Classification of solar terms in folk popular letters

From the meaning of solar terms, we can know that the 24 solar terms can be divided into four categories, namely: (1) beginning of spring and vernal equinox; Long summer, summer solstice; Beginning of autumn, autumnal equinox; Beginning of winter and Solstice are eight solar terms. (2) There are five solar terms symbolizing temperature change: slight heat, great heat, intense heat, slight cold and severe cold. (3) There are seven solar terms reflecting precipitation: rain, Grain Rain, white dew, cold dew, light snow and first frost and heavy snow. (4) There are four solar terms reflecting phenological phenomena or agricultural activities: fright, Qingming, Xiaoman and Miscanthus.