Your saju chart never changes — but your daewoon (대운) does. Every ten years you enter a new major luck cycle: a decade-long pillar whose element and character interact with your birth chart and color everything from career timing to relationships. This guide explains how daewoon is calculated, how to find which decade you are in now, what a cycle change traditionally means, and how to see your own chart and current cycle free.
The four pillars of your birth — year, month, day, hour — are fixed the moment you are born. Korean saju calls this the wonguk (원국), your base chart. The daewoon is the weather moving across that landscape: a sequence of decade pillars, each with its own Heavenly Stem and Earthly Branch, that begins at a starting age unique to you and advances every ten years for the rest of your life.
This is why saju readings care so much about timing. The same chart in a Fire decade and a Water decade is read very differently — the chart describes the instrument, the daewoon describes the music currently being asked of it.
Daewoon comes from your month pillar and your exact birth date. The classical method runs in four moves:
The theme of a daewoon comes from how its element pair relates to your Day Master. In Sip-sin terms:
| Decade dominated by | Traditional emphasis |
|---|---|
| Officer stars (관성) | Structure, responsibility, rank, public roles — a career-and-duty season |
| Output stars (식상) | Expression, creation, output — building, teaching, making things visible |
| Wealth stars (재성) | Resources and results — managing assets, business activity, practical gains |
| Resource stars (인성) | Learning, credentials, support — study, mentorship, inner consolidation |
| Peer stars (비겁) | Independence and competition — standing alone, partnerships, self-definition |
None of these are good or bad in themselves. A demanding Officer decade can be the most productive of a life; a quiet Resource decade can set up everything that follows. The reading is about fit between the season and your choices.
Traditionally, the year or two around a daewoon boundary is read as a transition — the old decade's element pair fading while the new one establishes. Korean readers often describe it as a change of season: the same person, different weather. It is the single most common reason adults in Korea revisit their saju, because a chart that felt "settled" starts answering differently.
If you have ever felt a life chapter close around a round-numbered age without an obvious external cause, this is the saju vocabulary for that experience. Whether you treat it as description or coincidence, it is a useful prompt for reflection at decade scale.
A luck cycle is not a verdict. Daewoon does not predict specific events, name dates, or guarantee outcomes — and no honest reading claims it does. It offers a decade-scale frame: which themes are likely to feel emphasized, supported or strained. What you build inside that frame remains your work.
It differs per person — anywhere from shortly after birth to around age ten — because the starting age depends on the distance between your birth and the nearest solar term. That is also why two people born days apart can have cycle boundaries years apart.
No. Daewoon is the ten-year cycle; seun (세운) is the yearly layer that runs inside it. Korean readers usually read them together: the daewoon sets the decade's theme and the seun describes each year's variation on it.
Yes. The cycle sequence derives from your month pillar and birth date, so the decade timeline works without an hour. Your birth time refines the base chart that each decade interacts with — useful, but not required for the timeline itself.
The free Cheonmyeongdang calculator builds your four pillars from your birth date and hour and shows your Day Master, element balance and current ten-year cycle context in plain English.