What Is Saju? A Plain Guide to the Four Pillars of Destiny
Saju is an East Asian way of describing a person by the moment of their birth. The word is Korean and means "four pillars". In China the same system is called BaZi, which means "eight characters", and in Japan it is known as shichu suimei. This guide explains what the pillars are, where the five elements come in, and what the system can and cannot tell you.
Four pillars, eight characters
A Saju chart is written as four columns, called pillars. They stand for the year, the month, the day and the hour of birth. Each pillar has two characters, one on top and one below, which makes eight characters in all. That is where the Chinese name BaZi comes from.
The top character of each pillar is a Heavenly Stem and the bottom one is an Earthly Branch. Together the two form one of sixty possible pairs. The sixty pairs run in a fixed cycle, like the days of a very long week, and the cycle is used to count years, months, days and even two-hour periods of the day.
Because every birth moment falls into one pair for each of the four positions, a chart is a short, compact summary of when you were born. Two people born on the same day but several hours apart share three pillars and differ in the fourth.
Heavenly Stems and Earthly Branches
There are ten Heavenly Stems. They are the five elements of wood, fire, earth, metal and water, each taken twice, once in a yang form and once in a yin form. In order they are Jia and Yi for wood, Bing and Ding for fire, Wu and Ji for earth, Geng and Xin for metal, and Ren and Gui for water.
There are twelve Earthly Branches. They are the twelve animals of the Chinese zodiac: rat, ox, tiger, rabbit, dragon, snake, horse, goat, monkey, rooster, dog and pig. Each branch is also tied to an element, to a season and to a two-hour period of the day. The rat, for example, rules the hours from 11 pm to 1 am.
The stems describe the visible, outer layer of a pillar, and the branches describe the deeper layer beneath it. Traditional readers pay close attention to both, and to the hidden stems that sit inside each branch.
The five elements and how they relate
The five elements are not substances so much as five kinds of movement. Wood grows and spreads, fire rises and warms, earth holds and steadies, metal cuts and gathers, and water sinks and flows. Saju looks at how much of each element is present in a chart and how they interact.
Two cycles organise the relationships. In the generating cycle, wood feeds fire, fire makes earth as ash, earth bears metal, metal gathers water, and water nourishes wood. In the controlling cycle, wood breaks earth, earth dams water, water puts out fire, fire melts metal, and metal cuts wood.
A chart with plenty of one element and little of another is described as unbalanced, and a reader may suggest that the missing element is worth bringing in through colours, directions, work or names. Whether that advice helps anyone is a matter of belief, but it is the logic that gives Saju its practical flavour.
The Day Master
The stem of the day pillar is called the Day Master. It stands for the self, and every other character in the chart is read in relation to it. A Day Master of Ding fire, for example, is a gentle, steady flame like a candle, and the other seven characters are described as helping that flame, feeding it, draining it or putting it under pressure.
Because there are ten stems, there are ten Day Masters. Our guide to the ten Day Masters describes each of them, and it is a good place to go next if you already know your own.
Why exact timing matters
Saju does not use the ordinary calendar months. The year changes at the Start of Spring, around February 4, not on January 1 or at Lunar New Year. The months change at twelve solar terms, which are points where the Sun reaches particular positions on its yearly path. A person born on February 3 and a person born on February 5 can therefore belong to different years.
The hour pillar depends on the local solar time of the birth place, so the birth time and the city both matter. A birth at 11:30 pm falls in the hour of the rat, and traditions differ on whether it counts as the new day or the old one. Our calculator follows one stated convention and says so on the How it works page.
When the birth time is unknown, a chart can still be drawn from three pillars. It is less complete, and a good reader will say so.
What Saju can and cannot do
Saju is a tradition with a long written history, and many people find its images and vocabulary a thoughtful way to talk about character and timing. It has no scientific support as a predictor of life events, and no honest practitioner can promise outcomes. Treat it as a mirror for reflection, not as a verdict.
Used lightly, it can be a pleasant way to choose between names that you already like. That is how NamesByStars uses it: the chart suggests which sounds answer your elements, and you decide what feels right.
How a Saju chart connects to a name
In Korea and China, a name is traditionally chosen to bring balance to a chart. If the chart lacks water, a name with a water character or a water sound may be preferred. English names are not written in characters, so there is no stroke count to work from. We use sound instead, grouping the consonants into the five elements by where in the mouth they are made, and we are open about the fact that this is our own adaptation.
To see how that works for a real birth date, try the Saju path on the home page, or read our guide on reading name sounds as the five elements.
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