Classical Eight Mansions doctrine reads the N octant as one of Kua 3’s four favourable directions, specifically carrying the Tian Yi (天醫) assignment — health, recovery, doctors and medicine.
Configuration
- Mountain: 癸 (Guǐ) — N octant, position 3 of 3, 7.5° – 22.5°
- Mountain type: stem · yin water element, yin polarity
- Personal kua: Kua 3 (震 Zhen) — East Life Group, natural direction E
- Eight Mansions assignment: Tian Yi (天醫) — favourable
- Eight Mansions domain: Health, recovery, doctors and medicine
Guǐ (癸) mountain context
Guǐ (癸) is the third of three mountains in the N octant (degrees 7.5° to 22.5° on the compass). It is a heavenly-stem mountain, classified as yin water (yin). Domain: Yin water of late winter, hidden moisture, contemplative interior.
Classical 三合 (San He / Three Combining) doctrine pairs 癸 with 申 + 辰 as the trine grouping. Properties whose facing falls on 癸 can be read alongside the trinity branches for additional refinement during a full audit.
Kua 3 (Zhen) context
Kua 3 (震 Zhen) people belong to the East Life Group (東四命), with natural direction E (the wood-element trigram register). Kua 3 (Zhen) people are East Life Group — born under the Zhen trigram (wood, east). Thrive in E / N / S / SE facing properties; should avoid SW / NW / NE / W.
Guǐ mountain read for Kua 3 Zhen
Classical Eight Mansions doctrine reads the N octant as one of Kua 3’s four favourable directions, specifically carrying the Tian Yi (天醫) assignment — health, recovery, doctors and medicine.
What this means in practice: a property whose facing direction falls on 癸 mountain (within the N octant), occupied by a Kua 3 Zhen person, is read under classical Eight Mansions doctrine as carrying the Tian Yi register — health, recovery, doctors and medicine. The favourable register is one of four favourable octants this kua has; the other three carry Sheng Qi (career), Tian Yi (health), Yan Nian (relationships), and Fu Wei (stability) assignments depending on the kua. The specific assignment for N for Kua 3 is Tian Yi.
Refinement within the octant: Guǐ sits at position 3 of 3 within the N octant. The N octant has three mountains; classical doctrine applies the same Eight Mansions assignment to all three at the octant level, but specific-mountain refinements come from polarity matching (yin mountain vs yang mountain), san he trine groupings, and the mountain’s type (stem vs branch vs trigram). For a Kua 3 person, a yin mountain like Guǐ pairs differently with the kua's wood register than the octant's yang mountains do.
Why this is one input among four
The mountain-kua reading describes Eight Mansions doctrine’s baseline register only. The full audit also requires precise compass-degree facing measurement, the property’s Xuan Kong period chart, and integration across all occupants’ kuas. Master Sean Chan’s feng shui audit integrates all four layers on-site against your specific property.

