Is é Dashu an dara téarma gréine déag i measc na gceithre théarma gréine is fiche agus freisin an téarma gréine deireanach den samhradh. Douzhiwei, le domhanfhad gréine de 120 °, a cheiliúradh ó 22 Iúil go 24 i bhFéilire Gregorian. ‘Shu’ ciallaíonn te, agus 'Da Shu’ Tagraíonn an teas mhór de athlasadh. Tá an Teas Mór sách níos teo ná an Mionteas, agus is é an téarma gréine é leis an solas gréine is láidre agus is teo sa bhliain, le buaic na “gaileadh te agus tais” ag an am seo. Áirítear ar shaintréithe aeráide Dashu teocht ard, teas dian, stoirmeacha toirní go minic, 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. Freisin, 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 “agus” dispelling dampness “.