A fifteen-hundred-year-old map of the exact moment you arrived, read as a description of the constitution you are still working with.
Saju is the Korean refinement of an East Asian calendrical system that has been used continuously for roughly fifteen hundred years. The Chinese call their version BaZi. The Japanese call theirs Shichu Suimei. The Korean version is the most pragmatic of the three — less mystical commentary, more focus on the practical questions a person actually asks about their life.
The system reads you through the precise moment of your arrival. Not just the date — the year you were born, the lunar month within that year, the day within that month, and the two-hour window within that day. Four pillars, each composed of one of ten heavenly stems and one of twelve earthly branches. Each carries one of the Five Elements — Wood, Fire, Earth, Metal, Water — in either a yin or yang form.
The pillar that matters most is the day pillar. Its stem — called the Day Master (일간, ilgan) — is the centerpiece of who you are. The other seventy-five percent of the chart describes the seasonal environment that constitution is living within: what supports your Day Master, what drains it, what challenges it, what you need more of.
Saju produces six layers of signal. Your reading covers all of them — some in a sentence, some in a paragraph, depending on what's loud in your chart.
Your Day Master.
The element + polarity (yin Water, yang Fire, etc.) that describes your default psychological constitution — your factory setting before life shaped you.
Elemental balance.
A tally of all five elements across your four pillars. What you have a lot of (default strengths and over-reliances) and what you're missing (the elemental input your chart hungers for).
Useful element (용신).
The yongshin — the single element that, when present, brings your chart into balance. The thing your life will keep handing you in different forms because you need it.
Relational structure.
The "partner axis" of your chart — what kind of dynamic you create in close relationships, what you tend to attract, where the recurring friction lives.
Wealth + career texture.
Not predictions of bank balance, but the shape of how money and work tend to move through your chart — steady-accumulation versus boom-and-bust, salaried versus founder, narrow expertise versus broad portfolio.
Decade luck cycles (대운).
The dae-un. Every ten years your environment shifts to a new elemental pillar — sometimes one that supports your Day Master, sometimes one that pressures it. The reading names which decade you're currently in, what it asks of you, and what's coming next.
The Saju portion of your Four Mirrors dossier opens with a one-line elemental signature, then moves through temperament, relational structure, wealth, career, and timing. A real opening:
Sample · Anonymised
Day Master: yin Water (癸). Useful element: Wood. You are a deep, observational temperament — the kind that takes in more than it lets on, and processes slowly. Your chart is heavy on Metal and light on Wood, which means you tend to over-structure your decisions and forget to ask whether the structure was worth it. The Wood you need is creative output — making things, particularly verbal ones. Salaried environments will feel safe but slowly suffocating; the work that fits is generative, with editorial control. You are entering your fourth dae-un now (yin Wood, 2026–2036) — the first decade in two cycles where the environment actively supplies what your chart has been missing.
The four pillars are computed deterministically from your exact birth time and the historical Chinese–Korean lunar calendar. We use the Korean ilju-pa convention (slight differences from Chinese BaZi for edge cases around solar terms). The day boundary is set at 11pm Asian standard, not midnight.
The computation is mechanical and reproducible — give the same inputs, you get the same pillars. The interpretation is where the work happens: which patterns in your specific chart are loud enough to name, which are quiet but structural, which are noise.
That interpretive layer is written by an AI fluent in classical Saju texts (mostly translated from Korean sources, some from Chinese BaZi cross-references) — then personally reviewed by hand before it reaches your inbox. More on the human edit.
All four mirrors,
read against each other.
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