Jisho

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じゅうせっ 二十四節気
Noun
1. 24 divisions of the solar year; 24 terms used to denote the changing of the seasons
Wikipedia definition
2. Solar termA solar term is any of 24 points 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.
Read “Solar term” on English Wikipedia
Read “二十四節気” on Japanese Wikipedia
Read “Solar term” on DBpedia

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