It begins with four units of time

The basic structure of Saju begins with the year, month, day, and hour of birth.[1]

These four units of time are described as four Pillars.

So the chart begins with these four parts:

Year · Month · Day · Hour

At this stage, we are identifying the structure of the chart, not interpreting a person’s personality or future.

Each Pillar contains two characters

Each Pillar is represented by two characters, making eight characters across the four Pillars.[1]

This eight-character structure is one reason the Korean expression Saju Palja is used.

4 pillars × 2 characters = 8 characters

Understanding this simple structure makes it easier to connect the chart later with the Heavenly Stems and Earthly Branches.

The two characters form a Stem–Branch pair

The two characters in each Pillar form a pair of a Heavenly Stem and an Earthly Branch.[1]

The full chart therefore consists of four Stem–Branch pairs: one for the Year, one for the Month, one for the Day, and one for the Hour.

This article does not explain the individual meanings of the ten Heavenly Stems or the twelve Earthly Branches. It also does not explain which Element a character belongs to or what personality trait it might represent.

For now, it is enough to understand one structural idea: each Pillar contains a Stem and a Branch together.

Position and interpretation are different things

The existence of Year, Month, Day, and Hour positions is one thing. Assigning specific family, personality, or event meanings to those positions is another step.

This article deals only with position and structure.

So it does not establish claims such as:

- a certain Pillar determines the fate of a certain family member;
- a certain position determines career or marriage outcomes;
- one Pillar by itself is enough to judge a person’s life.

Knowing the chart structure and interpreting an individual should remain separate tasks.

Vertical layout is not the main point here

In Saju charts, you may encounter layouts that place Heavenly Stems and Earthly Branches vertically.

But this display format is not part of the minimal structure that readers need to learn in this introductory article.

For that reason, this article does not teach a particular vertical screen or table arrangement as a required rule of Saju.

The important relationship to remember is not the visual arrangement but the structure itself:

Year · Month · Day · Hour → Four Pillars → one Stem–Branch pair in each Pillar → eight characters in total