Yushui

The traditional East Asian calendars divide a year into 24 solar terms . Yǔshuǐ or Usui is 2^nd solar term. It begins when the Sun reaches the celestial longitude of 330° and ends when it reaches the longitude of 345°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 330°. In Gregorian calendar, it usually begins around February 18 and ends around March 5.

Pentads

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

; China
* First pentad: 獺祭魚
* Second pentad: 鴻雁來
* Last pentad: 草木萌動

; Japan
* First pentad: 土脉潤起
* Second pentad: 霞始靆
* Last pentad: 草木萠動