Solar longitude
270°
Classification
Principal term · 气 qi
Month boundary
Does not open a month
Definition
What Winter Solstice marks
The season behind the name
Winter Solstice marks the Northern Hemisphere’s shortest daylight, followed by the gradual return of longer days.
The solar term sets the date of Winter Solstice; the festival adds its own customs and observances. Read the complete Winter Solstice guide, with its next date and traditions →
These names grew from seasonal observation and farming practice. They describe a traditional seasonal sequence, not a weather forecast for every region.
Winter Solstice begins at the instant the Sun reaches 270 degrees of apparent ecliptic longitude. It is one of 24 equal 15-degree divisions of the solar year, so its Gregorian position changes only slightly from year to year.
As a qi term, Winter Solstice marks the alternating mid-month point in the solar-term sequence. It does not open a solar branch month, and it does not open a lunar month.
The time is shown in China Standard Time (UTC+8). A reader west or east of that zone may see the same instant fall on a different local civil date.
Three pentads · 三候
Seasonal observations
Each traditional pentad spans about five days and names a seasonal sign associated with that part of the term.
- First pentad
Earthworms curl up
蚯蚓结
- Second pentad
Milu deer shed their antlers
麋角解
- Third pentad
Springs begin to flow
水泉动

