Dashu adalah istilah suria kedua belas di antara dua puluh empat syarat suria dan juga tempoh solar terakhir musim panas. Douzhiwei, dengan bujur suria 120 °, dirayakan dari 22 hingga ke -24 Julai dalam kalendar Gregorian. 'Shu’ bermaksud panas, dan 'da shu’ merujuk kepada haba yang melampau keradangan. Panas yang hebat agak panas daripada panas kecil, Dan ia adalah istilah suria dengan cahaya matahari yang paling kuat dan paling hangat pada tahun ini, dengan puncak “mengukus panas dan lembap” Pada masa ini. Ciri -ciri iklim Dashu termasuk suhu tinggi, Panas yang sengit, ribut petir yang kerap, 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. Sebagai tambahan, 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 “dan” dispelling dampness “.