Tian Yu Jing

This opening verse of the Tian Yu Jing is among the most debated passages in all of Chinese Feng Shui literature. The terms Jiang Dong (江東) and Jiang Xi (江西) do not literally refer to geographic regions east and west of the Yangtze River, but rather to two complementary trigram groups that govern the directional Qi of the compass. The third group, the North-South Trigram (南北卦), serves as the parent or mediating set that unifies the other two.

Jiang Da Hong (蔣大鴻), the most influential Qing Dynasty commentator on the Tian Yu Jing, interpreted these three trigram groups as the foundation of the entire San Yuan Flying Star system. The Jiang Dong group flies forward (順飛); the Jiang Xi group flies in reverse (逆飛); and the North-South group provides the generative parent trigrams from which the other two derive. This three-fold division of the 24 mountains into forward-flying, reverse-flying, and parent groups is the structural skeleton of Xuan Kong Feng Shui.

The phrase "eight spirits, four grouped as one" (八神四個一) has been interpreted in multiple ways. The most widely accepted reading, following Shen Zhu Reng (沈竹礽) and later Zhang Xin Yan (章心言), is that each trigram group controls eight of the 24 mountains, and within each group, the mountains are further subdivided into four pairs that share the same flying star sequence. The word "one" (一) in the first line and "two" (二) in the second line refer to the forward and reverse flight paths.

The concluding line — "truly, it responds without error" — is Yang Yunsong's emphatic declaration that this three-fold classification system is reliable and produces consistently accurate results when properly applied. The practitioner who correctly identifies which trigram group governs a given mountain direction can then determine whether the flying stars move forward or in reverse, which is the single most critical step in constructing a Flying Star chart.

Source: Tian Yu Jing (天玉經), Upper Volume (上篇), attributed to Yang Yunsong (楊筠松).

The concept of Father-Mother Trigrams (父母卦) is central to the entire Xuan Kong system. In the San Yuan framework, the three parent trigrams generate three families of mountain directions. Each 'child' mountain inherits its flying sequence (forward or reverse) from its parent trigram. The practitioner must first identify the parent trigram of any given mountain to determine the correct flying star arrangement — an error at this stage propagates through the entire chart.

Yang Yunsong's warning — "do not lightly reveal this celestial mechanism" — reflects the Tang Dynasty tradition of restricting advanced Feng Shui knowledge to initiated disciples. The Tian Yu Jing was deliberately composed in cryptic verse precisely to prevent casual readers from extracting its methods. This secrecy was not mere elitism; in the Tang and Song periods, Feng Shui was a matter of imperial strategic interest, and the ability to select auspicious sites for capitals, tombs, and military positions was considered a state secret.

The phrase "upside-down and reversed is the true transmission" (顛顛倒倒是真傳) encodes the most important practical insight of Xuan Kong Feng Shui: the temporal reversal of auspicious and inauspicious qualities. A mountain-water configuration that brings prosperity in one twenty-year period can bring disaster in another, because the flying stars that govern the site's Qi have shifted. This is why Xuan Kong practitioners must recalculate assessments whenever a new period begins — most recently at the transition from Period 8 to Period 9 in 2024. The 'reversal' is not metaphorical; it literally means that the star numbers occupying each palace of the Flying Star chart change with each period, producing opposite effects.

Later commentators, particularly Tan Yang Wu (談養吾), connected the Father-Mother Trigrams to the He Tu number pairs discussed in the Qing Nang Jing. The 1-6, 2-7, 3-8, 4-9 pairings of the He Tu are interpreted as the generative mechanism through which the parent trigrams produce their children — linking the Tian Yu Jing's practical methods back to the cosmological foundation established by the earlier classic.

Source: Tian Yu Jing (天玉經), Upper Volume (上篇), attributed to Yang Yunsong (楊筠松).

This passage establishes the practical methodology for site assessment in the Xuan Kong system. The requirement that Dragon, Facing, and Water must all match is not merely a preference but an absolute condition. In Flying Star practice, the incoming dragon (the mountain ridge that supplies Qi to the site) determines the mountain star; the facing direction determines the water star; and the actual water features must align with the auspicious star positions in the chart. A mismatch between any two of these three elements weakens or negates the site's potential.

The Three Auspicious Positions (三吉位) — Wealth (祿), Horse (馬), and Official (官) — correspond to specific star-number combinations in the Flying Star chart that indicate financial prosperity, mobility and opportunity, and career advancement respectively. The practical instruction is that the water mouth (水口) — the point where water exits the visible landscape — should be located in the direction governed by one of these three auspicious stars. This is one of the few passages in the Tian Yu Jing that provides a relatively direct method for site evaluation.

The warning against Dead Qi (死氣) introduces the temporal dimension that distinguishes Xuan Kong from purely form-based methods. Qi can be 'dead' for several reasons: it may belong to a period that has already passed (退氣 — retreating Qi), it may come from a direction whose star is in a declining cycle, or it may arrive through a landscape formation that has been geologically disrupted. Yang Yunsong's instruction is unambiguous: regardless of how good the sitting mountain or water formation appears, if the Qi it carries is dead, the site must be rejected.

The phrase "this is the true Yin-Yang" (本是真陰陽) distinguishes the Xuan Kong definition of Yin-Yang from simplified folk interpretations. In Xuan Kong, Yin and Yang are not merely about mountain versus water or north versus south — they refer to the specific star-number assignments that determine whether a direction carries mountain Qi (Yin, still, accumulating) or water Qi (Yang, moving, dispersing). Getting this assignment correct is the prerequisite for all subsequent Flying Star calculations.

Source: Tian Yu Jing (天玉經), Upper Volume (上篇), attributed to Yang Yunsong (楊筠松).

This verse is the mathematical heart of the Tian Yu Jing and the passage most directly applicable to Flying Star chart construction. The statement that the 24 mountains produce 48 configurations through forward and reverse flight is the structural principle that generates all Flying Star charts. Every Xuan Kong practitioner must master this division: given any of the 24 mountain directions and the current period, they must know whether the stars fly forward or in reverse, and then construct the complete nine-palace chart accordingly.

The Paired Mountain (雙山) system groups the 24 mountains into twelve pairs: Ren-Zi (壬子), Gui-Chou (癸丑), Gen-Yin (艮寅), Jia-Mao (甲卯), Yi-Chen (乙辰), Xun-Si (巽巳), Bing-Wu (丙午), Ding-Wei (丁未), Kun-Shen (坤申), Geng-You (庚酉), Xin-Xu (辛戌), and Qian-Hai (乾亥). Each pair shares the same Yin-Yang assignment — both mountains in the pair fly their stars in the same direction (both forward or both reverse). This pairing reduces the apparent complexity of the 48 configurations and provides a systematic method for memorisation.

The reference to Greedy Wolf (貪狼) — Star 1 — introduces the Nine Star system that underlies all Flying Star calculations. The nine stars (Greedy Wolf, Giant Gate, Stored Existence, Literature Melody, Integrity, Military Melody, Broken Army, Left Assistant, Right Assistant) correspond to the numbers 1 through 9 and carry specific elemental and characteristic associations. Yang Yunsong's statement that 'obtaining Greedy Wolf is the marvellous secret' indicates that Star 1, as the beginning of the cycle and the Water-element star associated with wisdom and new enterprise, is the most fundamentally auspicious star to activate.

The deeper implication is that the entire Flying Star system ultimately derives from this one structural principle: the division of the 24 mountains into forward and reverse groups based on their Yin-Yang polarity. Once this division is mastered, the practitioner can construct any of the 48 base charts, overlay them with the current period's energy, and assess any site in any time period. This is why Yang Yunsong placed this verse at the centre of the Middle Volume — it is the operational key to the entire system.

Source: Tian Yu Jing (天玉經), Middle Volume (中篇), attributed to Yang Yunsong (楊筠松).

This passage provides the rule for determining whether stars fly forward or in reverse — the most critical operational step in constructing a Flying Star chart. The metaphorical language of 'left rotation' and 'right rotation' maps directly onto the numerical flight sequences: forward flight (順飛, ascending numbers) for Yang mountains, and reverse flight (逆飛, descending numbers) for Yin mountains.

The Yin-Yang assignment of the 24 mountains follows a specific pattern that must be memorised by every Xuan Kong practitioner. The three Heavenly Stem mountains in each quadrant alternate between Yin and Yang, and the Earthly Branch and Trigram mountains follow their own assignment rules. The most common system, codified by Jiang Da Hong and his disciples, assigns: Jia (甲), Bing (丙), Geng (庚), Ren (壬) as Yang; Yi (乙), Ding (丁), Xin (辛), Gui (癸) as Yin. The four corner trigrams (Gen 艮, Xun 巽, Kun 坤, Qian 乾) and the four cardinal branches (Zi 子, Wu 午, Mao 卯, You 酉) follow the Paired Mountain system's assignment.

Yang Yunsong's statement that 'the person who recognises Yin and Yang need not worry about finding a great site' is not hyperbole — it is a practical truth. The single most common error in Flying Star practice is incorrectly assigning the Yin-Yang polarity of a mountain direction, which causes the stars to fly in the wrong sequence and produces an entirely incorrect chart. A practitioner who has mastered this assignment can construct accurate charts for any direction in any period, and will therefore be able to identify the auspicious configurations that others miss.

The final couplet emphasises purity of polarity: a site where the mountain, facing, and water all share the same Yin or Yang quality produces clear, strong results — either clearly prosperous or clearly declining. Mixed-polarity sites produce ambiguous, unstable conditions. This purity principle guides the practitioner in both site selection and building orientation.

Source: Tian Yu Jing (天玉經), Middle Volume (中篇), attributed to Yang Yunsong (楊筠松).

This passage is remarkable for containing one of the earliest explicit references to Xuan Kong (玄空) as a named system. While the term appears in earlier Buddhist and Daoist philosophical texts, its use here in a specifically Feng Shui context establishes the Tian Yu Jing as a source text for the Xuan Kong tradition. Yang Yunsong's declaration that he will 'break open a thousand years of confusion' positions the Tian Yu Jing as a clarifying text — one that resolves the ambiguities left by earlier classics like the Qing Nang Jing.

The palm-seeking method (掌上尋) refers to the traditional technique of using the segments of the fingers to track Flying Star positions through the nine palaces. The left hand's middle three fingers provide nine segments corresponding to the nine palaces of the Luo Shu grid. By moving the thumb across these segments in the forward or reverse flight sequence, a practitioner can construct a complete Flying Star chart without paper or calculator. This method was the standard field technique before the advent of digital calculators and remains valued as a check against computational errors.

The sitting-facing pairing principle — divided by generation and conquest (分生剋) — introduces the Five Element analysis that overlays the numerical Flying Star chart. Once the mountain and water stars are placed in each palace, the practitioner must assess the elemental relationship between the two stars in each palace, and between each star and the palace's native element. A generating relationship (mountain star generates water star, or both generate the palace element) produces auspicious conditions; a conquering relationship (stars in destructive conflict) produces problems specific to the elements involved — for example, a Fire star conquering a Metal star in a palace indicates respiratory illness or legal troubles for the occupant of that sector.

The phrase 'welcoming the mountain and receiving the water' (迎山接水) describes the ideal site configuration where the building's orientation simultaneously captures beneficial mountain Qi from behind (through the sitting direction) and beneficial water Qi from the front (through the facing direction). This dual reception is what distinguishes a truly excellent Xuan Kong site from a merely adequate one.

Source: Tian Yu Jing (天玉經), Middle Volume (中篇), attributed to Yang Yunsong (楊筠松).

The distinction between Zero God (零神) and True God (正神) is perhaps the single most practically important teaching in the entire Tian Yu Jing, and the one most directly applicable to modern Feng Shui practice. The principle is straightforward: in any given twenty-year period, one direction is the True God (corresponding to the period number) and the opposite direction is the Zero God (corresponding to the period's complement). Mountains should be placed in the True God direction; water should be placed in the Zero God direction.

For the current Period 9 (2024–2043), the True God is the South (Li, number 9) and the Zero God is the North (Kan, number 1). This means that buildings in Period 9 benefit from having solid, mountain-like features to their south (high walls, elevated ground, tall buildings) and water-like features to their north (ponds, rivers, roads, open space, lower ground). A building with water to the south and mountains to the north during Period 9 has its True God and Zero God reversed — a condition called 上山下水 (Shàng Shān Xià Shuǐ), literally 'mountain ascending, water descending,' which is one of the most inauspicious configurations in Flying Star Feng Shui.

The verse's statement that the True God requires a hundred paces while the Zero God does not ask about length reflects a practical observation: mountain Qi (True God) needs substantial physical form to accumulate — a small hill or a thin wall is insufficient. Water Qi (Zero God), however, can be activated by even a small feature — a fountain, a fish tank, or an open door — because water Qi moves and disperses naturally, requiring less physical mass to generate its effect.

The instruction to 'direct water into the Zero Hall' (撥水入零堂) is the most commonly cited practical directive from the Tian Yu Jing. In residential Feng Shui, this means placing the main water feature — whether a fish tank, a fountain, or even the main entrance (which represents the flow of Qi into the house) — in the sector that corresponds to the Zero God direction. In Period 9, this is the northern sector of the building. This single adjustment is often the most impactful change a Xuan Kong practitioner can recommend.

Source: Tian Yu Jing (天玉經), Lower Volume (下篇), attributed to Yang Yunsong (楊筠松).

This is perhaps the most frequently quoted verse in all of Xuan Kong Feng Shui, and it encapsulates the system's most fundamental operational rule: mountain stars must have mountains; water stars must have water. The metaphor of dragon spirits that cannot cross between domains — mountain dragons that cannot survive in water, water dragons that cannot survive on mountains — makes the principle vivid and memorable.

In practical Flying Star analysis, once the chart is constructed for a given building (based on its sitting direction, facing direction, and construction period), the practitioner examines each of the nine palaces to determine whether the mountain star and water star in that palace are supported by the appropriate physical features. If a palace has an auspicious mountain star (e.g., the current period's timely star) and that palace's physical location has actual high ground, walls, or elevated features behind it, then the mountain star is properly supported — the mountain dragon is 'on the mountain.' If instead that palace faces open water or a road, the mountain star is unsupported — the mountain dragon has 'descended to water' — and the health and family benefits are lost.

The maxim 'mountains govern people, water governs wealth' (山管人丁水管財) is the single most practically applied principle in Chinese Feng Shui. It provides the diagnostic framework for every consultation: if a family reports health problems or difficulty conceiving, the practitioner examines the mountain star positions; if they report financial difficulties, the practitioner examines the water star positions. This division of influence between mountain stars and water stars gives the Flying Star system its characteristic dual-axis analysis — every site is evaluated for both its 'people luck' (mountain stars) and its 'wealth luck' (water stars) simultaneously.

The phrase 'a hundred li seen in a single glance' suggests that once this principle is mastered, the practitioner can assess any landscape rapidly by identifying where the mountains and water are in relation to the site. The scale can range from macro (natural mountain ranges and rivers) to micro (interior walls and doorways within a single room). The principle operates at every scale because the Flying Star chart applies to the building as a whole, to individual floors, and even to individual rooms.

Source: Tian Yu Jing (天玉經), Lower Volume (下篇), attributed to Yang Yunsong (楊筠松).

This passage addresses the technical procedure of star arrangement (排星) and introduces one of the most advanced — and most controversial — techniques in the Xuan Kong repertoire: the Seven Stars Robbery (七星打劫). The basic instruction to 'arrange the stars carefully and examine the Five Elements' is a reminder that constructing the Flying Star chart is not merely a mechanical procedure but requires understanding the elemental relationships between the stars and the palaces they occupy.

The Seven Stars Robbery technique has been interpreted in radically different ways by different Xuan Kong lineages. The most widely accepted interpretation, following Shen Zhu Reng's (沈竹礽) Shen Shi Xuan Kong Xue (沈氏玄空學), is that when three specific palaces in the chart contain stars that form a 1-4-7, 2-5-8, or 3-6-9 combination (known as the 'Father-Mother Three-Type' grouping), those palaces can 'seize' the timely Qi of the current period even though their individual stars may be untimely. This allows a practitioner to find prosperity in charts that would otherwise be dismissed as inauspicious — effectively expanding the range of viable site configurations.

The reference to the Li palace (離宮) is particularly significant for the current Period 9. Since Li corresponds to the number 9, and Period 9 runs from 2024 to 2043, the Li palace is the seat of the current period's dominant energy. The text's instruction that the Seven Stars must 'harmonise with Li' suggests that the robbery technique is most powerful when it activates configurations that channel Qi toward or through the Li palace — an interpretation that has practical implications for site selection and interior design during the current period.

The verse's emphasis on identifying the incoming mountain's peak (來山起頂) connects the Flying Star chart back to the physical landscape. The chart is not an abstract calculation applied in isolation — it must be grounded in the actual terrain. The peak of the approaching mountain ridge determines the quality and direction of the incoming dragon Qi, which in turn validates or contradicts the chart's theoretical predictions. A chart that shows auspicious mountain stars is meaningless if the actual mountain behind the site is broken, eroded, or slopes away.

Source: Tian Yu Jing (天玉經), Lower Volume (下篇), attributed to Yang Yunsong (楊筠松).

The Outer Compilation (外篇) shifts from theoretical principles to practical application, and this passage addresses two of the most critical field measurements: the incoming dragon (來龍) and the water mouth (水口). Together, these two measurements frame the entire site assessment — the dragon tells the practitioner where the Qi comes from, and the water mouth tells them where it goes. Every other measurement (sitting, facing, Flying Star chart) must be consistent with this dragon-to-water-mouth axis.

The City Gate Technique (城門訣) is one of the most prized methods in the Xuan Kong practitioner's toolkit. In its standard interpretation, the City Gate is the palace that is 90 degrees clockwise or counter-clockwise from the facing palace. If this palace contains a timely or auspicious star and is activated by actual water or movement in the physical environment, it serves as a supplementary wealth entrance that amplifies the site's prosperity. The technique is particularly valuable for sites whose main facing direction has an inauspicious water star — the City Gate provides an alternative pathway for wealth Qi to enter.

Yang Yunsong's insistence on oral transmission (口傳) for the City Gate technique reflects the historical reality that the most powerful Xuan Kong methods were never fully documented in the classical texts. The Tian Yu Jing, Qing Nang Xu (青囊序), and Du Tian Bao Zhao Jing (都天寶照經) together contain enough information to construct the theoretical framework, but the specific operational details — particularly the rules for identifying and activating the City Gate — were reserved for direct master-disciple transmission. This is why different Xuan Kong lineages (Shen Shi 沈氏, Tan Shi 談氏, Zhang Shi 章氏) sometimes produce different interpretations of the same text.

The concluding couplet — 'identify the incoming dragon and water mouth, then wealth and honour will shine' — summarises the Tian Yu Jing's practical teaching in its most distilled form. All of the text's theoretical discussions about trigram groups, forward and reverse flight, Zero God and True God, and mountain-water separation ultimately reduce to this: find the site where the dragon Qi arrives strongly and the water mouth is positioned auspiciously, confirm these with the Flying Star chart, and prosperity follows.

Source: Tian Yu Jing (天玉經), Outer Compilation (外篇), attributed to Yang Yunsong (楊筠松).

This concluding section of the Outer Compilation provides a systematic summary of the compass methodology that underlies all the preceding theoretical discussions. The distinction between the Earlier Heaven (先天) and Later Heaven (後天) compass arrangements is fundamental to understanding why the Luopan (Chinese geomantic compass) has multiple concentric rings — each ring encodes a different arrangement, and the practitioner must know which arrangement to use for each type of assessment.

The division of the eight trigrams into two groups — Qian, Kun, Gen, Xun as 'Heaven's mechanism' and Kan, Li, Zhen, Dui as 'orthodox tradition' — corresponds to the structural distinction between the four inter-cardinal trigrams (which occupy the 'corner' positions on the compass) and the four cardinal trigrams (which occupy the N, S, E, W positions). In Flying Star practice, these two groups behave differently: the four corner trigrams (Qian, Kun, Gen, Xun) each contain only one mountain direction (the trigram itself), while the four cardinal groups each contain three mountain directions (the Branch, the Stem, and the adjacent trigram). This structural asymmetry is what produces the complex Yin-Yang assignments discussed in the Middle Volume.

The final instruction — 'observe the water placement from the facing direction' — provides the simplest possible practical test for a site's financial potential. Before conducting a full Flying Star analysis, the practitioner can perform a quick assessment by standing at the building's front door, facing outward, and observing where the water features (rivers, ponds, roads, open spaces) are located relative to the facing direction. If the water is in a position that corresponds to an auspicious star in the Flying Star chart, the site has wealth potential. If the water is in a position corresponding to an inauspicious star, financial difficulties are indicated.

This practical simplification reflects Yang Yunsong's pedagogical approach throughout the Tian Yu Jing: the theoretical framework is complex and multi-layered, but the practical application can often be reduced to a few key observations. The master knows the theory deeply; the practice, performed correctly, can be swift and decisive. The Outer Compilation's function is to bridge the gap between the cryptic inner volumes and the reality of on-site assessment, providing the practitioner with actionable methods grounded in the text's deeper principles.

Source: Tian Yu Jing (天玉經), Outer Compilation (外篇), attributed to Yang Yunsong (楊筠松).

The Tian Yu Jing's concluding passage returns to the foundational principle that unifies all classical Feng Shui texts: the integration of Form (巒頭) and Compass methods (理氣). This same principle appears in the Qing Nang Jing ('Form is Substance, Compass is Function'), the Zang Shu ('Qi rides the wind and scatters; it is bounded by water and stops'), and the Du Tian Bao Zhao Jing ('The mountain's form must match the star's number'). Yang Yunsong's restatement here — that knowing only one method is a 'hollow transmission' — serves as both a conclusion and a warning.

The concept of Heaven's Timing (天時) adds the third dimension to the two-dimensional landscape assessment. A mountain may be a 'true dragon' with excellent form, and the acupoint may be correctly identified — but if the building is constructed or the burial is conducted during an unfavourable period, the timing component is missing and the full potential of the site cannot be realised. This is why Xuan Kong practitioners always note the construction date and the current period when assessing a building — the same physical structure can shift from auspicious to inauspicious as the periods change.

The term 'hollow transmission' (虛傳) carries particular weight in the context of Tang Dynasty Feng Shui lineage politics. Yang Yunsong was the most prominent practitioner of the Jiangxi (Form) School, yet his Tian Yu Jing is fundamentally a Compass School text. This apparent contradiction is resolved by this final passage: Yang Yunsong did not belong to either school exclusively. He taught that both are necessary and that practitioners who identify with only one school possess an incomplete art. The Tian Yu Jing's entire structure — from the trigram groups of the Upper Volume through the Flying Star mechanics of the Middle and Lower Volumes to the practical landscape methods of the Outer Compilation — demonstrates this integration.

The closing admonition — 'do not take the Classic of Heavenly Jade lightly' — is both a claim of the text's importance and a recognition of its difficulty. The Tian Yu Jing's deliberately obscure verse style has frustrated and inspired generations of commentators. But Yang Yunsong's purpose was not to confuse — it was to ensure that only practitioners with sufficient dedication and guidance from a qualified master would unlock the text's methods. The Heavenly Jade Classic remains, over a millennium after its composition, the most important theoretical text in the Xuan Kong Flying Star tradition.

Source: Tian Yu Jing (天玉經), Outer Compilation (外篇), attributed to Yang Yunsong (楊筠松).