Solar terms to commemorate the ancestor of Chinese characters

The solar term commemorating the ancestor of Chinese characters is Grain Rain. According to Huainanzi, in the late spring and early summer, the Yellow Emperor issued a letter announcing the success of Cangjie's word-making and calling on his subjects to do it. On this day, an unusual rain fell, and countless Gu Mi fell to comfort this sacred work. Later generations named this day "Grain Rain", which is now the solar term in Grain Rain.

The most important feature of Grain Rain is the continuous spring rain, which embodies the significance of "Grain Rain" in agricultural climate and is also the reflection of ancient farming culture on festivals. After the solar term in Grain Rain, the temperature rises, the rainfall increases, and the humidity in the air further increases, which is very suitable for the growth of cereal crops.

In Grain Rain season, in the south of China, "a hundred flowers blossom", willow leaves fall, cuckoo cries at night, peony bloom and cherry ripens. The natural scenery tells people that it is late spring. At this time, the temperature in the south rises rapidly. Generally, the average temperature in late April has reached 20℃~22℃, which is more than 2℃ higher than that in mid-April, except for parts of northern and western South China. In the eastern part of South China, there is often a high temperature above 30 for a day or two, which makes people feel very hot. Low-altitude valley areas have also entered summer.