Complete Translation and Interpretation of Volume 26 of the Secret Compendium of Qimen Dunjia

Overall Paraphrased Interpretation

I. Principles of the Celestial Apex and Mount Song Height Measurement 🌞

The celestial apex is named Songgao (Mount Song, the Central Peak). At the summer solstice, the sun's orbital path descends directly toward this point, and the gnomon's shadow completely disappears (no shadow beneath the sun). Approximately nine degrees north of Songgao lies Yangcheng (present-day Gaocheng Township, Dengfeng, Henan). Measuring from Yangcheng as the center, the distance south to Mount Heng is approximately 2,500 li. The ancients used the shadows cast at the mao and you hours (5-7 AM and 5-7 PM) on the spring and autumn equinoxes, which are mutually perpendicular, to determine the east-west direction; they also used the shadow at noon on the summer solstice, perpendicular to the direction of the North Star measured through the nocturnal sighting tube at midnight, to determine the north-south direction — hence Mount Song and Yangcheng lie on the same north-south meridian.

However, two days before the spring equinox, the sun has already actually entered the equinoctial celestial equator degree; two days after the autumn equinox, the sun only then fully reaches the equatorial degree. This manifests the celestial principle that yang is always in surplus. Some say this is because Yangcheng is situated two degrees south, but this is knowing the numbers without understanding the principle. From the earth to the celestial zenith measures sixty-one degrees, and below measures fifty-nine degrees — this is the same principle. Yet truly few understand it.

The celestial equator girdles the middle of the heavens, unchanging through the ages; while the ecliptic occasionally deviates — this is the difference in the sun's orbital path. On the spring equinox, the sun travels eastward to the Horn (Jiao) mansion; on the autumn equinox, it travels westward to the Loo (Lou) mansion, with the north and south poles each at ninety-one degrees. This is the principle by which the celestial equator divides east, west, north, and south.

• On the spring equinox, the sun departs from the ecliptic between the Kui and Lou mansions, rising at mao and setting at you
• On the autumn equinox, the sun departs from the ecliptic between the Zhen and Jiao mansions, likewise rising at mao and setting at you
• On the winter solstice, the sun is on the ecliptic between the Ji and Dou mansions, rising at chen and setting at shen, deviating south of the equator by twenty-four degrees
• On the summer solstice, the sun is on the ecliptic between the Jing and Gui mansions, rising at yin and setting at xu, deviating north of the ecliptic by twenty-four degrees

This is the distinction between the sun's path along the ecliptic versus the equator, and the degrees of the twenty-eight lunar mansions are all reckoned from the celestial equator.

II. On Precession ⏳

After the wu command (summer solstice), daylight hours gradually diminish, yet at the zenith of midday, this attenuation is difficult to perceive. In the Han dynasty, Luo Xiahong first proposed the theory of precession in the Taichu Calendar, suggesting "a difference of one degree every eight thousand years." Jin dynasty scholars Yu Xi, He Chengtian, and Liu Zhun each formulated their own methods for calculating precession, yet none could determine the precise value, because as yin qi gradually deepens, the solar terms shorten, and the differential values accumulate.

According to the Book of Documents (Yaodian), at the winter solstice the sun was at the seventh degree of the Xu mansion; in the first year of King Zhuangxiang of Qin (249 BCE), it was at the twenty-second degree of the Dou mansion; during the Taichu era, at the twentieth degree of Dou; at the Kaiyuan jiazi year (724 CE), at the tenth degree of Dou; at the Qingli jia shen year (1044 CE), at the fifth degree of Dou; during the Kaixi era, ancient measurements showed the sun already at the fourth degree of the Ji mansion. However, the winter solstice at midnight (zi half) is a moment that cannot be altered. Therefore, the Indian (Tianzhu) method maintains: the zodiac divisions are not tied to the mansions, and the mansions do not belong to the divisions — the divisions are fixed, while the mansions shift and change due to precession.

III. Degrees of the Celestial Sphere and the Four Limits 🔢

The celestial sphere totals 365 and one-quarter degrees (365.25 degrees). In one year, the difference between the sun's motion and the celestial motion is divided into four limits, each limit being 91 days and 31 subdivisions. The first limit is the advancing difference, the second is the retreating difference; the two solstices (winter and summer) combine to form the four aspects, called Surplus Beginning, Surplus End, Contraction Beginning, and Contraction End.

IV. Polar Distances of the Twenty-Eight Mansions ⭐

The distances of the determining stars of each mansion from the North Pole are as follows:

V. Ancient Cosmological Theories 🌌

Huangdi's Covering Heaven Theory: Heaven covers the earth like a conical felt hat.

Xuanye (Void Night) Theory: Heaven has no substance whatsoever (empty and formless).

Huntian (Sphere Heavens) Theory: Uses the metaphor of a round shape enclosing yellow (heaven envelops the earth externally, like an egg enclosing its yolk).

Fangtian (Square Heaven) Theory: Holds that heavenly light far rotates northward (celestial bodies revolve with the north as axis).

Xintian (Rising Heaven) Theory: Heaven resembles the human form, with the north side higher.

Antian (Stable Heaven) Theory: Heaven's form is perpetually constant and stable, and the stars do not attach to heaven.

Among all these theories, only the Huntian (Sphere Heavens) theory is the most precise and accurate.

VI. Santai Stars and the Nine Provinces 🌏

The Santai Stars (the six stars of the Three Terraces) govern the Nine Provinces below:

If anomalies appear in provinces not governed by the corresponding star, divination is performed on that province's affairs.

VII. Units of Measure and Capacity 📏

Units of Length:

10 hu = 1 si → 10 si = 1 hao → 10 hao = 1 li → 10 li = 1 fen → 10 fen = 1 cun → 10 cun = 1 zhang → 10 zhang = 1 yin

(The original text's "one silkworm thread is called hu" refers to the finest unit.)

Units of Capacity (Dry Measure):

60 grains of millet = 1 gui → 4 gui = 1 cuo → 1,200 grains of millet = 1 yue → 2 yue = 1 ge → 10 ge = 1 sheng → 10 sheng = 1 dou → 5 dou = 1 hu → 2 hu = 1 shi (dan)

VIII. The Nine Rivers 🏞

The lower reaches of the ancient Yellow River divided into nine rivers flowing to the sea:

• Tuhai: At Taishi, Qingchi, Cangzhou; present-day Nanpi County
• Majia: Present-day Dezhou
• Fulun: Present-day Ande
• Husu: At Wudi
• Linjin: At Dongguang
• Jianjie: At Linqing
• Goupan: At Leling
• Gejin: At Rao'an
• Plus the main trunk of the Yellow River itself

IX. Ancient Warring States Geography 🗺

Wei: Present-day Anyi, Xiezhou; i.e., the Daming Prefecture area. Zhao: Huozhou, Zhaocheng, Handan, Guangping, Changshan. Zhongshan is present-day Dingzhou. Three Qi: Right is Jimo, Center is Linzi, Left is Pinglu. Wu-Yue: The Three Wu are East Suzhou, Central Zhenjiang, West Huzhou. Another tradition says Wuxing, Wujun, and Kuaiji are the Three Wu. Three Yue: Wuyue (Hangzhou), Minyue (Fujian), Nanyue (Guangzhou). Xu: Present-day Xuzhou. Donghai: Present-day Jiaxing and Haining. Yan, You, Ji: Present-day Hebei region. Nanhai: Guangdong. Song: Present-day Guide. Hezhong: Puzhou, Shanxi. Hejian: Hejian Prefecture. Jin: Pingyang, Qujiang. Zheng: Xingyang, Sishui. Zhou: West is Fufeng, East is Luoyang. Qin: Qiyong, Taolin, Shangjun. Three Ba: Central Baxian, Western Ba commandery at Jinzhou/Hezhou, Eastern Ba commandery at Guizhou/Kuizhou/Yun'an/Han. Three Shu: Chengdu, Guanghan, Qianwei. Liang: Huayang, Heishui. Three Chu: South is Jiangling, West is Pengcheng (Xuzhou), East is Wujun. Han: Shangdang (present-day Luzhou), Tongzhou, Yingzhou. Hongnong: Present-day Lingbao County, Henan. Three Rivers: Min River as the Great River, central river, and Xuling as the Northern River. Hanshui Two Sources: One originates from Xixian, the other from Huiquan, both called Bozhong Mountain. Five Ridges: Dayu Ridge, Shian Ridge (Pingle County), Jianhe Ridge (Hezhou), Guiyang Ridge (present-day Lieling), Jieyang Ridge (present-day Chaozhou). Zhangzhou, Fujian: Western Xi Yue is present-day Yanzhou. Shouyang Mountain: In Hezhong Prefecture; some say in Liaozhou. Shangjun: Present-day Suide Prefecture. Chengji: Present-day Qinzhou. Wei Mo: Present-day Liaodong.

X. General Treatise on Wind Divination 🌬

The Erya states: Wind that arises followed by rain is called mai (haze); overcast sky with rain is called yi (dim); sunset with strong wind is called bao (violent); swirling wind is called piao (whirlwind); the burning-wheel wind descending from above is called tui (falling); the spiraling-rising whirlwind is called biao (rising gale). Among the five tones, gong is the sign of wind and rain; with three yu and five zheng shang, when the jue tone first receives rain, it can achieve completion.

XI. Twelve Earthly Branches Divided into Five Tones and Six Emotions 🎵

Twelve Branches Divided into Five Tones:

Six Emotions (assigning six emotional states to the earthly branches):

XII. Distance Determination by Five-Tone Wind 🎐

Determining the distance of influence by the five-tone classification of wind:

Determining distance by wind strength:

Determining by duration:

Determining by hours of strong wind:

XIII. Six Emotions, Five Methods, and Five-Tone Najia Correlation 🧮

The Six Emotions have five methods of determination:

• Root emotion (Benqing): The earthly branch of the current day itself
• Combined emotion (Heqing): The six-combination pair of the branch (e.g., Zi combines with Chou)
• Punishment emotion (Xingqing): The punishment branch of the day's branch
• Clash emotion (Chongqing): The six-clash pair of the branch (e.g., Zi clashes with Wu)
• Bestowed emotion (Xiqing): For yang days, take the branch three positions after; for yin days, take the branch three positions before

Whenever judging the six emotions and directions, only the branch signs are used for inference. The five tones are assigned to days according to the Najia Five-Phase system. For example: Jiazi is yang-shang governed by Greedy Wolf; Yichou is yin-shang governed by Impartiality, and so forth.

XIV. Examples of De, Xing, Mu, Sha for Year, Month, Day, and Hour ⚖

Heavenly Virtue (Tiande) extraction:

• Yang heavenly stems stand in their own position: e.g., Jia's virtue is in Jia
• Yin heavenly stems take their combining counterpart: e.g., Yi's virtue is in Geng (Yi combines with Geng)
• Branch virtue proceeds forward five positions: e.g., Zi's virtue is in Si
• Month's stem virtue: the triple-harmony month's corresponding stem, e.g., Yin-Wu-Xu months' virtue is in Bing

Sha (Killing positions) for year, month, day, and hour (triple-harmony tomb positions):

Five Tombs (Wumu):

Three Punishments (Sanxing) (punishments are especially urgent — one sits but cannot rise in time):

• Punishment above punishing below forms self-punishment. For example: Zi punishing Mao is lower punishment; Wu is upper punishment; You and Hai are self-punishment
• Yin punishes Si, Si punishes Shen, Shen punishes Yin — this is the three punishments
• Chou punishes Xu, Xu punishes Wei, Wei punishes Chou — this is the three punishments
• Zi punishes Mao, Mao punishes Zi — this is mutual punishment
• Chen, Wu, You, and Hai are self-punishments

［Translator's note: The original text's passage on "Three Punishments" shows textual variations from centuries of hand-copying transmission; it may be understood according to the standard cyclic-branch punishment system.］

XV. Wind-Color Divination 🌈

Wind is the beginning of transformation and teaching, arriving from the four directions. When governance is gentle, wind rustles through branches and lifts leaves; when transformation and teaching flourish, the wind is clear and pure. When political order is clear, the weather is temperate, with coolness and warmth properly balanced.

XVI. Host-Guest Method ⚔

Principle One: The Nayin of the day stem-branch is the guest; the direction from which the wind comes is the host.

For example, on a Jia-Zi day, the Nayin is Shang Metal (guest). If wind comes from the Wei, Shen, Chou, or Yin directions (belonging to Zhi Fire), this is Shang activated, and Zhi Fire overcomes Metal — the host prevails. If wind comes from the Si direction (Si belongs to Jue Wood), Metal overcomes Wood — the guest prevails.

Principle Two: The day's Nayin is the guest; the hour branch added is the host.

For example, on a Bing-Yin day, the Nayin is Fire (guest). If the hour branch added is Mao or You (belonging to Yu Water), this is Zhi activated by Yu, and Yu Water overcomes Zhi Fire — the host prevails. If the hour branch added is Chen or Xu (belonging to Shang Metal), this is Zhi activated by Shang, and Fire overcomes Metal — the guest prevails.

Principle Three: Comprehensive judgment.

For example, on a Jia-Zi Metal day, if the hour branch is Chou or Yin (Chou and Yin belong to Zhi Fire), this is Zhi activating Shang, and Fire overcomes Metal — the host prevails. If the wind also comes from the Chou or Wei direction, then there are two Fires against one Metal, and the host wins decisively. Furthermore, if wind comes from the Si direction (the punishment direction), then the guest prevails; if it comes from the punishment direction of the hour, then the host prevails.

General Rules for Determining Host and Guest:

• The distant one is the guest; the near one is the host
• The one in motion is the guest; the one at rest is the host
• The one who initiates is the guest; the one who responds is the host
• The one who moves is the guest; the one who remains still is the host
• When two people fight, the one who strikes first is the guest; the one who responds afterward is the host
• One with Qi (vital energy) prevails; one without Qi is defeated

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🧠 Deep Understanding

Core Concepts 💡

This volume presents the two foundational modules of "Heaven" and "Earth" within the "Heaven-Earth-Human" three-ability system of Qi Men Dun Jia:

1. Astronomical Empirical Spirit: The shadow-measurement at Mount Song, the positioning at Yangcheng, and the calculation of precession all demonstrate a highly empirical approach in ancient astronomical observation. Through gnomon shadow measurement and sighting-tube star observation, the ancients established a precise spatial coordinate system.

2. The Separation of Ecliptic and Celestial Equator: Distinguishing between the ecliptic and the celestial equator is the core of understanding seasonal changes. At winter solstice, the ecliptic deviates twenty-four degrees south; at summer solstice, twenty-four degrees north. This data is extremely close to the actual obliquity of the ecliptic of approximately 23.5 degrees in modern astronomy, revealing the remarkable precision of observation at that time.

3. Awareness of Precession: From the era of the Yao Canon to the Kaixi reign period, the winter solstice sun's position in the lunar mansions shifted from Xu Mansion, degree seven, to Ji Mansion, degree four — a complete record of the precession phenomenon. Although the ancients could not provide the precise precession value (approximately one degree regression every 71.6 years), they had already established the advanced concept that "the palaces are fixed while the mansions are not." This awareness predated European understanding of precession by nearly two thousand years.

4. Comparison of Cosmological Theories: Six theories — the Canopy Heaven, the Infinite Void, the Celestial Sphere, the Square Heaven, the Dawn Heaven, and the Tranquil Heaven — are presented side by side, with the Celestial Sphere theory ultimately favored as superior. This conclusion coincides remarkably with the modern "celestial sphere model," reflecting a rational spirit in theoretical selection.

5. The Logical Structure of the Wind Divination System: Wind divination is not merely simple attribution of good or ill fortune; rather, it establishes a complete inferential framework of "Five Tones — Six Emotions — Direction — Distance — Host-Guest." Its core logic is to treat wind as an information carrier, judging the course of events through the interactions of the Five Elements and host-guest relationships.

6. Host-Guest Dialectics: The general principles of "distant is guest, near is host; moving is guest, stationary is host; active is guest, still is host" constitute one of the most important judgment logics in Qi Men Dun Jia, holding universal value in military, negotiation, and competitive scenarios.

Modern Interpretation 🌟

Modern Verification of Astronomical Data

The ecliptic deviation of twenty-four degrees recorded in this volume (the actual value being 23.44 degrees), the 365.25 degrees of the celestial circumference, and the polar distance measurements of the twenty-eight mansions all align closely with contemporary astronomical data. This proves that the ancients did not engage in idle speculation but conducted long-term systematic observation. Mount Song (Songshan) and Yangcheng (Gaocheng Town) remain important sites for astronomical archaeology to this day; the Duke of Zhou's gnomon platform is located in Yangcheng.

The Practical Significance of Precession

The assertion that "the palaces are fixed while the mansions are not" essentially distinguishes between the two levels of coordinate system (palaces) and reference celestial bodies (mansions). This is analogous to the relationship between "coordinate systems" and "stellar positions" in modern astronomy. In contemporary Qi Men Dun Jia practice, the debate over whether to use "true mansions" corrected for precession or to follow traditional "palace positions" finds its theoretical origin in this very passage. The original text explicitly states: "The palaces have no attachment to the mansions, and the mansions do not belong to the palaces, for the palaces are fixed while the mansions are not" — this is direct grounds for palace priority.

Modern Transformation of Wind Divination

The core of ancient wind divination lies in information interpretation: the wind's direction, intensity, duration, and accompanying phenomena are all regarded as precursor signals of environmental change. From a modern perspective:

• Direction: Represents the source of influence. The Wei, Shen, Chou, and Yin directions are Fire directions; wind coming from a Fire direction represents, under Five Element logic, power arriving from a "Fire-attribute" direction — which can be understood as passionate, aggressive, or destructive information sources
• Intensity and Distance: The stronger the wind and the longer it persists, the wider its range of influence. This is a simple model of communication: information (wind) propagates with spatial attenuation
• Host-Guest Determination: This is essentially a distinction between initiative and passivity. The proactive party is the guest; the passive party is the host. In competitive scenarios, the one who acts first expends more energy, while the responder holds positional advantage — but only on the premise of "having Qi," meaning sufficient energy reserves.

The Systematic Value of Virtue, Punishment, Tomb, and Destruction

The coordination of virtue, punishment, tomb, and destruction constitutes an assessment system of timing and risk in ancient decision-making. Virtue represents assistance, punishment represents friction, tomb represents obstruction, and destruction represents danger. From a modern perspective, this resembles the opportunity and threat dimensions in SWOT analysis, expressed through the Gan-Zhi symbolic system.

Practical Value ⚡

Modern Applications of the Wind Divination System

• Information Forecasting: Transform wind-phenomenon prognostication into a "signal recognition" model. For example, sudden and violent upheaval ("violent onset, abrupt rising") indicates environmental instability, suggesting one should postpone major decisions
• Host-Guest Positioning: In any competitive, negotiating, or game-theoretic scenario, first clarify whether one occupies the "host" or "guest" position:
  • If host (defender, passive party, respondent), the advantage lies in waiting at ease for the fatigued opponent, but requires "having Qi" (sufficient resource reserves)
  • If guest (attacker, proactive party, initiator), the advantage lies in seizing the initiative, but expenditure is great and swift victory is required
• Wind Force and Distance Model: This can be used to assess the depth and breadth of information propagation. In modern society, "wind" can be analogized to public opinion, market changes, event impacts, and so forth, with its range of influence proportional to intensity and duration

Utilizing Heavenly Virtue and Heavenly Destruction

• When selecting an auspicious time to initiate important events, reference the direction of Heavenly Virtue and the day branch, avoiding Punishment, Tomb, and Destruction directions
• In modern project management, one may interpret Virtue directions as "favorable wind periods" and Destruction directions as "risk periods"

Transformation of Ecliptic-Equator Thinking

• The ecliptic represents the "actual operational trajectory," while the celestial equator represents the "normative reference frame." In practical decision-making, one should simultaneously attend to the "actual path" (ecliptic) and the "standard framework" (equator); the deviation between the two is the space requiring adjustment
• The lesson of precession: any system requires periodic recalibration and cannot cling to outdated reference points

Philosophical Reflection 🤔

The Warning of "Knowing the Numbers Without Knowing the Principle"

The original text criticizes those who "may know Yangcheng to be two degrees south, knowing its numbers without knowing its principles," revealing the relationship between data and theory: possessing precise observational data (numbers) does not equate to understanding the underlying principles (reason). This echoes contemporary discussions of "big data is not knowledge." True wisdom lies in mastering both numbers and principles — exact measurement combined with deep understanding of causal mechanisms.

The Philosophical Implications of "Palaces Fixed, Mansions Unfixed"

This is a classic expression of absolute coordinates versus relative reference points. Palaces represent the stable framework; mansions represent shifting calibration points. Within any system, the distinction between "changing" and "unchanging" must be clearly drawn: the framework remains constant while details flow and transform. This idea can be extended to institutional design and cultural inheritance — the core architecture remains stable while specific content advances with the times.

The Deep Logic of Host-Guest Dialectics

"One with Qi prevails; one without Qi is defeated" is the final verdict of the Host-Guest Method. Regardless of position, the decisive factor in victory or defeat is "Qi" — one's inner vitality and life force. This resonates deeply with Sun Tzu's Art of War: "First make oneself invincible, then await the enemy's moment of vulnerability." Positional advantage (host or guest) is merely a condition; ultimately, one's own state determines destiny.

The Projection of the Heaven-Human Relationship

The three terraces stars governing the nine provinces is not mere star worship but constructs a Heaven-Earth-Human corresponding mapping system. The underlying assumption of such mapping is that the cosmos is an organic whole, with structural similarities and linkages existing among all levels. This concept bears striking resemblance to the notion of "holography" in contemporary systems theory.

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📚 Related Knowledge

Related Concepts

Further Reading

• Records of the Grand Historian, Treatise on Celestial Offices (Shi Ji, Tianguan Shu): Sima Qian systematically expounds on the twenty-eight lunar mansions, the movement of the Five Planets, and the theory of field allocation
• Huainanzi, Astronomical Instruction: Detailed discussion of the structure of heaven and earth, and the operating patterns of Yin-Yang and the Five Elements
• Zhoubi Suanjing: The classic text of the Canopy Heaven Theory, containing detailed methods of gnomon shadow measurement
• Kaiyuan Divination Classic (Kaiyuan Zhanjing): Compiled by Gautama Siddha during the Tang Dynasty, collecting extensive ancient astronomical and divinatory literature
• Yisi Divination (Yisi Zhan): Authored by Li Chunfeng, systematically discussing the theory and methodology of wind divination
• Numinous Terrace Secret Garden (Lingtai Miyuan): Authored by Yu Jicai, covering astronomical astrology and wind-angle arts
• Other volumes of The Complete Compendium of Qi Men Dun Jia Secret Texts: The Heaven-Earth Plate, Nine Stars, Eight Gates, Three Marvels and Six Instruments, and other core contents
• Book of Harmonizing and Distinguishing Methods (Xieji Bianfang Shu): Officially compiled during the Qing Dynasty, elaborating on the system of heavenly spirits including Virtue, Punishment, Tomb, and Destruction

Modern Research

• Chinese Astronomical Archaeology: Feng Shi's Chinese Astronomical Archaeology (China Social Sciences Press) provides systematic research on shadow measurement at Mount Song, the Yangcheng site, and the origins of the twenty-eight lunar mansions
• Precession Research: Chen Jiujin and Yang Yi's Astronomy and Calendars in Ancient China details the history of precession's discovery and its application in calendar systems
• Wind Divination Research: Jiang Xiaoyuan's True Origins of Heaven's Science offers a rational analysis of the social functions of ancient astrology and wind-angle arts
• Qi Men Dun Jia Mathematical Research: Contemporary scholars such as Liu Guangbin and Zhang Zhichun attempt to reinterpret Qi Men Dun Jia's decision-making models through the lens of mathematical logic and information theory
• Historical Observation of the Obliquity of the Ecliptic: Pan Nai's History of Astronomical Instruments in Ancient China addresses the precision verification of measuring tools such as gnomons and sighting tubes
• Origins of the Twenty-Eight Mansions: Scholars such as Zhu Kezhen, Qian Baocong, and Xia Nai have conducted in-depth research on the originating era and systematic evolution of the twenty-eight lunar mansions; polar distance data serve as crucial evidence for determining mansion positions