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Chapter 15 of 15
星学大成
The Twenty-Eight Mansions are distributed among different palace degrees. Each mansion has its primary star's Five Element, yet this is not fixed but dynamically shifts according to season (monthly orders), day or night, and palace position. Below is an interpretation of each:
The Horn Mansion belongs to Wood 🌱, originating in the Chen Palace. In spring, Wood's qi prevails; in autumn, Metal's qi prevails. This mansion does not fear Metal stars coming to overcome it, but within the limiting cycles, it most fears Mars and Rahu coming to disturb it.
The Neck Mansion has always belonged to the Metal ⚙️ enclosure, receiving complete qi nourishment throughout all four seasons. It most dreads Mars and Rahu as malefic thieves; if they coincide with baleful regions, it portends an untimely death.
Throughout the four seasons, the Di Palace is treated as Earth ⛰️; at other times, it is considered as Fire 🔥. It does not fear Wood qi as an inauspicious luminary, but Mercury and Moon's Veil (Yuebei) traversing together with it portend a difficult fate. In summer months, Fire accompanies it; in Chen, Xu, Chou, and Wei months, it is treated as Earth.
The Fang mansion, belonging to the Sun, is originally a Fire 🔥 palace, and most resents Mercury and Moon's Veil harming its substance. If suddenly met with Wood qi 🌱 in the life-limit, it portends accumulation of wealth and flourishing blessings.
The Heart mansion originally belongs to the Mao Palace. Those born in daylight share the same nature as Fire. Those born at night are treated as Moon 🌙, requiring careful discernment to judge fortune or misfortune. The Heart mansion is residual Fire qi; waxing and waning moons must be weighed against the lunar phase.
All four degrees of the Tail mansion belong to Fire 🔥; when traversing to the Yin Palace, it is reckoned as Wood 🌱. Wood fears Metal stars, Fire fears Water stars—each distinction is clear. Water and Earth meeting brings blessings, while Qi Star and Venus meeting brings calamities that cling to one another.
The first degree of the Ji mansion belongs to Wood 🌱, the remaining degrees to Water 🌊. Saturn and Ketu traveling together act as baleful demons. In spring, it must be examined as Wood; one cannot uniformly judge life and death.
The four degrees of the Dou mansion in the Yin Palace are true Wood 🌱; in the Chou Palace, Wood and Earth are both involved. In the remaining seasons of the year, all is treated as Earth ⛰️; only those born in spring are considered as Wood. From the fourth through the tenth degree of Dou, spring births are reckoned by Wood; other seasons, along with the entire Ox mansion, are treated as Earth.
The Ox star originally is not a true star; when it traverses into the Chou Palace, it transforms into Saturn ⛰️. Yet it delights in Mars and Rahu coming to overcome it (Earth is generated by Fire); when the limit encounters Wood qi 🌱, it invariably harms the body (Wood overcomes Earth).
The Xu mansion traverses as Earth ⛰️; when Water qi meets it, loss and bereavement are certain. If it encounters Mars and Rahu, it can bring fortune—one must discern carefully without hesitation.
The first five degrees of the Wei mansion are Earth ⛰️; after the twelfth degree, it is considered as Great Yin (Moon) 🌙. If born in seasonal months, all is treated as Earth; day and night require careful examination. In seasonal daylight births, it is Earth; in night births, it is Moon.
All eighteen degrees of the Shi mansion belong to Water 🌊; Saturn can also bring it blessings. If Mars and Rahu are encountered, they destroy wealth; when the limit runs into Qi Star and Venus, these are true baleful influences.
The Bi mansion certainly belongs to Water 🌊; when Saturn and Ketu travel together, the road of the limit becomes rugged. Mars and Rahu forming a faction brings harm to the six relatives—husband harms wife, wife harms husband.
The second degree of the Kui mansion in the Hai Palace is true Wood 🌱; in the Xu Palace, Wood and Fire seek each other alternately. Even if encountered in spring birth, it is treated as Wood; when the limit runs into Mercury and Moon's Veil, disasters and intrusions also occur.
The Lou mansion in the Xu Palace is the god of the proper palace—not Venus but Mars 🔥. It does not fear Fire and Rahu overcoming it, but resents Mercury and Moon's Veil harming its substance.
All four degrees of the Wei mansion belong to Earth ⛰️; in the You Palace, Metal and Earth are clearly distinguished. If born in seasonal months, all is treated as Earth; in the flourishing autumn season, the remaining time is viewed only as Metal ⚙️.
Mao is a Metal ⚙️ mansion; when Saturn and Ketu meet it, the five blessings are complete. It only fears Mars and Rahu as baleful demons—if they come, one not only lives in poverty but may also die young.
The sixth degree of the Bi mansion is in the You Palace. Day births are treated as Metal ⚙️; night births as Moon 🌙, the same as the Shen Palace. Mercury and Moon's Veil are examined together; Saturn and Ketu meeting are alike inauspicious.
The half-degree of the Zi mansion lies in the Shen Palace, where Water and Fire rule the palace. Only Water 🌊 serves as the main ruler; the dreaded luminaries are solely Saturn and Ketu coming to intrude.
The Shen mansion is Water 🌊 in the interplay of Yin and Yang (Shen Palace); if Venus ⚙️ joins it, fortune and emolument flourish. Metal and Water as primary traversal are most auspicious; when the limit meets Saturn and Ketu, calamity is certain.
All nine degrees of the Jing mansion belong to Wood 🌱; in the Wei Palace, Wood and Moon are hardest to distinguish clearly. In spring, view as Wood; at night, view as Moon; in day births, Wood and Moon are examined together.
The Gui mansion originally belongs to Great Yin (Moon) 🌙; regardless of day or night, it is judged by moonlight. It is best when Venus and Mercury assist the Moon; it only resents Saturn and Ketu for fear of harming the body. In autumn and winter seasons, connections with Metal should not be discarded.
The Liu mansion's degrees traverse across the Wu and Wei palaces; both palaces are treated as Earth ⛰️. Only the Wu Palace disdains Wood qi 🌱; in the Wei Palace, Wood qi is half-considered inauspicious.
The Star-Sun-Horse mansion resides in the main hall of the Wu Palace; regardless of day or night, it belongs to Great Yang (Sun) ☀️, the essence of yang. Fire and Rahu forming a faction brings harm to the six relatives; Wood qi 🌱 meeting it is a star of difficulty.
The Zhang-Moon-Deer mansion resides in the Wu enclosure. By day it is treated as Great Yang ☀️; by night as Moon 🌙—these two are its sole governors. If it lies across the boundary in the Twin Maidens (Si Palace), it is uniformly reckoned as lunar traversal.
In the Twin Maidens enclosure (Si Palace), the Wings-Fire-Serpent takes Water 🌊 as its main ruler. It does not resent Water and Moon's Veil, but fears Saturn and Ketu; when Venus ⚙️ meets it, this is truly praiseworthy.
The Zhen mansion's degrees traverse across the Si and Chen palaces; both stars are the essence of Water 🌊. It only fears Saturn and Ketu as baleful luminaries; if Venus ⚙️ encounters it, fortune is even more flourishing.
Summary: In determining a person's fate, the masters of the Twenty-Eight Mansions' degrees require that one consider the palace, consider the degrees, and further extrapolate by the monthly orders; none of the three can be neglected.
The core principle of the Twenty-Eight Mansions' palace-degree system can be summarized as three-dimensional cross-positioning:
| Dimension | Content | Function |
|---|---|---|
| Palace Position | The mansions fall into the twelve palaces (Chen, Xu, Chou, Wei, etc.) | Determines the foundational attribute |
| Mansion Degree | The Twenty-Eight Mansions' own Five Element affiliations | Determines the essential attribute |
| Monthly Orders | The rise and decline of Five Elements in the birth season | Determines dynamic change |
Among the three, monthly orders serve as the guiding principle, while palace degrees serve as the particulars. The same mansion can present entirely different Five Element attributes in different seasons—for example, the Di mansion is Earth in the four seasonal months and Fire at other times; the Dou mansion is Wood in spring and Earth at other times. This dynamic Five Element view is the core distinction of the Seven Luminaries and Four Hidden Stars (Qi Zheng Si Yu) astrological system from static BaZi Five Element theories.
This system is essentially a multi-dimensional spatiotemporal analytical model. The Twenty-Eight Mansions can be understood as twenty-eight coordinate regions into which the ancients divided the sky, each region endowed with specific Five Element energy attributes. Its logic of determining by "palace-degree + monthly order" is highly consistent with context-dependent analysis in modern decision science—the same element produces different utilities under different times and environments.
For example, the Fang mansion belongs to Fire, yet when encountering Wood qi it brings "accumulated wealth"—this can be understood as: fiery personalities (strong action orientation, impatience) who receive Wood's nourishment (learning, planning, patience) can transform their action drive into productivity. Conversely, when Fire meets Water (emotionality, environmental pressure), its energy is suppressed.
The poems on the Twenty-Eight Mansions' palaces and degrees reveal a mutually interpenetrating cosmology: there are no absolutely fixed attributes of things; everything manifests within relationships. The Fire mansion is not necessarily pure Fire—it may manifest as Wood in a certain palace position, or as Earth in a certain season. This has deep resonance with the observer effect and context dependence in modern physics: the nature of a thing depends on the frame of reference in which it is situated.
More significantly, the "dreaded luminaries" in the system are not absolutely baleful—the Niu mansion delights in Mars and Rahu overcoming it (Earth is generated by Fire). This logic of "overcoming as generation" reveals that adversity can serve as a catalyst for growth, with the key lying in the subject's own attributes and mode of response.
| Concept | Explanation |
|---|---|
| Seven Luminaries | The seven primary stars: Sun☀️, Moon🌙, Venus⚙️, Jupiter🌱, Mercury🌊, Mars🔥, Saturn⛰️ |
| Four Hidden Stars | Four invisible luminaries: Rahu, Ketu, Moon's Veil (Yuebei), and Purple Qi (Ziqi) |
| Mansion Degrees | The distribution intervals of the Twenty-Eight Mansions within the 360 degrees of the celestial circle |
| Traversal Degree | The specific mansion-degree position where celestial bodies travel |
| Limit Progression | The advancement of major and minor limits, i.e., the fortune trends of different life stages |