Climate characteristics: Great heat means "extremely hot", which is the most intense and hottest solar term of the year. At this time, the direct sunlight point of the sun moves northward, and the solar radiation energy received by the northern hemisphere reaches its peak, and most parts of my country enter the "barbecue mode" and "steamer mode". At the same time, this solar term is around the "middle storm" in the "Door Day", and the "humid and heat exchange" reaches its peak. The weather is hot and humid, and thunderstorms and typhoons are frequent.
Three seasons of the solar term: According to the "Collected Explanations of the Seventy-Two Seasons of the Monthly Order", the third season of the Great Heat is "one is rotten grass and fireflies; the second is the soil moistens the heat; the third is the time of heavy rain." It means that during the Great Heat, the temperature is high and there is rain, bacteria grow, many dead plants are wet and corroded, and fireflies eggs are transformed, so the ancients believed that fireflies are transformed from rotten grass; then the soil is hot and humid, suitable for the growth of water-loving crops such as rice; finally, in this hot weather in the same season of rain and heat, rainfall will form in the sky at any time.
Impact on crops: Although the weather is hot during the Great Heat solar term, it is very conducive to crop growth, and crops grow the fastest during this period. High temperature and sufficient rainwater provide good growth conditions for water-loving crops such as rice, and are a critical period for rapid growth and development of crops.
Key points of health preservation: The Great Heat is the hottest and most humid season of the year. The focus of health preservation is "preventing heatstroke" and "removing dampness". At this time, the pores of the human body are opened and the yang energy floats over the surface, and the internal organs are relatively insufficient. It is also a key node in traditional Chinese medicine's "treatment of winter diseases and summer". It can adapt to the yang's excessive momentum to regulate and replenish the internal organs, and achieve the effect of "using heat to cure heat and expel evil spirits from going out".
