What Is Saju (사주 / 四柱)? Korea’s Four Pillars Tradition

The word saju literally means four pillars (四柱). Your year, month, day, and hour of birth each become one pillar, known as the year pillar, month pillar, day pillar, and hour pillar. Together they act as four coordinates in time that support a whole life.

Each pillar has two characters, one stacked on the other. The upper character is the Heavenly Stem (천간 / 天干) and the lower one is the Earthly Branch (지지 / 地支). Four pillars therefore yield eight characters in total, and these eight are collectively called palja (팔자 / 八字). The familiar Korean phrase saju-palja comes from exactly this combination.

These eight characters are not arbitrary symbols; they encode the time of your birth. Two people born on the same day but at different hours will have different hour pillars, which is why saju asks for as precise a birth time as you can give, on top of the date.

There are ten Heavenly Stems (천간), usually called the Ten Stems: gap, eul, byeong, jeong, mu, gi, gyeong, sin, im, and gye. There are twelve Earthly Branches (지지): ja, chuk, in, myo, jin, sa, o, mi, sin, yu, sul, and hae. These twelve are the same characters as the well-known twelve zodiac animals (rat, ox, tiger, and so on).

When the ten stems and twelve branches pair off in sequence, they produce sixty distinct combinations, known as the sixty-year cycle (육십갑자 / 六十甲子). This is why a 60th birthday (환갑) was traditionally celebrated so warmly: it marks the point where the stem-and-branch of your birth year completes a full cycle and returns to its start.

Another core language of saju is the five elements (오행 / 五行): wood (목 / 木), fire (화 / 火), earth (토 / 土), metal (금 / 金), and water (수 / 水). Every Heavenly Stem and Earthly Branch is assigned one of these elements.

The five elements both nourish and restrain one another. Wood feeds fire, fire makes earth, earth bears metal, metal holds water, and water grows wood again. In the other direction, water puts out fire and fire melts metal. Reading a saju chart begins with examining this balance: which elements are abundant in your eight characters, and which are scarce.

If you had to choose the single most important of the eight characters, it would be the Day Master (일간 / 日干): the Heavenly Stem of your day pillar. In this tradition, the Day Master represents you yourself. The other seven characters are read as the environment and relationships surrounding that self.

For example, if your Day Master is a wood element, a reading asks whether your chart has enough water to nourish that wood, or too much metal that keeps cutting it back. The same wood reads very differently depending on its surroundings. This is why saju is less about good characters and bad characters and more about the balance of the whole arrangement.

A daily fortune comes from a concept called iljin (일진 / 日辰): the stem-and-branch assigned to a given day, in other words today’s own pillar. By looking at how today’s iljin interacts with your eight birth characters, we can read the texture of the day.

If today’s iljin carries an element you tend to lack, the day may feel more supportive; if it piles onto an element you already have in excess, the reading might suggest a more careful pace. CrossFates’ daily reading follows this principle, placing today’s iljin alongside the saju you enter to summarize the day’s flow.

Saju is an old framework for reflecting on a person through yin-yang and the five elements, not a prophecy that fixes the future. CrossFates’ saju readings are for self-reflection and entertainment, and important decisions about health, law, or finances should always be made with a qualified professional.