Qi Men Dun Jia, 奇門遁甲, is a Chinese system for reading a moment rather than a person. A chart is cast for a specific two hour period, and it is consulted to answer a question, to pick a time for something, or to decide which direction to move in.
It is the least familiar of the major Chinese metaphysical systems in English and the one most surrounded by invented history. Both halves are worth separating before anything else.
What the Name Means
The three characters describe the mechanics. 奇, qi, the distinguished ones, are three of the ten Heavenly Stems: 乙 the Sun Qi, 丙 the Moon Qi and 丁 the Star Qi. 門, men, the doors or gates, refers in the name to the three auspicious ones. 遁甲, dun jia, means concealing jia, and it describes what happens to the first Heavenly Stem, 甲, which is hidden beneath six others and never appears on the board.
English renderings such as mysterious door escaping technique are marketing rather than translation. The name is a description of a procedure.
What It Is Used For
A Qi Men chart belongs to a moment, usually the moment a question is asked or a moment being weighed for action.
- Divination, answering a specific question put at a specific time.
- Date and time selection, which is its oldest documented use. A fourth century source describes the method being used to pick auspicious days for going into the mountains.
- Direction selection, meaning which way to travel, face, or send somebody.
- Strategy and planning, which is the historical military application.
- In modern practice, Feng Shui layout, locating people and objects, and business planning.
One documented use is worth recording because it cuts against the popular picture. When the Song Astronomical Bureau recruited successful Qi Men examinees, it trained them to interpret prognostications for weather forecasting. The official state use was meteorological, not personal fortune telling.
What the Record Shows
The documented history is institutional and thinner than most introductions suggest.
- The name 遁甲 first appears in Han period records, in biographies of two men said to have used the skill. Nothing is said about the method itself.
- Before 302 a Daoist writer records having read many dunjia books in his teacher’s library. The books existed and their content is unknown.
- In 602 a Japanese chronicle records a Baekje monk transmitting astronomy, dunjia and calendar books to Japan. This is the hardest early date available: by about 600 it was a named, transmissible discipline.
- It was banned under the Sui, and Japan followed with a legal code of its own. It was treated as politically sensitive from early on.
- Sui and Tang bibliographies list more than fifty dunjia titles between them. Every one is lost. We have names and no methods.
- Around 1040 an emperor ordered an astronomer of the Astronomical Bureau to write a dunjia treatise and the dunjia section of an official military compendium. This is the first surviving systematic exposition of the method.
- Under the Song it was one of the three styles examined for entry to the Astronomical Bureau. A surviving examination question asks the candidate to explain what is meant by winter solstice one, seven, four.
- Ming and Qing practice was maintained inside the Imperial Astronomical Bureau, where posts were hereditary and private study of astronomy was forbidden by law.
One continuity claim survives being checked, and it is a good one. The eleventh century official procedure assigns the solar term Qing Ming the triple four, one, seven. Modern practitioner mnemonic verses give the same triple. The Song state method and current practice use the same table.
And What Is Legend
The famous names are traditional attributions with no textual support behind any of them. The Yellow Emperor receiving the method from a celestial teacher to defeat a rival. His minister Feng Hou composing the original charts. Jiang Ziya reducing them, then Zhang Liang reducing them again. Zhuge Liang as a master of the art, an association mostly downstream of a fourteenth century novel.
The reduction story is the most repeated unsourced claim in popular writing on the subject, and it explains a number the arithmetic already explains. Eighteen configurations, nine for each half of the year, multiplied by the sixty double hour slots in a cycle, give 1,080. The year divides into twenty-four solar terms of three five day periods each, which is seventy-two, and seventy-two divided by eighteen is four, so each configuration recurs four times a year. No legend is needed for any of it.
The pattern is worth naming once and carrying into the rest of this subject. What is documented here is institutional: a bureau, an examination, a prohibition, a dated treatise. What is legendary is personal.
The Chart
The frame is the Nine Palaces, 九宮, arranged as the Luo Shu magic square with five in the centre, where every row, column and diagonal sums to fifteen. Each palace outside the centre carries one of the eight trigrams and one of the eight directions.
Onto the frame go two plates. The Earth plate, 地盤, is stationary and carries the fixed positions. The Heaven plate, 天盤, sits above it and moves. Modern teaching often describes four plates, adding a human plate for the doors and a deity plate for the spirits, which is a relabelling of the same content rather than a different system.
The Eight Doors
The doors, 八門, describe the kind of action a palace supports.
- 休門, Rest: quiet gain, recuperation, stillness.
- 生門, Life: growth, wealth, opportunity.
- 傷門, Injury: harm, conflict, pursuit, collection.
- 杜門, Block: obstruction, concealment, technical skill.
- 景門, View: display, documents, news, examinations.
- 死門, Death: endings, burial, the immovable.
- 驚門, Shock: alarm, litigation, sudden disturbance, speech.
- 開門, Open: beginnings, official matters, commerce.
Open, Rest and Life are the three auspicious gates named in the system’s own title. View is usually read as neutral. Sources differ slightly over whether Block belongs with the inauspicious four or with the neutral.
The Nine Stars and the Eight Deities
The Nine Stars, 九星, are named after the Dipper and carry qualities such as danger, illness, speed, culture, medicine, blockage, endurance and brilliance. They are not identified observable objects, and the Heaven plate is a calculating device rather than a map of the sky.
The deities, 八神, describe the unseen conditions around a matter: authority, entanglement, concealment, union, entrapment, news, stability and expansion. Two of the eight are substituted for two others at the turn of the year.
One structural difference between charting conventions shows up here. One of them uses nine deities rather than eight.
The Three Qi and the Six Yi
Six of the ten Heavenly Stems, 戊己庚辛壬癸, are the Six Yi, and each one conceals one of the six jia pairs. 甲 itself never appears on the board, and the concealment is the dun jia of the name.
The three remaining stems, 乙丙丁, are the Three Qi, and they are the favourable elements a practitioner looks for.
Two governors then set the chart in motion, and they do not move together. One carries the stars to their positions. The other governs the doors, which move on a different count. Most short descriptions say the plate rotates as a block. It does not.
Yang Dun and Yin Dun
The chart runs in two directions depending on the half of the year. From winter solstice to summer solstice it is 陽遁, yang dun, and the palace numbering ascends. From summer solstice to winter solstice it is 陰遁, yin dun, and the numbering descends.
What the split tracks is the lengthening and shortening of daylight. It is solar, not lunar, and the substitution of two deities follows the same line.
Chart Types
Charts are cast at several scales: year, month, day, hour and, in modern software, quarter hour. The hour chart is the dominant form and the one most practitioners mean.
A traditional line puts it in order. An auspicious year is worth less than an auspicious month, which is worth less than a day, which is worth less than an hour. These are chart types rather than lineages, although popular writing calls them schools.
Why Two Practitioners Cast Different Charts
This is the part with practical consequences, and the root of it is arithmetic.
Seventy-two periods of five days is 360 days. The solar year is about 365.24 days. The day count therefore drifts against the solar terms by roughly five and a quarter days every year, and every convention for fixing the configuration is a different patch on the same problem. The Song text already names four situations for it.
Modern practice carries several incompatible conventions for the same job: inserting a leap period when the drift grows too large, taking the current solar term’s divisions directly and breaking the continuous run, counting from the instant the solar term begins and ignoring the day entirely, or applying no correction. The same moment yields a different configuration under different conventions. Practitioners say so openly. It is not a shade of interpretation, it is a different chart.
Two further disagreements sit on top of it.
Rotating or flying: in 轉盤 the Heaven plate turns as a unit, which is the procedure in the eleventh century official method. In 飛盤 the components fly from palace to palace along the Luo Shu sequence. Practitioners on both sides reject the idea of one being true and the other false, and no academic source treats the distinction at all. This guide does not settle it either.
The centre palace: the square has nine palaces and the trigrams supply only eight, so whatever lands in the centre has to be lodged somewhere else. At least half a dozen conventions for where are in use, the argument is centuries old, and it is settled by preference rather than by proof. It changes readings.
A Note on Recently Invented Systems
Several named Qi Men systems in circulation are decades old rather than centuries old, and are marketed with claims of secret Daoist or imperial transmission. The claim is unfalsifiable by design, and the Imperial Astronomical Bureau genuinely did monopolise this material, which is exactly what makes the claim attractive and impossible to check.
There is nothing wrong with a modern system. A modern system presented as an ancient one is a different matter, and asking a teacher for the documented history of their line is a fair question.
What Qi Men Dun Jia Does Not Establish
- Its own origin. Nothing textually connects the famous names to it.
- Continuous transmission before the eleventh century. The earlier titles are lost.
- Any claim to be astronomy. The nine stars are not identified objects and the deities are not celestial bodies.
- A personal reading. An hour chart belongs to a two hour window, and everybody alive in it shares the chart.
- A single correct chart for a moment, because the conventions above disagree and there is no arbiter.
- Anything about mechanism or accuracy. The serious academic treatments study it as a historical prediction system rather than a validated one.
What a reading of any kind does and does not settle is set out in what readings tell you, and where their limits are.
Before Booking
Ask which chart type they use, which convention they follow for fixing the configuration, and where they lodge the centre palace. Those three questions sound technical and they are the ones separating a trained practitioner from somebody running software.