Why are there "first half" and "second half" in the 24 solar terms?

It means that 65438+10-June is the first half of the year and July-65438+February is the second half. In the first half of the year, 2 1 is a solar term every 6 days, and in the second half of the year, it is a solar term every 8 days and 23 days, with a general difference of one or two days.

Twenty-four solar terms were summed up by the working people in ancient China, which reflected the law of the solar cycle, and the ancients carried out agricultural activities accordingly. On May 20th, 2006, "Twenty-four solar terms" as a folk custom project was approved by the State Council to be included in the first batch of national intangible cultural heritage list.

2016165438+130 October, UNESCO officially passed a resolution to include the "Twenty-four solar terms-the time knowledge system formed by China people through observing the anniversary movement of the sun and its practice" declared by China in the UNESCO representative list of human intangible cultural heritage.

Twenty-four solar terms guide traditional agricultural production and daily life, and are known as "the fifth great invention of China".

Each of the 24 solar terms is separated by about half a month, divided into twelve months, and each month has two solar terms. Among the 24 solar terms, "festival" refers to a period of a year, which is a representation of a period of time.

And "qi" refers to climate, which is an overview of weather changes. It is the name given by the ancients according to the unique climate or phenology phenomena and agricultural activities in each stage. Together, these two words refer to the weather changes at a certain stage of the year.

12 solar terms, including beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, heavy snow and slight cold; The second solar term of each month is "Zhongqi", that is, there are 12 solar terms such as rain, vernal equinox, Grain Rain, Xiaoman, summer solstice, great heat, intense heat, autumnal equinox, first frost, light snow, winter solstice and great cold.

"Solar term" and "neutral qi" appear alternately, each lasting 15 days. Now people have called "solar terms" and "neutral gas" as "solar terms", that is, 24 solar terms.