How to classify solar terms?

Reflect the season

Equinox (vernal equinox and autumnal equinox), Erzhi (summer solstice and winter solstice) and Li Si (beginning of spring, Changchun, beginning of autumn and beginning of winter).

Vernal equinox and Solstice are the turning points of the sun's height change and seasons. The four stands represent the beginning of the four seasons.

Reflect climate characteristics

Hot and cold: The five solar terms of slight summer heat, great summer heat, intense summer heat, slight cold and severe cold reflect the arrival of the hottest and coldest periods in a year and the changes of cold and summer heat.

Precipitation: The four solar terms of rain, Grain Rain, light snow and heavy snow indicate the time and intensity of precipitation and snowfall.

In addition, the three solar terms, White Dew, Cold Dew and First Frost, indicate the condensation and condensation of water vapor in the lower atmosphere, and also reflect the gradual decline of temperature and the degree of cooling in each solar term. First, the temperature began to drop, and more water vapor condensed; After that, the temperature dropped even more, not only exposed to the sun, but also cooled down, but it was not frozen; Finally, the temperature drops below zero degrees Celsius, and the water vapor condenses into frost. From the perspective of agricultural production, these three solar terms are concrete and vivid, with their heat meaning greater than their water meaning.

Reflect phenological phenomena

Xiaoman and Miscanthus reflect the maturity and harvest of related crops.

Frightening and Qingming reflect natural phenology, especially stinging. It uses the first thunder in the sky and the revival of underground stinging insects to inform everything in the world that spring is coming back to the earth.