Major Heat or "Dashu" in Chinese, is the 12th solar term. It usually arrives around July 22-24, and signals that most parts of China have entered the hottest season of the year. In classical Chinese, the character "Shu" was compared to "boiling", delivering an image that the earth is like a pot of boiling water during this time period.
24 Solar Terms -- Major Heat
Source : People's Daily | Editor : Song Duer