Saju
The Korean reading of the four pillars: the year, month, day and hour of a birth turned into eight characters.
In one sentence
The Korean reading of the four pillars: the year, month, day and hour of a birth turned into eight characters.
How it is used
A reading starts from those eight characters and the balance of elements between them, then layers on the cycles that move with time. It shares its root with the wider East Asian four pillars tradition, so the tables are largely the same; what is Korean is the vocabulary, the convention around the midnight hour and which parts a reader leans on. It is a language for describing tendencies, not a script that fixes what happens.