Corresponding solar terms in the twenty-four solar terms

Solar terms refer to the 24 solar terms and climate, which is a supplementary calendar invented by China in ancient times to guide farming. Because the lunar calendar in China is a kind of "yin and yang calendar", which is based on the movement of the sun and the moon, it can't fully reflect the solar cycle. But China is an agricultural society, and agriculture needs a strict understanding of the movement of the sun, so farming is entirely based on the sun. Therefore, the "twenty-four solar terms" that reflect the solar cycle alone are added to the calendar as the standard for determining leap months. China's orthodox twenty-four solar terms are based on Henan. The sundial originated in ancient China, and was measured by earth gauge. The longest annual sundial is defined as "sun solstice" (also known as long solstice, long solstice and winter solstice), and the shortest is "short solstice" (also known as short solstice and summer solstice). One day in spring and autumn is the same length of day and night, which is designated as "vernal equinox" and "autumnal equinox". There were only four solar terms in Shang dynasty, but it developed to eight in Zhou dynasty and was completely established in Qin and Han dynasties. In BC 104, the taichu calendar written by Deng Ping officially set 24 solar terms in the calendar, and defined the astronomical position of the 24 solar terms. . The names of the twenty-four solar terms first appeared in Tian Zi Xun of Huainan, and the concepts of Yin and Yang, four seasons, eight places, twelve degrees and twenty-four solar terms were also mentioned in Preface of Historical Records Taishi Gong. During the period of Emperor Wu of the Han Dynasty, Luo compiled solar terms into the calendar, stipulating that the month without neutral gas was the last month of leap month. Each of the 24 solar terms corresponds to a certain position reached by the sun every time it moves 15 on the ecliptic. The twenty-four solar terms are divided into 12 solar terms and 12 solar terms, which correspond to each other one by one. The twenty-four solar terms reflect the annual apparent motion of the sun, so their dates are relatively fixed in the Gregorian calendar. The solar terms in the first half of the year are on the 6th, the solar terms in the second half of the year are on the 8th and the solar terms are on the 23rd, with a difference of less than 1 ~ 2 days. The naming of the twenty-four solar terms reflects three seasons, climate phenomena and climate change. The reaction seasons are beginning of spring, Spring Equinox, Long Summer, Summer Solstice, beginning of autumn, Autumn Equinox, beginning of winter and Winter Solstice, also known as Eight; The response to climate phenomena is surprised, bright, full and mans; Rain, Grain Rain, little summer, big summer, early summer, white dew, cold dew, first frost, light snow, heavy snow, slight cold and severe cold are the responses to climate change. According to the position of the sun on the ecliptic, modern people have accurately determined the specific time of the twenty-four solar terms: in spring, the sun in beginning of spring is located at 3 15 degrees of the ecliptic, on February 2-5, the sun in rainy days is located at 330 degrees of the ecliptic, on February 18-20, the sun in thunder is located at 345 degrees of the ecliptic, and on March 5-20. The Qingming Sun is located at 0/5 degrees of the Yellow Meridian, April 4-6, Grain Rain Sun at 30 degrees of the Yellow Meridian, April 19-2 1, Long Summer Sun at 45 degrees of the Yellow Meridian, May 5-7, Xiaoman Sun at 60 degrees of the Yellow Meridian, and May 20-22. On June 5-7, the summer solstice sun is located at longitude 90 degrees, June 2 1-22, summer sun at longitude 105 degrees, July 6-8, summer sun at longitude 120 degrees, and July 22-24, beginning of autumn autumn sun at longitude/kloc. On August 7-9, summer sun is at longitude 150, August 22-24, dew sun is at longitude 165, September 7-9, autumnal equinox sun is at longitude 180, September 22-24, and dew sun is at longitude/kloc-0. The first frost sun is at 2 10 degrees on1October 8-9, the beginning of winter sun is at 225 degrees on1October 23-24, and the Xiaoxue sun is at 240 degrees1October 7-8. 65438+February 6-8, winter solstice sun at meridian 270 degrees, 65438+February 2 1-23, slight cold sun at meridian 285 degrees, 65438+1October 5-7, great cold sun at meridian 300 degrees, 65438+. In the solar terms (solar terms) of the month, qi (qi) is in the first month (yin). It rains (gross) in early February and spring. It wakes up at the vernal equinox in March. Grain Rain in April (April) is sunny. Long summer, full in May (noon). It grows on the solstice in summer (not in June). In summer, it is hot in July. Early autumn, August is summer. September is the millennium and the autumnal equinox.