◆ Chinese metaphysics · Tang Dynasty
Feng Shui
You are arranging your bedroom or office in an existing home
◆ Side by side
Feng Shui vs Xuan Kong Da Gua
Feng Shui and Xuan Kong Da Gua (玄空大卦, often abbreviated XKDG) are both spatial-energetic disciplines from Chinese metaphysics, but they are pointed at different subjects. Classical Feng Shui — specifically the Ba Zhai (八宅, 'Eight Mansions') school — divides space into 8 directional sectors and matches a person's Kua number to their four favorable and four unfavorable directions. XKDG, a Yuan Kong (玄空) school refinement that became influential in late-Qing-dynasty practice, names an orientation as a pair of I Ching hexagrams and reads the elemental relationship between them, with no occupant in the calculation. Ba Zhai answers 'where should I face?' XKDG answers 'what is this building doing with its own axis?' Different question, different problem class.
◆ Feng Shui branch
Xuan Kong Da Gua
You are buying or building a property and can choose its sitting/facing direction
Key Differences
◆ 5 points- Ba Zhai is person-centric: two people in the same house may have different favorable directions because their Kua numbers differ. XKDG is property-centric: the hexagram pair belongs to the building, not the occupant — anyone living there inherits the same diagnosis.
- Ba Zhai gives the same answer in 1990 and in 2030. XKDG actively re-evaluates because the Period rotates: a hexagram auspicious in Period 8 (2004-2023) may turn unfavorable in Period 9 (2024-2043). This is the classical "time and space inseparable" principle (玄空 literally "mystery and emptiness", but interpreted as "time and space").
- Ba Zhai reads a direction against a person; XKDG reads a direction against itself. Both work from the same eight 45° sectors here — our XKDG reading reduces the bearing to its mountain trigram, so eight sitting hexagrams are reachable, each paired with its inverse. Classical XKDG subdivides the compass much further and weighs the pair against the 20-year Period; that finer ring is not what this app computes.
- Ba Zhai is teachable in an afternoon; XKDG requires fluent classical-Chinese hexagram vocabulary plus knowledge of the three Yuan (上元/中元/下元) and the period replacement rules. The educational gap is part of why XKDG remains a senior-practitioner discipline.
- Ba Zhai has well-defined remediation (move the bed, reorient the desk, place a metal object in the wood-affliction direction). XKDG remediation is structural — you usually cannot fix a wrongly-facing house except by buying a different property or doing major construction. The systems differ on how reversible their diagnoses are.
When to Use Each System
◆ Side-by-sideChoose Feng Shui when
- You are arranging your bedroom or office in an existing home
- You want a per-person directional reading (best/worst direction to face)
- You need a tractable analysis without classical-Chinese specialist knowledge
- You are matching multiple family members to different rooms in a house
Choose Xuan Kong Da Gua when
- You are buying or building a property and can choose its sitting/facing direction
- You are dating a yin zhai (burial site) for ancestral feng shui
- You are selecting an opening/move-in date and want hexagram-Period harmonisation
- You already have a Ba Zhai analysis and want a second reading of the building itself
Side-by-Side Comparison
◆ 7 dimensions| Aspect | Feng Shui | Xuan Kong Da Gua |
|---|---|---|
| School lineage | Ba Zhai (Eight Mansions), formalized by Yang Yun-song (~9th c. CE Tang Dynasty) | Xuan Kong Da Gua, attributed to Jiang Da-hong and refined by Shen Zhu-reng (Qing Dynasty 17th-19th c.) |
| Spatial granularity | 8 sectors (45° each) based on the Eight Trigrams (Bagua) | 64 mountain hexagrams × 64 facing-water hexagrams = 4,096 mountain-water pairings |
| Personalization input | Personal Kua number derived from birth year + gender (one number per person) | Property sitting/facing direction + Period of construction (no per-person calculation) |
| Time treatment | Largely static — your favorable directions do not shift across decades | 20-year Period cycles (currently Period 9, 2024-2043) actively rotate hexagram auspiciousness |
| Output | 4 favorable directions (Sheng Qi, Tian Yi, Yan Nian, Fu Wei) + 4 unfavorable (Jue Ming, Wu Gui, Liu Sha, Huo Hai) | Hexagram pair classification (上元/中元/下元 zodiac alignment, replacement, period-in-period combos) |
| Typical use case | Matching a person to a home, choosing the bed/desk direction, sleeping head-direction | Selecting a property by sitting/facing direction, dating burial sites (yin zhai), construction date selection |
| Overlap with Flying Stars | Independent — Ba Zhai works with personal Kua, Flying Stars with annual/period stars | Often used alongside Flying Stars by senior practitioners; XKDG reads the orientation as a hexagram pair where Flying Stars reads a 9-palace grid |
How KAXANTA Combines Both
KAXANTA computes both a Ba Zhai personal-Kua reading and the XKDG hexagram-pair diagnosis for a given property. ADR-0001 Axis 4 (ENVIRONMENT) makes Feng Shui the primary authority on spatial questions, with XKDG adding a reading of the structure itself when the question is about the building rather than the occupant. The synthesis rule: Ba Zhai answers 'which way should I face?' for everyday placement, and XKDG answers 'what is this property doing with its own axis?' for large structural decisions. The two never genuinely conflict because they answer different sub-questions inside the same axis.
Frequently Asked Questions
Can I just use Ba Zhai and ignore XKDG?
For most everyday spatial decisions in an existing home, yes. Ba Zhai gives you 90% of the value for 10% of the complexity — bed direction, desk orientation, and room assignment can all be solved with a personal Kua. XKDG matters most when you are choosing between properties, scheduling major construction, or doing high-stakes commercial real estate decisions where the property-Period interaction is large enough to matter.
Do Ba Zhai and XKDG ever give conflicting recommendations?
Rarely, because they answer different questions. Ba Zhai tells you which direction within a room to face; XKDG tells you whether the property as a whole is well-configured. If your personal Sheng Qi direction inside a Ba Zhai-favorable room happens to sit inside a building whose XKDG axis reads as a controlling relation, the senior-practitioner reading is to honor the property-level diagnosis (XKDG) for placement of immovable structures and the personal-level diagnosis (Ba Zhai) for moveable furniture. KAXANTA's synthesis applies this same rule.
Why Choose? Get Both.
KAXANTA calculates Feng Shui, Xuan Kong Da Gua, and seven other wisdom traditions — then synthesizes them into one unified cosmic blueprint.
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