THE Beginning of Winter usually falls on November 7 or 8.In northern China,the temperature begins to drop below zero and water freezes;while in southern China,there is still a period of unseasonably warm called Indian Summer.This solar term is so important that since the Zhou Dynasty(1046-256 BC),the emperor and his civil and military officials would hold a ceremony on that day to offer sacrifices to Heaven,celestial beings,and ancestors,praying for a good harvest and a well-off life for his people.