The traditionalChinese calendar divides a year into 24solar terms.Lìdōng,Rittō,Ipdong, orLập đông (Chinese andJapanese: 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 thecelestial 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 theGregorian calendar, it usually begins around November 7 and ends around November 22.^[1]

Lidong signifies the beginning of winter in East Asian cultures.^[2]

• 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'

• Samhain

• Solar terms
• Winter time

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