Major Heat or Dashu in Chinese, is the 12th solar term, whose arrival symbolizes 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.   Three Phenomena Fireflies illuminate summer nights Ancient Chinese found that fireflies usually appeared when Dashu began. They believed that fireflies were born out of decayed grass, and would come out to illuminate the sky of summer nights like shining stars.

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