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Risshun (立春): February 4 - Beginning of spring

Keichitsu (啓蟄): March 5 - awakening of hibernated (insects)

Shunbun (春分): March 20 - Vernal equinox, middle of spring

Rikka (立夏): May 5 - Beginning of summer

Geshi (夏至): June 21 - Summer solstice, middle of summer

Risshū (立秋): August 7 - Beginning of autumn

Shūbun (秋分): September 23 - Autumnal equinox, middle of autumn

Rittō (立冬): November 7 - Beginning of winter

Tōji (冬至): December 22 - Winter solstice, middle of winter

Shōkan (小寒): January 5 - a.k.a. 寒の入り (Kan no iri)

Days can vary by ±1 day. See also: Jieqi.

Shanichi days can vary as much as ±5 days.

Chūgen has a fixed day. All other days can vary by ±1 day.

Many zassetsu days occur on multiple séasons:

Setsubun (節分) refers to the day before éach séason, or the eves of Risshun, Rikka, Rishū, and Rittō; especially the eve of Risshun.

Doyō (土用) refers to the 18 days before éach séason, especially the one before fall which is known as the hottest period of a yéar.

Higan (彼岸) is the seven middle days of spring and autumn, with Shunbun at the middle of the seven days for spring, Shūbun for fall.

Shanichi (社日) is the Tsuchinoe (戊) day closest to Shunbun (middle of spring) or Shūbun (middle of fall), which can be as much as  -5 to +4 days away from Shunbun/Shūbun.