Saju Basics — How to Read Yourself Through Heavenly Stems, Earthly Branches, and the Five Elements
Saju (四柱八字, the Four Pillars of Destiny) is the heart of Myeongni, the East Asian art of fate that has been passed down for over a thousand years. As the name suggests, it means 'four pillars (四柱)' and 'eight characters (八字)': it translates the moment of a person's birth into symbols to read their innate temperament and the flow of their life. It can feel intimidating, but once you grasp a few basic concepts, anyone can read the big picture of their own chart.
Saju is time rendered as symbols
Saju is not a mystical prophecy but a table that records four units of time — the year, month, day, and hour of your birth — as two characters each, eight characters in all. The old Eastern calendar marked each day, month, and year with 'ganji (干支),' a cyclical notation of sixty branches, and Saju simply draws the four cells corresponding to the moment you were born from that very calendar. That is why casting a Saju is called 'setting up a chart,' and the precise calendar it rests on is called the Manseryeok (the perpetual calendar).
Ten heavenly stems and twelve earthly branches
The eight characters are made of two kinds of symbols. The top row is the 'Cheongan (天干),' the ten heavenly stems — Gap, Eul, Byeong, Jeong, Mu, Gi, Gyeong, Sin, Im, Gye — and the bottom row is the 'Jiji (地支),' the twelve earthly branches — Ja, Chuk, In, Myo, Jin, Sa, O, Mi, Sin, Yu, Sul, Hae. The twelve branches pair with the twelve zodiac animals we know, such as the rat, ox, and tiger. If the heavenly stems represent the energy of heaven — the tendencies and mind that show on the surface — then the earthly branches represent the energy of earth: the concrete foundation, inner feelings, and environment.
How the four pillars are built
The year pillar (年柱) marks the year of birth, the month pillar (月柱) the month divided by the solar terms, the day pillar (日柱) the day of birth, and the hour pillar (時柱) the hour divided into two-hour units — each shown as a single pair of ganji. Two things deserve attention here. First, the boundary of a month is set not by the first of the solar-calendar month but by the twenty-four solar terms, such as Ipchun and Gyeongchip. Second, if you don't know your birth hour, most readings are still possible using the three pillars without the hour pillar. So for an accurate chart, your birth date matters, and where possible your birth hour, along with whether the date is lunar or solar.
The Day Master — the 'self' at the center of the chart
The single most important character among the eight is the heavenly stem of the day of birth, the 'Day Master (Ilgan, 日干).' The Day Master symbolizes 'you yourself' in the chart, and all seven remaining characters are interpreted in relation to it. For example, if the Day Master is 'Gap (甲),' the person is seen as born with the energy of a great tree, read as upright and inclined to reach upward. When you first look at your own Saju, the whole picture becomes far clearer once you check what your Day Master is and which of the Five Elements it belongs to.
The balance of the Five Elements and body-strong versus body-weak
Each of the eight characters belongs to one of five energies: Wood (木), Fire (火), Earth (土), Metal (金), and Water (水). A major axis of reading a Saju is seeing how evenly, or how lopsidedly, these five energies are distributed. When the energies that support the self (the Day Master) are plentiful, the chart is 'sinstrong (身強, body-strong)'; when the energies that drain the self are plentiful, it is 'sinweak (身弱, body-weak).' The element that fills and regulates whatever is lacking or excessive — either way — is called the 'yongsin (用神, the useful god).' Knowing your yongsin is a practical key to knowing which colors, directions, and lines of work suit you.
Saju is not a verdict announcing a fixed fate; it is closer to a map that reads the tendencies of your innate temperament and life's flow so you can handle yourself better. Now that you have the broad framework, set up your actual chart from your own birth date and check your Day Master, Five Elements, and yongsin for yourself.