The San Sha (三煞, “Three Killings”) is one of the four classical annual sha, governed by a trinity-of-three system. Each of the twelve earthly branches belongs to one of four trinities (water, fire, metal, wood); the year’s San Sha lands in the trinity opposite the year’s branch.
For 2027 (Sheep, Wei 未, member of the Wood trinity 亥卯未 = Pig-Rabbit-Sheep), the San Sha lands in the opposite Metal trinity (申酉戌 = Monkey-Rooster-Dog) — covering the entire West sector. The three branches together cover the western 90-degree arc, so practical home-feng-shui treats the whole West (W1, W2, W3) as San Sha territory through 2027.
The classical rules: no renovation, no digging, no breaking ground, no major construction in the West sector throughout 2027. The San Sha is provoked by physical disturbance (similar to the 5 Yellow), and the “triple loss” classical attribution involves three separate kinds of misfortune layering on top of each other — loss of authority, loss of wealth, and loss of harmony — rather than a single concentrated affliction.
The combination with the 2 Black Earth star (sickness) also landing in the West in 2027 makes the West the third-worst sector of the chart, after the North’s 5 Yellow and the Northeast’s 3 Jade + Year Breaker. Households with West-located bedrooms, kitchens (the stove’s fire combined with the 2 Black Earth + San Sha is an aggressive combination), or main entries should treat the entire West sector with restraint through 2027.
For 24-mountain practitioners working with home facing-direction: any home that faces west in 2027 has its primary qi intake in the San Sha direction. The classical mitigation is to delay any planned major works on the home’s exterior facade through 2027, and to pair the home with a feng shui audit that reads the specific facing direction against the period chart and the year chart together.
For Monkey-, Rooster-, and Dog-born occupants (the three branches in the San Sha direction), 2027 carries elevated annual pressure even though their birth branches are not directly clashing with the year branch. Classical practice recommends careful date selection for major decisions and avoiding renovation of personal-use rooms in the West throughout the year.