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The Double Ninth Festival is a traditional Chinese holiday observed on the ninth day of the ninth month in the Chinese calendar. According to Wu Jun, it dates back to the Eastern Han dynasty. According to the I Ching, nine is a yang number; the ninth day of the ninth month in the Chinese calendar has extra yang and is thus an auspicious date. Hence, the day is also called "Double Yang Festival" (重陽節). It is customary to climb a mountain, drink chrysanthemum liquor, and wear the zhuyu (茱萸) plant. Both chrysanthemum and zhuyu are considered to have cleansing qualities and are used on other occasions to air out houses and cure illnesses. On this holiday, some Chinese also visit the graves of their ancestors to pay their respects. In Hong Kong and Macau, whole extended families head to ancestral graves to clean them, repaint inscriptions and lay out food offerings such as roast suckling pig and fruit, which are then eaten. Chongyang cake is also popular and incense sticks are burned during the holiday.