one day.

Many zassetsu days occur in multiple seasons:
* refers to the 18 days before each season, especially the one before fall which is known as the hottest period of a year.
* is the seven middle days of spring and autumn, with Shunbun at the middle of the seven days for spring, Shubun for fall.
* is the day closest to Shunbun (middle of spring) or Shubun (middle of fall), which can be as much as 5 days before to 4 days after Shunbun/Shubun.

The term originally referred to the eves of , , , and ; however,

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