Dashu é o décimo segundo termo solar entre os vinte e quatro termos solares e também o último termo solar do verão. Douzhiwei, com uma longitude solar de 120 °, é comemorado de 22 a 24 de julho no calendário gregoriano. ‘Shu’ means hot, and ‘Da Shu’ refers to the extreme heat of inflammation. O grande calor é relativamente mais quente que o calor menor, E é o termo solar com o sol mais forte e mais quente do ano, com o pico de “quente e úmido fumegante” Neste momento. As características climáticas do Dashu incluem altas temperaturas, calor intenso, Tempestades frequentes, 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. Além disso, 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 “e” dispelling dampness “.