Guyu

The traditional East Asian calendars divide a year into 24 solar terms . Gǔyù or more commonly pronounced as Gǔyǔ, or Kokuu is the 6^th solar term. It begins when the Sun reaches the celestial longitude of 30° and ends when it reaches the longitude of 45°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 30°. In the Gregorian calendar, it usually begins around April 20 and ends around May 5.

Pentads

Each solar term can be divided into 3 pentads . They are: first pentad , second pentad and last pentad . Pentads in Guyu include:

; China
* First pentad: 萍始生
* Second pentad: 鳴鳩拂其羽
* Last pentad: 戴勝降于桑

; Japan
* First pentad: 葭始生
* Second pentad: 霜止出苗
* Last pentad: 牡丹華