Winter Solstice (冬至)
冬至 (Dōngzhì), the Winter Solstice solar term, falls around Dec 21-23. Dōngzhì is the 22nd of the 24 solar terms. In the northern hemisphere, it marks the period around the year's shortest daylight and longest night; in historical Chinese cosmology, it is described as yin at its peak with yang beginning to emerge.
Key Takeaways- Dōngzhì is the 22nd of the 24 solar terms.
- The winter-solstice point is 270° of solar longitude.
- Around the event, the northern hemisphere has its shortest daylight and longest night.
- Yin-and-yang language here describes historical cosmology, not medical advice.
Meaning and Significance
Dōngzhì (冬至), Winter Solstice, is the 22nd of the 24 solar terms. The Hong Kong Observatory places the winter-solstice point at 270° of solar longitude. Around this point, the northern hemisphere experiences its shortest daylight and longest night; the exact experience still depends on latitude.
The 24 solar terms divide the Sun's apparent annual path into 24 segments of 15°. UNESCO describes the system as knowledge developed through observing the Sun's motion and used to organize seasonal production and daily life.
In the Huainanzi's astronomical teaching, winter solstice is described through the language of yin reaching its fullness while yang begins to emerge. That is a historical cosmological description, not a modern medical or astronomical mechanism.
Customs associated with Dōngzhì vary by region, period, and family. This page therefore focuses on the calendar system, the astronomical event, and the historical language used to interpret it rather than presenting one menu or ritual as universal.
Sources and scope
This guide separates astronomical and historical claims from interpretation. The linked sources support the factual points above; regional customs are not presented as universal.
- UNESCO — The Twenty-Four Solar Terms
- Hong Kong Observatory — The 24 Solar Terms
- Chinese Text Project — Huainanzi: Astronomical Teachings
Frequently Asked Questions
What is Dōngzhì (冬至)?
Dōngzhì, or Winter Solstice, is the 22nd of the 24 solar terms. It identifies the winter-solstice point in the Sun's annual cycle and is placed at 270° of solar longitude.
How do the 24 solar terms work?
The system divides the Sun's apparent annual path into 24 segments of 15°. The terms were developed through observing the Sun's motion and became a seasonal timekeeping framework in China.
Why is Dōngzhì described as yin at its peak?
The Huainanzi's astronomical teaching uses yin-and-yang language to describe winter solstice: yin is at fullness and yang begins to emerge. This is a historical cosmological interpretation, not a medical claim.
Is Winter Solstice the shortest day everywhere?
Around the winter-solstice event, the northern hemisphere has its shortest daylight and longest night. Daylight patterns differ by hemisphere and latitude, so the statement is not universal worldwide.
Are Dōngzhì customs the same throughout China?
No single custom should be treated as universal. Dōngzhì practices vary by region, historical period, and family; this guide keeps those variations separate from the astronomical definition.
Seasonal links for Winter Solstice
Complete overview
Yin YangRelated concept
Five ElementsRelated concept
TaoRelated concept