A solar term is any of twenty-four (24) periods in traditional East Asian lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon. The points are spaced 15° apart along the ecliptic and are used by lunisolar calendars to stay synchronized with the seasons, which is crucial for agrarian societies. The solar terms are also used to calculate intercalary months in East Asian calendars; which month is repeated depends on the position of the sun at the time.
On December 1, 2016, the Solar Terms were listed as UNESCO's Intangible Cultural Heritage.
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REF: Wikipedia, 中央氣象局數位科普網