Guyu

Solar term

Longitude	Term	Calendar
Spring
315°	Lichun	4 – 5 February
330°	Yushui	18–19 February
345°	Jingzhe	5 – 6 March
0°	Chunfen	20–21 March
15°	Qingming	4 – 5 April
30°	Guyu	20–21 April
Summer
45°	Lixia	5 – 6 May
60°	Xiaoman	21–22 May
75°	Mangzhong	5 – 6 June
90°	Xiazhi	21–22 June
105°	Xiaoshu	7 – 8 July
120°	Dashu	22–23 July
Autumn
135°	Liqiu	7 – 8 August
150°	Chushu	23–24 August
165°	Bailu	7 – 8 September
180°	Qiufen	23–24 September
195°	Hanlu	8 – 9 October
210°	Shuangjiang	23–24 October
Winter
225°	Lidong	7 – 8 November
240°	Xiaoxue	22–23 November
255°	Daxue	7 – 8 December
270°	Dongzhi	21–22 December
285°	Xiaohan	5 – 6 January
300°	Dahan	20–21 January

The traditional East Asian calendars divide a year into 24 solar terms (節氣). Gǔyù (pīnyīn) or more commonly pronounced as Gǔyǔ, Kokuu (rōmaji), or Gogu (romaja) (traditional Chinese and Japanese: 穀雨; simplified Chinese: 谷雨; Korean: 곡우; Vietnamese: Cốc vũ; literally: "grain rain") is the 6th 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

Date and Time (UTC)

year	begin	end
辛巳	2001-04-20 00:35	2001-05-05 10:44
壬午	2002-04-20 06:20	2002-05-05 16:37
癸未	2003-04-20 12:02	2003-05-05 22:10
甲申	2004-04-19 17:50	2004-05-05 04:02
乙酉	2005-04-19 23:37	2005-05-05 09:52
丙戌	2006-04-20 05:26	2006-05-05 15:30
丁亥	2007-04-20 11:07	2007-05-05 21:20
戊子	2008-04-19 16:51	2008-05-05 03:03
己丑	2009-04-19 22:44	2009-05-05 08:50
庚寅	2010-04-20 04:29	2010-05-05 14:44
辛卯	2011-04-20 10:17	2011-05-05 20:23
壬辰	2012-04-19 16:12	2012-05-05 02:19
癸巳	2013-04-19 22:03	2013-05-05 08:18
甲午	2014-04-20 03:55	2014-05-05 13:59

Source: JPL Horizons On-Line Ephemeris System

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 Guyu include:

China

• First pentad: 萍始生, 'Duckweed begins to sprout'.^[1]
• Second pentad: 鳴鳩拂其羽, 'Nahath shakes off wings'.^[1]
• Last pentad: 戴勝降于桑, 'Cuckoo perches in mulberry trees'.^[1]

Japan

• First pentad: Ashi hajimete shōzu (葭始生), 'Reed begins to bud'.^[2]
• Second pentad: Shimo yamite nae izuru (霜止出苗), 'Frost ends and rice seedlings to grow'.^[2]
• Last pentad: Botan hanasaku (牡丹華), 'Peony blooms'.^[2]

References

1. Kondō Heijō (近藤瓶城), ed. (1901). 新加纂録類 (Shinka Sanrokurui). 改定史籍集覧 (Kaitei Shiseki Shūran) 19. (Meiji 34) (Tokyo: 近藤活版所 (Kondō Kappansho)). p. 110.
2. Fujisawa Morihiko (1961). 年中行事編 (Nenjū Gyōjihen). 図説日本民俗学全集 (Zusetsu Nihon Minzokugaku Zenshū) 7 (Tokyo: Akane Shobō). p. 103.