What about the autumnal equinox in the twenty-four solar terms?

1, "Spring and Autumn Annals" records: "The autumn equinox, Yin and Yang are also half-phase, so day and night are cold and summer." In astronomy, the autumnal equinox is considered as late summer and early autumn. To be exact, autumn in the northern hemisphere begins at the autumnal equinox. At this time, most parts of our country have entered the cool autumn, and the cold air from the south meets the gradually decaying warm and humid air, resulting in repeated precipitation and temperature drop. As people often say, it's time for "an autumn rain and a cold", but the daily precipitation after the autumnal equinox will not be great. At this time, the field farming in the south and the north is different.

2. In the north of China, there is an agricultural proverb that says: "The white dew is early, the cold dew is late, and it is the right time to plant wheat in the autumn equinox." Proverbs clearly stipulate the sowing time of winter wheat in this area; And "White clouds come in autumn equinox, good songs and good rice seeds are everywhere" reflects the planting time of rice in Jiangnan area. In addition, the working people's taboos on the autumnal equinox solar terms are also summarized as proverbs, such as "The autumnal equinox is only afraid of lightning, how much is it?"

3. Because the autumnal equinox solar term has really entered the autumn, as a solar term with equal time between day and night, people should also keep their bodies according to the law of balance between yin and yang in health care and the principle of "both yin and yang are secret", and according to the theory of Su Wen's "On the Truth", "carefully observe the place of yin and yang and wait for the flat period", and the yin and yang can not be biased.