The Dōngzhì Festival or Winter Solstice Festival (Chinese: 冬至; Pinyin: dōng zhì; "The Extreme of Winter") is one of the most important festivals celebrated by the Chinese and other East Asians during the Dongzhi solar term on or around December 22 when sunshine is weakest and daylight shortest; i.e., on the first day of the Dongzhi solar term.
The origins of this festival can be traced back to the Yin and Yang philosophy of balance and harmony in the cosmos. After this celebration, there will be days with longer daylight hours and therefore an increase in positive energy flowing in. The philosophical significance of this is symbolized by the I Ching hexagram fù (复, "Returning").