What do the 24 solar terms refer to in Song Dynasty?

Spring rain shocks the spring and the valley days (meaning beginning of spring, rain, fright, vernal equinox, Qingming and Grain Rain).

Summer people are related to summer heat (meaning long summer, small full, boundless middle, summer solstice, light summer and great summer).

Autumn dew and autumn frost (meaning beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew and Chufrost),

Snow in Winter There are mild and severe cold in winter (meaning beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold).

The two solar terms will not change every month (meaning that the two solar terms will not change every month).

There will be a difference of one or two days at most (meaning that there will be a difference of one or two days on a specific day).

The first half of the year is June 2 1 day (meaning that the solar terms in the first half of the year are around 6 and 2 1).

The second half of the year is August 23rd (meaning that the solar terms in the second half of the year are around August 23rd).

The current 24 solar terms take the earth's revolution around the sun as a cycle, which basically summarizes the laws of natural phenomena such as the different positions of the sun on the ecliptic at different times of the year, the accurate time of cold coming and summer going, rainfall and snowfall. It began in the beginning of spring and ended in the great cold.