What are the natural characteristics of the 24 solar terms?

Twenty-four solar terms are traditional folk festivals in China. As early as the Zhou Dynasty and the Spring and Autumn Period, the summer solstice, winter solstice, vernal equinox and autumn equinox were determined by measuring the sun shadow with soil gauge. Twenty-four solar terms mean dividing a year into twenty-four equal parts and giving each equal part a name. This is the origin of twenty-four solar terms. The names and order are: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Slight Summer, Great Summer, beginning of autumn, Early Summer, White Dew, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold. Each solar term is about half a month apart and divided into twelve months. The beginning of the month is called the solar term, and the middle of the month is called "Zhongqi". The so-called "qi" refers to meteorology and climate. Twenty-four solar terms are closely related to season, temperature, precipitation and phenology. Beginning of spring, Changxia, beginning of autumn and beginning of winter indicate the beginning of spring, summer, autumn and winter respectively, and the vernal equinox, autumnal equinox, summer solstice and winter solstice are the turning points of the season. The five solar terms of slight summer heat, great summer heat, summer heat, slight cold and great cold are the hottest and coldest periods; White dew, cold dew and first frost indicate that there is water vapor condensation in the lower atmosphere; It also reflects the degree of temperature drop. Rain, Grain Rain, light snow and heavy snow reflect the situation and degree of precipitation; Spine, clear, small full and awn grass are the characteristics of reactant climate and crop growth. Twenty-four solar terms are the result of long-term observation, exploration and summary of astronomy, meteorology and climate by laborers in China. They are the unique great scientific and technological achievements of China laborers. They have extensive application value in agricultural activities in rural areas of China, and are generally more suitable for agricultural activities in the Yellow River Basin. In order to facilitate memory, people compiled it into solar term song, and some even wrote a seven-character poem.