Xiazhi is which numbered solar term in traditional East Asian calendars? The 10th.
Xiazhi is the 10th of the 24 solar terms used in traditional East Asian calendrical systems. It marks the summer solstice, when the Sun reaches a celestial longitude of 90 degrees. In the Gregorian calendar, Xiazhi generally begins around June 21 and continues until Xiaoshu, the “Minor Heat” term, begins around July 7.
The 24 solar terms divide the Sun’s apparent annual path into equal 15-degree segments. Unlike ordinary lunar-month labels, they are tied to the solar year, making them useful for seasonal agriculture and weather expectations. Xiazhi is therefore a seasonal marker, not simply another name for a lunar date.
The term is sometimes confused with the winter solstice term Dongzhi, which is the 22nd solar term. Xiazhi historically had regional foods and customs, including eating noodles in parts of China; a common saying contrasts noodles at Xiazhi with dumplings at Dongzhi. Each solar term can also be subdivided into three pentads, creating finer traditional observations of seasonal change.