하지 (Winter Solstice) is an important solar term in the traditional East Asian calendar, marking the shortest day and longest night of the year. It usually occurs around December 21 or 22. This day signifies the turning point when days begin to lengthen, symbolizing the return of light and warmth. In many cultures, including Korea, China, and Japan, various customs and rituals are observed during 하지. People often celebrate by eating special foods, such as red bean porridge in Korea, which is believed to ward off misfortune and bring good luck for the coming year.