The official name of the festival Dongzhi Festival is Dongzhi (冬至) . annual is the frequency of this festival . On Winter solstice (between December 21 and December 23), Dongzhi Festival is celebrated . Chinese,Japanese,Koreans observe Dongzhi Festival festival . Marks the winter solstice are the significance of the Dongzhi Festival festival . Dongzhi Festival is of Cultural type . making and eating of tangyuan,ancestor worship are the observances in Dongzhi Festival . Winter solstice is related to Dongzhi Festival . Dongzhi Festival is also called Tang-cheh (冬節),Tōji (冬至),Dongji (동지)
The common name of Guru Poornima (Guru Worship on a Summer Full Moon day) is Dongzhi Festival