The summer solstice is one of the 24 solar terms, usually between June 20th and 22nd every year. The summer solstice is the longest day and the shortest night in a year, and it is also the time when summer officially begins.

The summer solstice was regarded as an important festival in ancient China. People held various celebrations, such as offering sacrifices to the sun, dragon boat races and eating zongzi. The summer solstice is also an important time for farmers, who will arrange farming activities according to the time of the summer solstice, such as harvesting wheat and transplanting rice.