Xiazhi

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''Xiàzhì'' is the 10th solar term, and marks the summer solstice, in the traditional Chinese lunisolar calendar dividing a year into 24 solar terms.

It begins when the Sun reaches the celestial longitude of 90° and ends when it reaches the longitude of 105°. The word ''xiazhi'' most often refers specifically to the day when the Sun is exactly at the celestial longitude of 90°. In the Gregorian calendar, this is around 21 June, and the Xiazhi period ends with the beginning of the next solar term, Xiaoshu, around 7 July.

Xiazhi is considered the middle of the summer and the beginning of the hottest part of summer. Although it was once celebrated with traditional customs, these customs have mostly died out, and Xiazhi is not observed much anymore. Provided by Wikipedia