Solar terms missed by Song Tanci?

Missed the slight summer heat and the great summer heat.

As a supplementary calendar in ancient China, solar terms 1 and 24 play an extremely important role in the traditional farming culture of China. They are the products of long-term observation and research on astronomy and meteorology by working people in ancient China, and contain the long-standing cultural connotation and historical accumulation of the Chinese nation.

2. In the 24 solar terms, there are not only phenological changes between cold and summer, but also changes in temperature and rainfall. Through it, the ancients can intuitively and clearly understand the changing law of seasonal climate in a year, so as to master the farming season and arrange farming activities reasonably. It not only plays a guiding role in agricultural production, but also affects the food, clothing, housing and transportation of ancient people, and even cultural concepts.

3. The apparent motion of the earth around the sun is 360 degrees, which is divided into 24 equal parts (initially divided into 12 equal parts), and each part of 15 degrees (about half a month) has a solar term. There are 24 solar terms throughout the year, namely: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, Dashu, beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Winter Solstice, Slight Cold, Heavy Snow.