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The traditional Chinese calendar divides a year into 24 solar terms. Lìdōng, Rittō, Ipdong, or Lập đông (Chinese and Japanese: 立冬; pinyin: lìdōng; rōmaji: rittō; Korean: 입동; romaja: ipdong; Vietnamese: lập đông; lit. 'start of winter') is the 19th solar term. It begins when the Sun reaches the celestial longitude of 225° and ends when it reaches the longitude of 240°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 225°. In the Gregorian calendar, it usually begins around November 7 and ends around November 22.

Lidong signifies the beginning of winter in East Asian cultures.

Pentads

• 水始冰, 'Water begins to freeze' – the initial stages of water bodies freezing over.
• 地始凍, 'The earth begins to harden'
• 雉入大水為蜃, 'Pheasants enter the water for clams'

Date and time

References

1. Guo, Rongxing (February 6, 2017). An Economic Inquiry into the Nonlinear Behaviors of Nations: Dynamic Developments and the Origins of Civilizations. Springer. pp. 160–161. ISBN 978-3-319-48772-4.
2. Martzloff, Jean-Claude (September 1, 2016). Astronomy and Calendars – The Other Chinese Mathematics: 104 BC - AD 1644. Springer. p. 64. ISBN 978-3-662-49718-0.

• Solar terms
• Winter time