Wood (wuxing) - Wikipedia In Chinese astrology, wood is included in the 10 heavenly stems (the five elements in their yin and yang forms), which combine with the 12 earthly branches (or Chinese signs of the zodiac), to form a 60 year cycle. Yang wood years end in four (e.g. 1974). Yin wood years end in five (e.g. 1975). Wood governs the Chinese zodiac signs Tiger and Rabbit. Some astrologers argue for …