specially-named days or indicating the start and end of each. This system was adapted from the Chinese in 1685 by court astronomer Shibukawa Shunkai, rewriting the names to better match the local climate and nature in his native Japan. Each ko has traditional customs, festivals, foods, flowers and birds associated with it:

The 24 sekki

Zassetsu

is a collective term for special seasonal days within the 24 sekki.

Shanichi dates can vary by as much as 5 days. Chugen has a fixed day. All other days can vary by

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