Chapter 7: A Survey of the Schools (III): The Xuankong Flying Star School

Xuankong Flying Star has been the most influential principle-and-qi school since the twentieth century, and it represents the fullest realization of the principle-and-qi school's proposition of a "temporal dimension." Its entire appeal lies in a dynamic model: the nine stars fly through the nine palaces along the trajectory of the Luo Writing, shifting between flourishing and decline as the cyclical periods turn over—the very same house carries a different fated chart in different periods. This chapter proceeds in the order of transmission, chart-casting, configuration, substitute trigrams, advanced formulas, a worked example, and a brief assessment.

7.1 The Line of Transmission: Jiang Daihong — Zhang Zhongshan — Shen Zhurong

The genealogy of Xuankong Flying Star's prehistory (Mujiang Shi, Wujizi, and so on) has already been covered in Chapter Two; the reliable thread begins with Jiang Daihong. Jiang annotated the Dili Bianzheng while keeping its formula secret; his disciples, such as Jiang Yao (courtesy name Ru'gao, who annotated the book in verse and is traditionally said to be the author of the Congshi Suibi) and others, each carried on their own version of the tradition; over the following century and more, the branches that claimed Jiang's learning as their own multiplied into the Six Great Xuankong Schools. Of these, the one with the greatest renown for the accuracy of its judgments was the Wuchang school of Zhang Zhongshan of Wuxi (active in the Jiaqing and Daoguang reigns), whose Dili Bianzheng Zhijie openly annotated the scriptures, while the true operative details were kept hidden in the secret manuscript of house cases, the Yinyang Erzhai Luyan. The story of how, at the end of the Qing, Shen Zhurong forcibly transcribed Zhang's secret manuscript and worked backward to reconstruct his method has already been told in Chapter Two—what should be added here is a judgment of substance: Shen's learning was a chart-casting algorithm reverse-engineered from Zhang Zhongshan's house-judgment results, with the system then completed by cross-referencing it against the principles of the Yijing and the doctrine of Purple-White. Whether it is consistent with Jiang Daihong's original intent has never been confirmed at any "orthodox" level, and this is precisely the foothold from which the later Liu Fa and Great Gua schools attack the Flying Star school. In any case, once the Shenshi Xuankong Xue was made public, the Flying Star method swept across the country on the strength of publishing, and became thoroughly popularized in the mid-twentieth century through the writings and teaching of Hong Kong and Taiwan practitioners (further offshoots such as the Zhongzhou school emerged along the way); today, when the Chinese-speaking world speaks of "Xuankong fengshui," it defaults to meaning this very school.

7.2 The Chart-Casting Method: The Period Chart, the Mountain Chart, and the Facing Chart

Casting a Flying Star chart requires only two inputs: the cyclical Period (the Period in force when the house was built or occupied—a "Period Nine house" is one built or occupied between 2024 and 2043) and the sitting-and-facing (measured precisely to the Twenty-Four Mountains, and distinguishing between the standard xia gua facing and an oblique jian xiang facing). Casting the chart proceeds in four steps:

Step one, the New Year's Chart. The base chart matching the Luo Writing to the Later Heaven trigrams: Kan-one, Kun-two, Zhen-three, Xun-four, center-five, Qian-six, Dui-seven, Gen-eight, Li-nine. This serves as the coordinate system for every subsequent flying-distribution.

Step two, the Period Chart. The number of the current Period is entered into the central palace, and flown forward through all nine palaces along the trajectory of the Luo Writing (center → Qian → Dui → Gen → Li → Kan → Kun → Zhen → Xun). For Period Nine, 9 enters the center: Qian-1, Dui-2, Gen-3, Li-4, Kan-5, Kun-6, Zhen-7, Xun-8.

Step three, the Mountain Chart (shifting the star to the sitting mountain). The Period Chart's number in the palace occupied by the sitting mountain is taken and placed into the central palace; whether it then flies forward or backward is determined by the yin-yang of the sitting mountain's Three-Cycles dragon (see 3.5: for instance, zi is a Heaven-Cycle yin dragon, while qian is a Heaven-Cycle yang dragon)—yang flies forward, yin flies backward (flying backward meaning the numbers decrease in sequence). The resulting set of nine palace numbers is the Mountain Chart, conventionally recorded in the upper-left corner of each palace.

Step four, the Facing Chart (shifting the star to the facing). The Period Chart's number in the palace occupied by the facing direction is taken into the center, and, according to the yin-yang of the facing mountain's Three-Cycles dragon, is flown forward or backward to produce the Facing Chart, recorded in the upper-right corner of each palace.

One exceptional rule: when the star entering the center is five (Five Yellow has no trigram and no fixed position of its own), its yin-yang is borrowed from the Three-Cycles-dragon attribute of the sitting mountain (or the facing mountain) itself.

Once the chart is complete, each palace carries three numbers: the Period star, the Mountain star, and the Facing star. The Mountain star governs descendants (health, population, examination success), and the Facing star governs wealth (financial fortune, career), and whether each is flourishing or declining is judged against the current Period: within Period Nine, 9 is flourishing, 1 is nascent (the qi of a future Period), 8 is receding, 7 is in decline, and 2, 3, 5, and the rest are moribund or baleful. The master rule for judgment is: see which palace the flourishing star has fallen into, and whether that palace's actual surrounding environment is mountain or water, and weigh the two together.

7.3 The Four Great Configurations

The first thing one looks at in a Flying Star chart is the distribution of the Mountain and Facing stars across the sitting and facing palaces, which sorts into four basic configurations:

• Flourishing Mountain, Flourishing Facing (reaching the mountain, reaching the facing): the current Period's flourishing star for the Mountain Chart flies to the sitting palace, and the flourishing star for the Facing Chart flies to the facing palace—mountain governs mountain, water governs water, each in its proper place, a configuration flourishing in both descendants and wealth. The precondition is that the external configuration matches: something solid behind the sitting side (a mountain, a tall building) and something open in front of the facing side (water, an open hall).
• Mountain Ascending Water Descending: the reverse—the flourishing Mountain star flies to the facing palace (descending into the water) and the flourishing Facing star flies to the sitting palace (ascending the mountain), indicating loss of descendants and financial ruin. But if the external configuration happens to be "empty behind the sitting side, full in front of the facing side" (water behind the sitting side, a mountain in front of the facing side), the configuration is instead matched—the so-called "reverse-riding dragon"—and an inauspicious configuration turns auspicious. This proviso is extremely important: it is the paradigmatic demonstration of the Xuankong school's principle that "principle-and-qi must always be matched with form."
• Double Stars Meeting the Facing: both the flourishing Mountain star and the flourishing Facing star fly together into the facing palace. This flourishes in wealth, but the descendants-star has descended into the water; the remedy is for there to be "a mountain beyond the water" in front of the facing side (an open hall showing water, with a screening hill or building beyond the water), gaining both wealth and descendants together.
• Double Stars Meeting the Sitting: both flourishing stars come together into the sitting palace. This flourishes descendants but not wealth; behind the sitting side there should ideally be "water beyond the mountain," or water followed again by a mountain behind the sitting side.

A well-known feature of Period Nine (2024–2043) is that, among the standard xia gua charts for all twenty-four mountains and facings, there is no Flourishing-Mountain-Flourishing-Facing configuration at all (a consequence of the symmetry produced when 9 enters the center, the same as in Period One); the usable configurations are mainly the various Double Stars Meeting the Facing types—this makes the choice of facing in Period Nine unusually dependent on the external water configuration matching correctly, and it has become a focal point of discussion in recent Xuankong practice. To cite examples already found in common charts: in Period Nine, the zi-mountain-wu-facing and mao-mountain-you-facing configurations are Double Stars Meeting the Sitting, while wu-mountain-zi-facing and you-mountain-mao-facing are Double Stars Meeting the Facing—for houses along the north-south and east-west cardinal axes, swapping the sitting and facing directions swaps the positions of wealth and descendants, and many of the practical mnemonics for choosing a house in Period Nine are generalized from exactly this kind of pattern.

7.4 Oblique Facings and Substitute Trigrams (Star-Casting)

When the sitting-and-facing falls within a certain number of degrees before or after the exact center of a given mountain, the standard chart-casting method described above is used, and this is called xia gua (casting the standard trigram). If the facing deviates too far from the mountain's centerline (the common threshold is beyond three degrees, though different lineages set it anywhere from three to four and a half degrees), it is instead a jian xiang (oblique facing, e.g., zi facing jian gui, or wu facing jian ding), and one must switch to using substitute trigrams (star-casting): rather than using the original star from the Period Chart, the star entering the center is replaced according to the substitute-trigram formula with a "substitute star." The substitute-trigram formula commonly followed in the Shen lineage is:

Zi, gui, together with jia and shen: Greedy Wolf travels this single road. Ren, mao, yi, wei, and kun: these five positions are Giant Gate. Qian, hai, chen, xun, and si, joined with xu, are named Military Fortune. You, xin, chou, gen, and bing: the heavenly star here speaks of Poison Army. Yin, wu, geng, and ding above: Right Forerunner, the fourth star, presides.

Its use: one looks at which mountain the Period Chart's star in the sitting (or facing) palace corresponds to (restored to a specific mountain according to the New Year's Chart's trigram positions), looks up its substitute star (Greedy Wolf-1, Giant Gate-2, Military Fortune-6, Poison Army-7, Right Forerunner-9), and enters that substitute star into the center, with the forward-or-backward direction still determined by the yin-yang of the original mountain. For quite a few of the twenty-four mountains, the substitute star turns out to be identical to the original star ("no substitute to be found"), in which case the substitute-trigram chart is no different from the standard xia gua chart. The existence of substitute trigrams makes the degree boundary for fixing a facing extremely sensitive—shift by two or three degrees, and the entire chart's stars are recast; this is at once the fine-grained precision the Xuankong school means by "a hair's breadth's error in the parting of the gold," and, in critics' eyes, evidence of the model's fragility (detailed in 7.7).

7.5 Advanced Formulas: The City Gate, Grand Theft, Gathering the Mountain and Expelling the Baleful Influence, and Entering Confinement

The City Gate formula. If either of the two palaces flanking the facing palace contains a water outlet (a genuine water outlet, a road junction, or a qi-gathering gap), it can be borrowed as a "city gate." Its method is to enter the City Gate palace's Period-Chart star into the center and fly it backward; if the current Period's flourishing star happens to arrive at that palace, then this city gate is empowered by the current Period, indicating swift prosperity and an acceleration of wealth. A city gate that shares "the same cycle, one qi" with the facing (belonging to the same Heaven Cycle, or the same Human or Earth Cycle) is a proper city gate, carrying greater force. The City Gate formula is regarded as a remedy that lies outside the chart proper—a chart that is not otherwise flourishing can be rescued for a time by an empowered city gate.

Seven Stars Grand Theft. An advanced configuration transmitted in the Shenshi Xuankong Xue: in certain specific Double Stars Meeting the Facing configurations, if the stars of the Li palace (or the Kan palace) and two related palaces form a continuous "parent-and-child triad" of one-four-seven, two-five-eight, or three-six-nine, one can "steal" the qi of a future Period, enjoying its flourishing qi ahead of time. The school itself distinguishes a "true theft" from a "false theft," and the stated conditions differ from commentator to commentator—this has always been the single most divergently interpreted formula within Xuankong learning, with some scholars even holding that the text itself contains corruptions. This survey can only record it here for the sake of completeness, noting that it remains highly contested.

Gathering the Mountain and Expelling the Baleful Influence. The master rule is the famous line from the Qingnang Xu, traditionally attributed to Zeng Wenchan: "the dragon spirit of the mountain must not descend into the water; the dragon spirit of the water must not ascend the mountain." The Mountain Chart's birth-and-flourishing stars should ideally arrive at solid, elevated ground (gathering the mountain), while the Facing Chart's birth-and-flourishing stars should ideally arrive at a low-lying water surface (gathering the water); conversely, if the Mountain Chart's declining or moribund stars happen to fall on water, and the Facing Chart's declining or moribund stars happen to fall on elevated ground, the declining qi has nowhere to work its mischief, and this is called "expelling the baleful influence." Gathering on one side and expelling on the other, cross-checking the fortune or misfortune of the stars in every one of the nine palaces against the actual landforms of that direction (mountain, water, buildings, roads, doors)—this is the everyday, central work of judging a house by the Flying Star method.

The Commanding Star Entering Confinement. When the current Period's (or a future Period's) flourishing Facing star falls into the central palace, this is called "entering confinement": the central palace has no fixed position and touches no water, so its wealth qi becomes blocked. In practice this is mostly used to estimate the time-limit on a house's fortune: once a given house, having progressed to a certain Period, finds its Facing star entering the center, this is judged to mark the end of that fortune, requiring a change of facing or a renewal via "changing the heavenly heart" (renovating the house's central point) to refresh the house's fortune.

7.6 A Worked Example: The Complete Flying Star Chart for a Wu-Mountain, Zi-Facing House in Period Nine

Suppose a house is completed and occupied in 2025 (Period Nine), sitting wu and facing zi (sitting south, facing north), using the standard xia gua method. Casting the chart: the Period Chart enters 9 into the center and flies forward. For the Mountain Chart, the sitting palace's (Li's) Period-Chart star, 4, is taken into the center; wu is a Heaven-Cycle dragon, 4 corresponds to the Xun trigram, and Xun is yang, so it flies forward. For the Facing Chart, the facing palace's (Kan's) Period-Chart star, 5, is taken into the center; borrowing the facing mountain zi's Heaven-Cycle yin attribute, it flies backward. The resulting chart is as follows (each cell shows: Mountain star · Facing star, with the Period star in parentheses; direction is printed in the traditional format with south at top and north at bottom):

Key points in reading the chart:

1. Configuration: the Mountain star 9 and the Facing star 9 both arrive together at the facing palace, Kan—Double Stars Meeting the Facing, a typical usable configuration for Period Nine. Judgment: prosperous in wealth for the current Period; the descendants-star has descended into the water, so the facing side (the north) needs "a mountain beyond the water"—an open hall showing water (or a road gathering round), with a building further beyond the water serving as a screen, which would gain both wealth and descendants together; if the facing side shows water but is otherwise empty with no screen, the result is prosperous wealth but harmed descendants; if the facing side is blocked with no water at all, the result is prosperous wealth with no source to draw on.
2. The Nascent-Qi direction: the Mountain star 1 (the nascent qi of the coming Period One) is in the Kun palace (southwest); this direction should ideally have a still, solid mountain or building, storing up strength for the descendants of the next Period; the Facing star 1 is in the Li palace (south, behind the sitting side); if there is low, level water or an approach road behind the sitting side, the wealth qi of the coming Period One will have continuity—the common advice that "a Period Nine house should also give some consideration to Period One at its rear" is aimed precisely at this.
3. Inauspicious directions: the Mountain star 5 (Five Yellow) is in the Qian palace (northwest); this direction should avoid tall, active forms and a door or road thrusting directly at it; the Facing star 2 (the Sickness Talisman) is in the Gen palace (northeast); water or activity in this direction would trigger the sickness star, so it should be kept quiet. Combinations of declining stars such as 2·7 in the Zhen palace and 6·3 in the Dui palace are judged by cross-referencing the standard body of interpretive formulas (such as "two and seven sharing a palace" indicating fire, or "three green" indicating disputes) together with the actual external configuration.
4. Overlaying the annual cycle: to judge the fortune or misfortune of a particular year, the annual Purple-White chart is entered into the center and flown, then overlaid on the base chart. For instance, in 2026, a bing-wu year, One White enters the center, and the annual Five Yellow flies to the Li palace—which is exactly the sitting mountain's palace—so in that year, breaking ground or renovating on the sitting-mountain side should be avoided; the combination of the annual star with the base chart's star (such as the annual Five Yellow overlapping the base chart's Mountain star 8) is interpreted in detail according to the standard formulas. The Flying Star school's inference of "timing" (ying qi) comes precisely from overlaying these two layers—the base chart (substance) and the annual cycle (function).

With a single chart in hand, everything within and around the nine palaces, year by year and month by month, can be judged—this all-encompassing inferential capacity is precisely the reason the Flying Star method has become so popular; and its extreme sensitivity to things like "a three-degree error in the facing" or "a one-year difference in the year of occupancy" is likewise laid bare in full by this very chart: the very same building, occupied in 2023 (Period Eight) versus 2025 (Period Nine), yields an entirely different star chart.

Beyond chart-casting itself, judging a house by the Flying Star method also draws on an enormous layer of interpretive formulas: the chart supplies the numerical combination for each palace, and the body of interpretive formulas is responsible for translating those numbers into human affairs. First, consider the basic temperament of each single star (its two faces—flourishing and out of favor—are the first principle of Flying Star interpretation):

Next, consider combinations of two stars. When the Mountain star and Facing star (together with the Period star and annual star) meet within a single palace, their combination carries its own dedicated formulas, whose classic sources are texts such as the Xuankong Miyao, the Feixing Fu, and the Zibai Jue (all collected within the Shenshi Xuankong Xue system). Among the most widely repeated: one and four sharing a palace reliably indicates examination success (Literary Glory meeting the Chief Star, favoring study and examinations); two and five overlapping indicates serious illness and harm to the head of household (the Sickness Talisman meeting the Grand Baleful Influence, one of the most inauspicious combinations in Flying Star interpretation); two and three sharing a degree stirs up the "Ox-Fighting Baleful Influence," indicating disputes and litigation; six and seven sharing a palace is the "Crossed Swords Baleful Influence," indicating conflict and plunder; seven and nine in accord often invites the worry of "the Huilu calamity" (fire); and six and nine sharing a palace is "fire illuminating Heaven's Gate," indicating misfortune for one's elders. The original wording of these interpretive formulas is richly figurative (phrases such as "when fire overcomes metal, and it is further transformed by the number of wood, beware the calamity of fire"), and in actual application they must further be inverted according to whether the star is flourishing or out of favor—the very same combination is read as an auspicious sign when the star is in power, and as an inauspicious one when it is out of favor; layered further still are whether the annual star triggers it, and whether the actual landforms of that palace carry any baleful configuration. A skilled Flying Star master, facing a house chart, is in practice reading it simultaneously across five dimensions at once—the temperament of single stars, the combination of paired stars, the state of flourishing or decline, the triggering of the annual cycle, and the correspondence with actual landforms. The precision and flexibility of this interpretive apparatus (critics would say: precisely because of its flexibility) can now be seen in its full complexity.

7.7 Brief Assessment and Principal Criticisms

The theoretical strengths of Xuankong Flying Star are evident: among all the principle-and-qi schools, it is the one with the most fully developed temporal model—the cyclical Period, the house's own fortune, the annual cycle, and the monthly cycle are nested layer within layer, yielding an inference of "timing" that no other school can offer; its rule for flying through the Luo Writing is uniform and tidy, without the appearance of a patchwork of multiple Five-Phase systems as in the Sanhe school; and its stance that "principle-and-qi must always be matched with form" (by which Mountain Ascending Water Descending can be turned auspicious by the external configuration) also brings it closer to the actual terrain than the Eight Mansions school. Its genre of documented case records (from Zhang Zhongshan's Zhaiduan to the Republican-era Zhaiyun Xin'an) has accumulated the richest body of case literature within the principle-and-qi tradition.

The criticisms are equally sharp. First, its orthodoxy is in doubt. The Shen lineage's Flying Star method is a reverse-engineering of Zhang Zhongshan's house judgments; whether this is truly Jiang Daihong's original intent for "star-shifting" is denied by both the Liu Fa and Great Gua schools, each holding to its own scripture and denouncing the other as false—the Flying Star school has never been able to prove its own direct descent in the ongoing genealogical war among the schools. Second, the model is extremely unstable with respect to input error. The boundary between the standard xia gua and the substitute trigrams is set at three degrees, yet the real-world margin of error in measuring the sitting-and-facing (disputes over magnetic declination, interference from buildings, disagreement over whether to measure by building or by unit) far exceeds this; the abrupt change in a house's chart at the turn of a Period (occupancy in 2023 versus 2024 yielding two entirely different charts) likewise lacks any gradual, physically intuitive transition. A model this sensitive to its inputs, with inputs that cannot themselves be precisely defined, naturally invites doubt about the reliability of its outputs. Third, the flexibility of its body of interpretive formulas. With the nine stars combined in pairs, and further cross-referenced with the annual cycle, almost any real-world event can find a corresponding explanation somewhere in the chart; an explanatory power that encompasses everything is precisely what makes predictive power impossible to test (this point is discussed further in Chapter Thirteen). Fourth, disagreement over conventions within the school itself: which year or solar term marks the boundary of a new Period, whether the sitting-and-facing is measured by building or by unit, at how many degrees of an oblique facing the substitute trigrams should be used, and how "entering confinement" should be calculated—each lineage follows its own method, and it is not uncommon for the same chart to receive different judgments. The Flying Star method represents the intellectual high-water mark of the principle-and-qi school, and at the same time the finest specimen of its methodological predicament—these two statements are not in contradiction.