What are the 24 solar terms? Is it regular?

The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After a week's operation, I returned to the vernal equinox, which is a tropical year with 360 degrees, so it is divided into 24 solar terms. The dates of solar terms are relatively fixed in the solar calendar. For example, beginning of spring in the solar calendar always falls between February 3rd and 5th. However, in the lunar calendar, the date of solar terms is not easy to determine. Take beginning of spring as an example. It can be the first day of the lunar calendar in the previous year, 65438+February 15, and the latest is the first month, 15. The current lunar calendar is neither a lunar calendar nor a solar calendar, but a combination of lunar and solar calendars. There is a leap month in the lunar calendar. If one year is counted from the first day of the first month to the New Year's Eve of the twelfth month, the number of days in the lunar calendar varies greatly (leap year is 13 months). In order to standardize the number of years, the first day of the Lunar New Year (heavenly stems and earthly branches) is not the first day of the first month, but beginning of spring. In other words, a year in the lunar calendar is the day before from beginning of spring in that year to beginning of spring in the following year. For example, 2008 is the year of Wuzi, and the first day of Wuzi is not February 7, 2008 (the first day of the first lunar month), but February 4, 2008. Season, month, solar terms, the sun reaching the Yellow Meridian, the first day, the second day and the third day (* * * 72 days) (compared with the year, month and day of AD) In spring, the east wind of beginning of spring, Meng Chun, 3 15 thawed the stinging insects and began to shake the fish on the ice. On February 3-5, it rained 330, flowers began to bloom, and the barn became a pigeon. February 18-20, the mid-spring fish stung and the wild geese sprouted. March 5-7, vernal equinox 0. On 38+0, the Ji Chun Qingming 15 bronze vole turned into a rainbow. From April 4th to 6th, Grain Rain sang a pigeon in his 30th birthday and brushed its feathers. Mulberry fall in April in Dai Sheng 19-2 1. In summer, Xia Meng Chang Xia sang Earthworms at the age of 45. Wang Gua was born on May 5th. Mantis is at 75 degrees. Mantis begins to sing, but its tongue is silent. On June 5-7, summer solstice, antlers were released at 90 degrees, and Pinellia began to sing. June 2 1-22, the summer heat in the last month is 105, and crickets live in eagles. July 6-8, Summer Heat 120. From 8+035 cool breeze to dew, cicadas are singing. On August 7-9, in the heat of 65438+ 050, the eagle bowed to the birds. On August 22-24, Mid-Autumn Festival Dew 165, geese came to Bailu to raise birds. September 7-9 autumnal equinox 180, thunder began to sting. 095 guest bird flood in Hongyan is clam chrysanthemum flower 65438+1early frost 2 10 jackal as a sacrificial animal and plant, yellow fall sting insect, salty immersion 65438+1October 23-24, winter, winter, beginning of winter. Adult winter165438+1October 22-23, the earth's atmosphere drops, and it snows in the middle of winter. Birds stopped singing and tigers began to have sex. Litchi stands at 65438+270 in the winter solstice from February 6 to 8, and moves at 65438+265438+265438 in the spring from February 0 to 23. 00 at the early stage of feeding, a bird suffering from serious diseases, Shui Ze abdominal stiffness 65438+1October 20th-21solar term date speed algorithm: the general formula of life-[y× d+c]-ly = year, D=0.2422, L= leap year, c. The C value of beginning of spring in this century is 4.475, and the date of beginning of spring in 20 17 is as follows: [2017× 0.2422+4.475]-[2017/4-15] = 492-489.