What is the traditional meaning of the twenty-four solar terms?

Beginning of spring, Changxia, beginning of autumn, beginning of winter, vernal equinox, autumnal equinox, summer solstice and winter solstice are used to reflect the four seasons. Beginning of spring, Changchun, beginning of autumn and beginning of winter reflect the beginning of spring, summer, autumn and winter. The vernal equinox, autumnal equinox, summer solstice and winter solstice are divided from an astronomical point of view, reflecting the turning point of solar height change. Equinox: Mid-spring, divided equally between day and night. Summer solstice: the longest day and the shortest night. Autumnal equinox: In the middle of the autumnal equinox, it is divided equally between day and night. Winter solstice: the day enters nine o'clock, the day is short and the night is long. Because China has a vast territory and a very obvious monsoon and continental climate, the weather and climate vary greatly from place to place, so the seasonal changes in different regions are also very different.

The five solar terms of slight summer heat, great summer heat, intense summer heat, slight cold and severe cold reflect the change of temperature and are used to indicate the degree of heat and cold in different periods of the year. Slight heat: Before and after the first lodging, the climate began to get hot. Summer: the hottest season of the year. Summer: "out" means hiding and ending, indicating that the summer heat is about to pass. Xiao Han: The climate is already cold. Great cold: It is the coldest season.

The three solar terms, White Dew, Cold Dew and First Frost, on the surface reflect the phenomenon of water vapor condensation, but in essence, they reflect the process and degree of gradual temperature drop. Millennium: The temperature drops to a certain extent, it is cooler at night, and the water vapor in the air condenses. Cold dew: the temperature drops obviously, and the condensation increases at night, getting colder and colder. First frost: frost begins. When the temperature drops below 0℃, water vapor condenses into frost.

Xiaoman and Miscanthus reflect the maturity and harvest of related crops. Xiaoman: The seeds of summer hot crops such as wheat are gradually full. Miscanthus species: Miscanthus crops such as wheat are mature.

Surprise and clarity reflect natural phenology. Sting: It started to thunder, and the hibernating animals woke up. Qingming: The climate is warm and the sky is clear. In particular, it uses the early thunder in the sky and the resurrection of underground stingers to predict the return of spring.

The four solar terms of rain, Grain Rain, light snow and heavy snow reflect the phenomenon of precipitation, indicating the time and intensity of rainfall and snowfall. Rain: It's starting to rain. Grain Rain: Increased rainfall is beneficial to grain growth. Xiaoxue: It's starting to snow. Heavy snow: It snows heavily.