Korean Destiny Astrology
Saju Palja
사주팔자 · 四柱八字
Four moments. Eight characters. A lifetime of patterns.
Your birth year, month, day, and hour each become one heavenly stem above one earthly branch, four pillars, eight characters. Korean masters read them the way you'd read a house: which season it was built in, what holds it up, where it strains. This hub is a school hiding inside a reading. Every conclusion will eventually trace back to the chart, the calculation, and the rule that produced it.
Saju is a Korean practice within a shared East Asian Four Pillars tradition, its own vocabulary, teachers, consultation culture, and time conventions. A reflective tradition, not a science of guaranteed events.
Where your chart begins
Before anything is cast, we resolve when and where you were born, because Korean Saju corrects the clock to true solar time, and Korea's own standard time has changed across history. Give the gate your birth details and it casts your eight characters with the deterministic engine, and shows exactly how each was calculated. This is the calculation, not the fortune, the reading that interprets these characters is the next phase.
Your assumptions & boundary report appears here. It shows which Korean standard meridian applied to your birth date, the true solar time correction for your longitude, and whether you were born close to a boundary where reasonable schools disagree, Ipchun, the late-night Zi hour, or an hour edge. This is the machinery a "Chinese calculator with Korean labels" would quietly get wrong.
Defaults follow SAJU_CALCULATION_ASSUMPTIONS.md: true solar time on, standard meridian selected by era, Ipchun year boundary, midnight day-rollover with 야자시/조자시 offered as a documented setting. Every disputed rule is logged in the rule conflict matrix rather than silently chosen.
A house raised in four stages
Your birth splits into four moments: the year, month, day, and hour you were born. Saju turns each moment into one pillar, a Heavenly Stem (천간, on top) stacked over an Earthly Branch (지지, below). Four pillars make the eight characters. The Day pillar's stem is you, the Day Master that the whole reading turns around.
The Heavenly Stem (천간) is one of ten and carries an element in its yin or yang form. The Earthly Branch (지지) is one of twelve and carries a season and a zodiac animal. A stem and a branch together name one pillar out of sixty possible pairs.
The four below are just an example. Your own pillars come from your exact birth date, time, and place. Enter them in the Birth Gate and the engine raises your real chart, with its own characters.
Nyeonju
Year
Built from your birth year, counted from Ipchun in early February, not January 1.
It speaks to ancestry, early life, and the world you were born into.
Wolju
Month
Built from the solar-term month of your birth, so it tracks the true season.
The season, and the single strongest influence on the whole chart.
Ilju
Day
Built from your birth day in the ceaseless 60-day cycle.
The self and your closest partnerships. Its stem is your Day Master (일간).
Siju
Hour
Built from your two-hour birth window, after the true-solar-time correction.
Later years, output, and legacy. The pillar most sensitive to true solar time.
New to the characters themselves? Meet the ten stems and twelve branches, and what each element carries.
Ten stems, twelve branches
Every character is drawn from two small alphabets. The ten heavenly stems (천간, cheongan) carry the Five Elements in their yin and yang forms. The twelve earthly branches (지지, jiji) carry the seasons and the familiar zodiac animals, and each hides one to three stems inside it.
The ten Heavenly Stems
甲 乙 丙 丁 戊 己 庚 辛 壬 癸
Wood, Fire, Earth, Metal, Water, each as a yang and a yin stem. Your Day Master is one of these ten, and the season it was born into decides whether it stands strong or thin.
The twelve Earthly Branches
子 丑 寅 卯 辰 巳 午 未 申 酉 戌 亥
The Rat through the Pig, but in Saju they are seasons and hours, not just animals. Branches combine, clash, and punish one another, and those interactions drive the timing of a life.
The hidden stems
Inside each branch, one to three stems lie hidden, the jijanggan. They are why a chart is deeper than its eight visible characters. We store their traditional order and seasonal role, never a made-up percentage dressed as science.
The Korean words you'll actually use
We introduce a Korean term only when it earns its place, always with romanization and meaning. Here are the load-bearing ones. English first, then Revised Romanization, Hangul, and Hanja.
Where the Korean system goes its own way
The stems, branches, and the sexagenary count are shared across the whole East Asian Four Pillars family, we'll draw that parallel to Chinese BaZi when it helps you learn. But three Korean conventions change the actual chart, and an engine that ignored them would hand you the wrong pillars.
True solar time is a Korean default
Korea's clock runs on the 135°E meridian, but Seoul sits near 127°E, so the clock is about 32 minutes ahead of the real sun. Korean Manseryeok subtracts that before setting the hour pillar. Standard Chinese practice on Beijing time doesn't, and near an hour boundary that flips the whole hour pillar.
Korea's meridian changed by era
Korea used GMT+8:30 from 1908, GMT+9 under Japanese rule from 1912, back to GMT+8:30 from 1954 to 1961, then GMT+9 again. A correct engine picks the meridian by birth date. The same wall-clock birth in 1955 and 1965 gets a different true solar time.
The late-night day dispute
The traditional day starts at 23:00, the civil day at midnight. For births in that final hour, Korean schools genuinely disagree on which day's Day Master applies, which is why two apps can give the same person two charts. We surface the choice instead of hiding it.
Learn to read it yourself
This hub is a school hiding inside a reading. Work the drills and you'll derive a chart the way a reader does, stems and branches, the five-element relations, the Ten Gods, seasonal command, strength, and timing. You climb the seven ranks by getting fresh questions right, never by clicking through. Cast your chart above and some drills will use it; the rest draw on varied sample charts so you learn the rule, not one example.
What this reading is, and what it never claims
Saju can be culture, symbolic reflection, and a genuine interpretive craft. It is not a science of fixed outcomes, and we build that honesty into the product, not just the footer.
Every fortune here carries agency: a pattern the tradition notices, why the timing may raise it, the range of ways it can appear, a constructive choice, and a question for you.
- We never predict death, illness, pregnancy or fertility, crime, lawsuits, wealth, or a partner's behavior as certainties.
- We separate historical doctrine, Korean convention, one lineage's rule, symbolic reading, and our own product inference, and we label which is which.
- Difficult timing is described as pressure and attention, never as doom or a curse.
- Your birth data is private by default, never in a URL, a share link, analytics, or the page source.
- We credit the Korean vocabulary and the broader East Asian origins, and we plan Korean practitioner review before calling any reading authoritative.
Where this comes from
Nothing here is invented. Foundational claims trace to Korean academic, institutional, and documented practitioner sources, tiered by reliability. The full ledger lives in the repository.
Open the source ledger
- AAcademy of Korean Studies, "Saju," Encyclopedia of Korean Culture. Definition and cultural framing.
- AKim Man-tae, "A Field Study of Modern Saju-Myeongri Counseling," 2025 (Korea Citation Index). Consultation as counseling.
- AChoi Won-ho, "A Study on True Solar Time Correction in Eastern and Western Countries," 2023 (KCI). Basis for the longitude correction.
- BTime in South Korea, standard-time history (1908 / 1912 / 1954 / 1961; 127.5°E vs 135°E).
- AHong Kong Observatory, Gan-Zhi sexagenary cycle and Gregorian–Lunar conversion.
- BUNESCO Hong Kong, the 24 solar terms (month-pillar boundaries).
- CKorean practitioner sources on 진태양시 correction and the 야자시/조자시 dispute, labeled as living convention, not academic fact.
Full detail with URLs, tiers, and limitations: docs/saju/research-v2/SAJU_SOURCE_LEDGER_V2.md. Commercial calculators are used only for output comparison, never copied.
Raise your four pillars
Give the Birth Gate your moment and watch the Korea-specific machinery work, honestly, with every assumption shown.
Korean Destiny Astrology is offered as a tradition of meaning for reflection and study. It is not medical, psychological, financial, or legal advice, and it does not predict fixed events.