The Four Pillars of Saju: What Year, Month, Day and Hour Each Cover
four pillars saju · Education
A saju chart is four columns. Each column, or pillar, holds a Heavenly Stem on top and an Earthly Branch below, and each one is cut from a different slice of your birth data. This guide walks through what each pillar is traditionally read for, why two of the eight positions carry extra weight, and why those traditional associations are a starting point rather than a verdict.
If the words stem, branch and pillar are still new, read Saju Meaning: How to Read the Labels on Your Chart first. It explains the vocabulary; this page explains the positions.
Pillars as positions, not just dates
The same character can mean something different depending on where it sits. A 甲 in the year column and a 甲 in the hour column are the same stem, but traditional reading treats them as speaking about different parts of life. That is why readers often call the four pillars palaces (궁, 宮): each is a room in the chart with its own theme.
A common teaching image is a plant growing over time. The year pillar is the root, the month pillar the stem, the day pillar the flower and the hour pillar the fruit. It is a memory aid, but it captures two ideas most schools share: the pillars run from your background to your future, and from the people around you inward to yourself.
What each pillar is traditionally read for
| Pillar | Korean | Comes from | Traditional themes | Life stage often linked |
|---|---|---|---|---|
| Year | 년주 (nyeonju) | Birth year, changing at Ipchun | Ancestors, family background, the wider society you were born into | Childhood |
| Month | 월주 (wolju) | Solar-term month | Parents and siblings, upbringing, your working environment | Youth and early adulthood |
| Day | 일주 (ilju) | Birth date | The self (stem) and a close partner (branch) | Adulthood |
| Hour | 시주 (siju) | Two-hour birth block | Children, younger people, what you produce and leave behind | Later life |
Schools do not agree on the details. Some split a lifetime into fixed age bands for each pillar, others only use the order loosely, and many put far more weight on how the characters relate to one another than on the life-stage labels. Treat the right-hand column as a reading habit, not a timetable.
The year pillar
The year pillar describes where you start from: family line, background and the generation you belong to. Its lower character is the familiar zodiac animal. Because saju changes the year at Ipchun, the start of spring in early February, a January birthday usually belongs to the previous year's pillar. Korean Zodiac Animals and Saju: Why Your Chart Year Can Differ shows how to check yours.
The year pillar is shared with everyone born in the same saju year, so on its own it says little about you as an individual.
The month pillar
The month pillar is read for the people who raised you, your siblings and the setting you grow and work in. Its branch carries special weight: it marks the season of your birth. In Korean this position is called wollyeong (월령, 月令), the month command. Many practitioners look at it first when judging which elements in a chart are strong, because a wood stem born in spring and the same stem born in autumn are read very differently.
The month changes at solar terms, not on the first of the calendar month, which is why your saju month can differ from the month on your ID.
The day pillar
The day pillar is the centre of the chart. Its stem is your Day Master (일간, ilgan), the reference point every other character is compared against. How to Find Your Day Master shows where to find it on your result.
Its branch, directly below, is traditionally called the spouse palace (배우자궁, baeujagung) and is read for close partnership. That label describes a position, not a person: it does not tell you who you will meet or when.
The hour pillar
The hour pillar is read for children, younger people, long-term projects and later life. It is the only pillar that needs a birth time. If yours is unknown, the hour column stays open and the other three pillars are unaffected. Saju Birth Time: What the Hour Pillar Needs explains what you keep and what you lose.
How the pillars connect to one another
The pillars are not four independent boxes. Two of the stems are derived from their neighbours by fixed rules:
- The month stem follows the year stem. In a 甲 year, the first saju month, the Tiger month, always takes 丙. Each year stem sets its own starting point, so the same month branch carries different stems in different years.
- The hour stem follows the day stem. On a 甲 day, the Horse hour always takes 庚.
The day pillar itself comes from an unbroken sixty-day cycle, which is why two birthdays a week apart in the same month can have completely different Day Masters.
A worked example
Take a made-up birth at 12:00 on 10 February 2024. The chart is 甲辰 for the year, 丙寅 for the month, 甲辰 for the day and 庚午 for the hour.
| Pillar | Characters | Read as a position |
|---|---|---|
| Year | 甲辰 | Background: a wood stem over the Dragon, the familiar zodiac animal for this birth |
| Month | 丙寅 | Season: the Tiger branch marks early spring, a wood season |
| Day | 甲辰 | Self: Day Master 甲, yang wood; spouse palace 辰 |
| Hour | 庚午 | Later life and output: a metal stem over the Horse |
Notice that the year and day pillars hold the same pair, 甲辰. A reader would still treat them differently, because one speaks to background and the other to the self. Notice also how the month and hour stems follow the rules above: 甲 year to 丙 month, 甲 day to 庚 hour.
Reading your own chart in order
- Start with the day stem. It is you, and it is the reference point for everything else.
- Look at the month branch next. It sets the season and tells you which elements are in their prime.
- Read the day branch as the closest relationship position.
- Add the year and hour pillars for background and later life.
- Only then look at how the characters relate to one another, through the elements and the ten gods.
What the pillar themes cannot do
- They do not describe your family. A year pillar labelled "ancestors" is a theme, not a fact about your grandparents.
- The spouse palace is not a forecast. It is a position that readers interpret; it does not predict a partner, a marriage or a breakup.
- The life-stage bands are not deadlines. No pillar switches on at a set birthday.
- Different schools weight them differently. If two readers stress different pillars, that is a difference in method.
Next step
Generate your free chart, write down the four pillars, and label each one with the theme from the table above. Free Saju Reading: What You Get Without Paying explains exactly what the free chart on PillarAtlas includes.
Entertainment-only disclaimer
PillarAtlas charts and guides are for learning, self-reflection and entertainment. They are not medical, psychological, financial or legal advice, and no outcome is guaranteed.