Xià Zhì (Summer Solstice) is one of the 24 solar terms in the traditional Chinese lunisolar calendar, marking the day when the Northern Hemisphere experiences its longest period of daylight and shortest night—typically around June 21st. The character 夏 means 'summer', reflecting the season, while 至 means 'to arrive' or 'utmost', indicating the peak of summer’s heat and light. Together, they literally mean 'summer’s arrival at its height'.

This term is used in agricultural, cultural, and meteorological contexts. In ancient China, Xià Zhì was celebrated with rituals honoring the sun and Yang energy, and families often ate noodles or dumplings—a tradition symbolizing longevity and strength. Today, it remains a key reference point in farming calendars and seasonal health practices, such as adjusting diet and sleep to align with summer’s intense Yang energy.