Home Check measures orientation by exact degree and reads the mountain, trigram and sitting direction at once; every mountain has its own page in this knowledge base.
Glossary · Compass & qi theory
24 Mountains二十四山
Explanation
Each trigram of the bagua spans 45° and holds exactly three mountains. Kan in the north holds Ren, Zi and Gui; Xun in the southeast holds Chen, Xun and Si. Because each mountain is only 15° wide, two homes that both "face southeast" may sit in three different mountains.
That is why quantitative feng shui always reads orientation as a degree first, then converts it to a mountain, instead of naming one of eight directions.
How Home Check uses it
Questions
Why does the compass use 24 mountains rather than 8 directions?
Each of the eight directions is 45° wide — too coarse to read a house. Splitting the circle into 24 mountains of 15° tells apart homes that differ by only a few dozen degrees.
Why are there no Wu and Ji mountains?
Wu and Ji belong to Earth at the centre and match no point on the circle, so the 24 mountains use only the other eight Heavenly Stems.
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Markdown version of this page Index for machine readers (llms.txt)