The natal chart does not change. Timing analysis adds moving pillars around it at three scales: Daeun for long phases, Seun for the year, and Wolun for the solar month.
These layers are most useful when they answer a precise question: which stem, branch, element, or Ten God is active now, and how does it relate to the natal chart? They are not three separate fortunes and should not be converted into a single “good luck” score.
| Layer | Typical span | Boundary used here | Best used for |
|---|---|---|---|
| Daeun (대운) | about 10 years | calculated first-cycle age, then ten-year steps | the long background |
| Seun (세운) | one Saju year | Ipchun, not January 1 | the year’s additional pillar |
| Wolun (월운) | one solar month | twelve Jie solar-term boundaries | month-by-month detail |
Daeun: the long background
Daeun advances from the natal month pillar in ten-year cycles. Direction depends on the birth-year stem’s yin or yang polarity together with gender under the convention used by this calculator. The starting age is converted from the interval to the adjacent solar-term boundary.
This site applies the traditional direction convention disclosed in its methodology: yang-year male and yin-year female move forward; yin-year male and yang-year female move in reverse. For a forward chart, the calculator measures from birth to the next Jie boundary. For a reverse chart, it measures back to the previous Jie. It converts the interval with three days equal to one year, retains month-level precision, and then lays out ten consecutive cycles.
The first Daeun therefore does not necessarily begin on a birthday or at a whole-number age. A displayed start such as 6 years 8 months is a calculated boundary, not a prediction that an event must happen that month.
Because schools and apps vary, the result publishes its direction and starting-age assumptions instead of hiding them. When the birth time is unknown, the boundary estimate can also carry a small uncertainty, which the result labels.
Seun: the annual layer
The Saju year begins at Ipchun, not January 1. Each annual pillar can form new stem and branch relations with the natal chart and with the active Daeun. Those relations are evidence to inspect, not promises that an event will occur.
Ipchun is an astronomical solar-term instant, commonly falling near February 4 but not at the same civil time every year. The Korea Astronomy and Space Science Institute almanac publishes the Korean Standard Time and solar longitude of the 24 terms. That is why a birth or annual reading close to Ipchun needs an exact date, time zone, and boundary calculation rather than a fixed February 4 rule.
Read the annual stem and branch twice: first against the natal chart, then against the active Daeun. A relation that repeats across both comparisons deserves attention as a repeated structure, but repetition still does not name a real-world outcome by itself.
Wolun: the monthly layer
Monthly pillars follow the solar months marked by seasonal terms. Selecting a Seun year in our timeline updates its twelve monthly pillars. This makes Wolun useful for seeing how the year’s broad structure changes month by month.
These are not Gregorian calendar months and they do not begin on the first day of each month. The Tiger month begins at Ipchun; later months turn at the next Jie boundaries. The civil-month labels in the interface are orientation aids, while the solar-term instant controls the actual pillar.
Read from large to small
Use the order Daeun → Seun → Wolun. A monthly marker should be interpreted inside its year and long cycle, and all three should still be compared with the natal chart. Smaller timing layers add detail; they do not override the foundation.
A practical reading sequence is:
- Confirm the natal Day Master, visible elements, hidden stems, and major natal relations.
- Find the active Daeun and note what it adds without declaring it favorable or unfavorable in isolation.
- Compare the selected Seun with both the natal pillars and that Daeun.
- Open Wolun only when you need a narrower seasonal window.
- Trace every summary back to the specific stems, branches, Ten Gods, or relations shown in the detailed panels.
Why two calculators may disagree
Differences do not always mean one app is broken. Check these inputs and conventions before comparing screenshots:
- Direction rule: some schools use different gender or polarity conventions.
- First-cycle rounding: an app may round the solar-term interval to whole days or whole years instead of preserving months.
- Boundary data: exact solar-term instants depend on the year and time zone.
- Birth-time handling: unknown time and optional longitude correction can affect boundary distance or the hour pillar.
- Year and day boundaries: January 1 versus Ipchun, or midnight versus the traditional 23:00 day boundary, can change the source chart.
What the result can and cannot tell you
The timing panels can show which traditional symbols become active, where the same relationship repeats, and when a solar-term boundary changes the calculation. They cannot establish that a job, illness, marriage, loss, or windfall will occur. Use them as a dated evidence map for reflection and planning—not as medical, financial, legal, or safety advice.
For exact conventions and verification status, see How this calculator works. Then create your chart and use the connected Daeun → Seun → Wolun navigator to inspect the layers in order.