How are the 24 solar terms divided?

In our country's calendar, there are unique 24 solar terms, which are not available in other nationalities' calendars. As early as the Spring and Autumn Period and the Warring States Period, people in China had the concepts of Solstice in the South and Solstice in the North. Subsequently, people divided the year into 24 equal parts according to the relationship between the running position of the sun and the moon at the beginning and middle of the month and the natural utilization of weather, animal and plant growth, and gave each equal part a proper term, which is the 24 solar terms. Among the 24 solar terms, the six solar terms representing spring are beginning of spring, Rain, Scaring, Equinox, Qingming and Grain Rain. The representatives of summer are Changxia, Xiaoman, Mangzhong, Summer Solstice, brother-in-law and uncle; In autumn, there are beginning of autumn, first ripe, white dew, autumnal equinox, cold dew and first frost. The solar terms in winter include beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold; Each of these 24 solar terms has its own different meaning.

The division of the twenty-four solar terms fully considers the changes of natural phenomena such as solar terms, climate and phenology. Beginning of spring, Changxia, beginning of autumn, beginning of winter, vernal equinox, autumnal equinox, summer solstice and winter solstice in 24 solar terms are used to reflect the seasons. Among them, the vernal equinox, autumnal equinox, summer solstice and winter solstice are divided from the astronomical point of view, while beginning of spring, Changchun, beginning of autumn and beginning of winter reflect the beginning of the four seasons. There are four seasons and 24 solar terms in a year.

At present, the four seasons in China are divided into spring, summer, autumn and winter. That is, when the waiting temperature reaches 10℃ or above in the first half of the year, it is beginning of spring; When the waiting temperature reaches above 22℃, it is long summer; When the summer weather temperature drops to 22℃, it is autumn; When the temperature drops below 10℃, winter begins.