The twenty-four solar terms have been used for a long time and covered a wide range, which can be described as a wonderful work in the history of world civilization. Some people even call it the "fifth great invention" besides the four great inventions in China.

In June 2006, the 24 solar terms were selected as the first batch of national intangible cultural heritage (hereinafter referred to as "national intangible cultural heritage"). 2016165438+1October 30th, 24 solar terms were included in the UNESCO representative list of human intangible cultural heritage.

References:

Baidu encyclopedia-24 solar terms