Spring rain surprises spring, clear valley, full summer, full summer and hot summer. What is this jingle about? When was it first determined in China?

Huainanzi, written by Liu An, King of Huainan in the Western Han Dynasty, is called the twenty-four solar terms.

Spring rain shocks spring and clear valley days, summer is full of mountains and summer is connected with heat, autumn dew is cold and frost, and winter snow drifts. The first half of the year is June 2 1 day, and the second half is August 23. The dates of the two festivals are fixed every month, with a maximum difference of one or two days.

There are 24 solar terms throughout the year, namely: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, Dashu, beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Winter Solstice and Slight Cold. The first four sentences are the main body of the solar term Song, and the last four sentences are the time law of the 24 solar terms.

The twenty-four solar terms were formulated by the ancients according to the ecliptic plane, which reflected the influence of the sun on the earth and belonged to the solar calendar category. It is an important part of the long history and culture of the Chinese nation and embodies the historical and cultural essence of Chinese civilization.

Twenty-four solar terms were established in ancient times, and were absorbed into taichu calendar law in Han Dynasty as a supplementary calendar to guide farming. Twenty-four solar terms are not only the time criterion promulgated by successive governments, but also the compass to guide agricultural production and to predict cold, warm, snow and rainy days in people's daily life.

In the field of international meteorology, the 24 solar terms are known as "the fifth invention of China". The lunar calendar used today has absorbed the "twenty-four solar terms" of the trunk calendar as a supplement to the calendar, and has been adjusted to conform to the tropic year through the "leap method" to form a combined calendar of yin and yang. 2016165438+1October 30th, 24 solar terms was officially listed in UNESCO? List of representative works of human intangible cultural heritage.