Dashu是二十四个太阳能期间的第十二个太阳能期，也是夏季的最后一个太阳能期限. Douzhiwei, 太阳经度 120 °, 从7月22日至24日在格里高利日历中庆祝. ‘Shu’ means hot, and ‘Da Shu’ refers to the extreme heat of inflammation. 大热量比次要热量相对热, 这是年度最强烈，最热的阳光的太阳能术语, 与 “热潮气” 此时. Dashu的气候特征包括高温, 强烈的热量, 频繁的雷暴, and typhoons.
The Dashu solar term falls around the middle of the “Sanfu” period, which is the hottest time of the year. During the Great Heat season, the sunshine is intense, the temperature is high, humid, and rainy. Although there may be unbearable heat and humidity, it is very beneficial for the growth of crops, and crops grow the fastest during this period.
Since ancient times, there has been a custom among the people to drink herbal tea (Fucha) during the three days of the Great Heat; Fucha, as the name suggests, is a type of tea consumed during the Sanfu period. This tea, brewed with traditional Chinese herbs, has a cooling and heat relieving effect. 此外, there are customs such as burning incense and sun drying ginger. Dashu “is the hottest and most humid season of the year, during which the focus of health and wellness is on” preventing heatstroke “和” dispelling dampness “.