Lidong

{{Short description|Nineteenth solar term of traditional East Asian calendars}}

{{Use mdy dates|date=October 2011}}

{{Italic title|reason=:Category:Chinese words and phrases}}

{{Chinese

|c={{lang|zh|立冬}}

|l=start of winter

|p=lìdōng

|bpmf=ㄌㄧˋ ㄉㄨㄥ

|j=laap⁶ dung¹

|y=laahp dūng

|kanji={{lang|ja|立冬}}

|hiragana=りっとう

|romaji=rittō

|hanja={{lang|ko|立冬}}

|hangul=입동

|rr=ipdong

|chuhan={{lang|vi|立冬}}

|qn=lập đông

}}

{{solar terms}}

The traditional Chinese calendar divides a year into 24 solar terms. Lìdōng, Rittō, Ipdong, or Lập đông ({{CJKV|t=立冬|s=立冬|p=lìdōng|j=立冬|r=rittō|k=입동|rr=ipdong|v=lập đông|l=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.{{Cite book |last=Guo |first=Rongxing |url=https://books.google.com/books?id=Nz8UDgAAQBAJ |title=An Economic Inquiry into the Nonlinear Behaviors of Nations: Dynamic Developments and the Origins of Civilizations |date=2017-02-06 |publisher=Springer |isbn=978-3-319-48772-4 |pages=160–161 |language=en}}

Lidong signifies the beginning of winter in East Asian cultures.{{Cite book |last=Martzloff |first=Jean-Claude |url=https://books.google.com/books?id=SYj2DAAAQBAJ |title=Astronomy and Calendars – The Other Chinese Mathematics: 104 BC - AD 1644 |date=2016-09-01 |publisher=Springer |isbn=978-3-662-49718-0 |pages=64 |language=en}}