Also known as: Rabbit Branch
Mao is yin wood, hidden stem 乙 alone — pure soft growing wood. It is the rabbit at sunrise, the equinox month, the cardinal east. Mao symbolizes elegance, refined sensitivity, beauty, and the social grace that flowers when conditions are just right. Mao Day Masters often have artistic taste, gentleness, and an instinct for harmonious relationships.
Mao san-he with 亥 and 未 transforms to wood (亥卯未合化木), and six-unites with 戌 to fire (卯戌合火). It is conflicted by 酉 (卯酉冲), forms the 子卯相刑 (the "punishment of irreverence"), and breaks with 辰 (卯辰相害).
Zi, Wu, Mao (卯 mǎo) and You form their own group in traditional spatial reasoning, the four cardinals, matching the Kan, Li, Zhen and Dui trigrams of the later-heaven arrangement and the four compass points. Mao sits due east, the gate the sun comes through; You sits due west, the gate it leaves by. The Mao-You line is read as the boundary between day and night, crossing the Zi-Wu axis at right angles to make the cross that frames the whole twelve-branch dial. Mao is not one slot among twelve but an endpoint of that frame.
The Mao month opens at Awakening of Insects and closes before Clear and Bright, with the spring equinox as its mid-term. The seventy-two pentad almanac records the equinox stretch as the swallows returning and the first thunder sounding, and the term itself is named for day and night coming out even. Taken together they describe the character of Mao: not a beginning, which belongs to Yin, and not a harvest, which belongs to Chen, but full extension at the point of balance. The tradition makes Mao the peak position of Yi wood for exactly this reason — wood here no longer struggles to survive and simply grows.
Mao carries an identity that is easy to overlook: it is the blade position of Jia wood. In the twelve-stage life cycle Jia reaches its peak in Mao, and the peak position of a yang stem is what the symbolic-star tradition calls the yang blade (羊刃 yángrèn). A Jia day master meeting Mao is classically read as strong, spirited and visibly edged, better with authority to restrain it and worse with further support. The very same Mao is a prosperity position for a Yi day master and a blade for a Jia one, with opposite handling. Ask whose chart it is before deciding what Mao does.
The standard slip in reading Mao is to take softness for weakness. Yi wood is soft in form, but Mao is where Yi wood is strongest, so softness describes shape and not force; the old image of a vine wrapping a tree is chosen precisely for the way pliancy defeats rigidity. A second slip treats the Mao and You clash as a verdict on relationships. That clash is the collision of due east with due west, read as upheaval, dispute and pulled loyalties, and where it lands depends on the pillar it sits in and the ten-god role it plays. Marriage is one possible address, not the only one.
The four cardinal branches also serve as the four peach-blossom positions, known as the Xianchi star. They are found from the harmony trios: for Yin-Wu-Xu the peach blossom is Mao, for Shen-Zi-Chen it is You, for Si-You-Chou it is Wu, for Hai-Mao-Wei it is Zi. So Mao is a peach-blossom position for people of tiger, horse and dog years, not for everybody who happens to have one. That is the rule most often misapplied. The classical sense is also broader than romance: being noticed, performing well, attracting help through connection.
The relations around Mao are not read uniformly. Zi and Mao punish each other without either union or clash between them, and the reasoning behind that has been explained in several ways; some lineages hold the force to be light and warn against heavy pronouncements. The Mao and Chen harm is a later addition to the harm set and receives little space in early material. Whether the Mao and Xu union actually transforms into fire again depends on season and on a stem to draw it out, and where it does not transform the pair merely bind. Naming the divergence beats imposing one formula.
The Mao double hour runs from 05:00 to 07:00, around sunrise. As a month Mao is the second month of the solar-term year, opening at Awakening of Insects and closing before Clear and Bright, and both correspondences share the image of light arriving and things opening up, which is why Mao is associated with due east. The spring equinox is not the same thing as the Mao month: it is the mid-term that falls inside it, roughly halfway through. In BaZi the month pillar changes at the sectional term, that is at Awakening of Insects, so the equinox marks the balance point within the Mao month.
Yin is yang wood at the very start of spring: cold not yet gone, momentum rising, and it hides fire and earth alongside its wood. Mao is yin wood at the height of spring, holding Yi alone, so it is purer and more concentrated but carries no warmth of its own. Yin is closer to initiative and expansion, Mao to growth, refinement and form. A chart that needs warmth prefers Yin; a chart that needs clean wood prefers Mao.
Only for some people. The peach-blossom star is derived from the harmony trio of the year or day branch, so Mao counts as peach blossom for those in the Yin-Wu-Xu group, that is tiger, horse and dog years. For other groups the position falls elsewhere. Classically the star describes visibility and charm broadly, covering being noticed and attracting support, and not romance alone.
Mao is due east and yin wood, You is due west and yin metal, so the clash sets the sprouting direction against the cutting one, and metal generally has the upper hand over wood. It is read as instability, revision and conflicting positions rather than as one fixed event. What area of life it touches is determined by which pillars the two branches occupy and what roles they play for the day master.