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What Is Saju? Korean Four Pillars, Explained Simply

Saju (사주, literally "four pillars") is the Korean name for a Four Pillars birth chart: your birth year, month, day, and hour, each converted into a pair of Eastern calendar symbols, producing four columns — the "pillars" — that describe the pattern of energy you were born into. It is the same system known in Chinese as BaZi, and in older English books as the Four Pillars of Destiny. A saju reading interprets those four pillars to describe how a person tends to think, work, relate, and move through time.

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What does a saju reading tell you?

A saju reading is less a fortune and more a structural profile. From the four pillars, a reader derives:

• Your Day Master — the single symbol standing for "you," the reference point the rest of the chart is read against.
• The balance of the five elements (wood, fire, earth, metal, water) across the chart — what you have in abundance and what you lack.
• The Ten Gods — ten functional roles (authority, output, resource, wealth, peer, and their variants) that describe how your energy expresses: how you create, compete, earn, lead, and rest.
• Luck periods — how the pattern shifts across the decades and years of a life.

Read together, these describe tendencies and timing, not fixed events.

How is a saju chart calculated?

The chart is built from the Eastern lunisolar calendar, not the ordinary Gregorian date. Each of the four time units — year, month, day, hour — is mapped to one of ten Heavenly Stems and one of twelve Earthly Branches. The hour pillar is why an exact birth time matters: it changes the fourth column entirely. Modern tools compute this instantly from a birth date, time, and place; classically it was done by hand from calendar tables.

Is saju the same as Chinese BaZi?

Yes — the underlying system is the same. "Saju" is simply the Korean-language name and cultural framing; "BaZi" is the Chinese name for the identical four-pillar method. The differences you'll see between a Korean saju reading and a Chinese BaZi reading are stylistic and interpretive, not structural. We cover this in detail in Saju vs BaZi.

Saju vs Western astrology

Western astrology is built on planetary positions in the sky at birth. Saju is built on a calendar of time cycles — it doesn't track planets at all. Western astrology leads with sun signs and houses; saju leads with the Day Master, the five elements, and the Ten Gods. They answer overlapping questions ("what am I like?") through entirely different machinery.

From saju to behavioral archetypes

The most useful part of saju for a modern reader is the Ten Gods layer — because it maps cleanly onto observable behavior: how you handle pressure, create, earn, and connect. DaoTiming translates that layer into ten plain-English behavioral archetypes, so you can see your pattern without learning the classical vocabulary first. See The Ten Gods as Behavioral Archetypes.

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Wu, D. (July 24, 2026). What Is Saju? Korean Four Pillars, Explained Simply. DaoTiming. https://daotiming.com/articles/what-is-saju