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The traditional East Asian calendars divide a year into 24 solar terms (節氣). Yǔshuǐ (pīnyīn) or Usui (rōmaji) (Chinese and Japanese: 雨水; Korean: 우수; Vietnamese: Vũ thủy; literally: "rain water") 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 (February 19 East Asia time) and ends around March 5.

[edit] Pentads

Each solar term can be divided into 3 pentads (候). They are first pentad (初候), second pentad (次候) and last pentad (末候). 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