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Saju guide

Daeun and Seun: Ten-Year and Yearly Luck Cycles in Saju

A birth chart stays fixed, but saju also reads time. Learn how daeun, the ten-year cycles, and seun, the yearly pillars, are calculated and layered over a chart.

A saju chart is a snapshot of one moment, and a snapshot does not move. Yet Korean readers talk constantly about change: "my daeun just turned," or "this year's seun is heavy on Fire." Those remarks refer to two layers of time laid over the birth chart. Daeun (大運) are ten-year cycles that differ from person to person. Seun (歲運) are the pillars of individual saju years, shared by everyone. This guide starts with what the two layers are and how they are read, then shows where the numbers come from.

Two clocks over one chart

Daeun is the slow clock. The first character means "big," so the word can sound like a promise of good luck, but in saju it only means a large unit of time. Everyone has a sequence of daeun, one after another, each lasting about ten years. A particular cycle can be described as comfortable or demanding for a given chart; the term itself is neutral.

Think of the birth chart as a house and each daeun as the street it stands on for ten years. The house stays the same, but the light, noise and traffic around it change, so the same tendencies may show up quite differently from one decade to the next.

Seun is the fast clock, and the easier one to grasp. Each year has its own stem and branch, and that pair is laid next to the birth chart. 2025 was Eulsa, 2026 is Byeongo, 2027 is Jeongmi, and 2028 will be Musin. Like the year pillar in a birth chart, the seun turns at Ipchun in early February, not on January 1.

Months have pillars too, called worun. They change at solar terms rather than on the first of the calendar month, and readers treat them as a finer, lighter layer.

How readers put the layers together

Readers usually stack the layers in order: the birth chart first, then the current daeun, then the current seun. A common image calls the daeun the season and the seun the weather. A hot year during a decade already rich in Fire may be read as intense, while the same hot year during a cold, Water-heavy decade may be read as welcome warmth.

Each layer is read the way any character in the chart is read. The reader asks which of the ten relationship types, the sipseong, the incoming stem and branch form with the day master, and whether the incoming branch clashes or combines with branches already in the chart. A new-year reading is essentially a seun reading. Hongsil's new-year reading switches to the following year in October, so from October 2026 it looks at 2027, the Jeongmi year, against your chart.

The years around a change of daeun get particular attention. Readers often describe them as a transition, when routines, surroundings or circles of people can shift. They avoid pinning this to a single month, though, since the exact turning point depends on the counting method described below.

Where the ten-year cycles come from

Daeun are built from the month pillar of the birth chart. Starting there, the cycles step through the sixty-pillar sequence one position at a time, either forward or backward, and each step covers one decade.

Suppose the month pillar is Gapjin. Moving forward, the cycles run Eulsa, Byeongo, Jeongmi and onward. Moving backward, they run Gyemyo, Imin, Sinchuk and so on. Each cycle is therefore a stem-and-branch pair like any other pillar. To see the full run for a given birth, people usually turn to a traditional calendar table, called a manseryeok, or to a chart tool that lists daeun.

Forward or backward

The traditional rule sets the direction from two things: whether the year stem is yang or yin, and the sex recorded at birth. The yang stems are Gap, Byeong, Mu, Gyeong and Im; the yin stems are Eul, Jeong, Gi, Sin and Gye.

So 2026, Byeongo, is a yang-stem year, and 2027, Jeongmi, is a yin-stem year.

Practice here is not uniform. Most chart tools follow the classical rule. Some modern readers question tying direction to sex at all, and they handle the question in different ways, including for people whose gender does not fit the old categories. There is no single agreed answer, so it is worth knowing which convention a given reading uses.

The age when the first cycle begins

The first daeun does not begin at birth. Its starting age, often called the daeun number, comes from the distance between the birth and one of the twelve solar terms that open a saju month: the next one when the cycles run forward, the previous one when they run backward.

The number of days is divided by three, on the old reckoning that three days correspond to one year of life. Someone with twelve days to the relevant term would start the first cycle around age four, then change again around fourteen, twenty-four and so on.

Methods diverge on the details. Some readers round, some carry the remainder into months, and some calculate down to the hour. Two tools may therefore give starting ages that differ by a year, and both may be following a recognized method.

FAQ

Is a "bad" daeun a bad decade?

Readers generally avoid that framing. A cycle describes the conditions of a period, and each year inside it brings its own seun. A demanding cycle is often read as a time for building skills or laying groundwork.

Is a daeun change like a Saturn return?

The two get compared because both mark a turn in life's phases, but they work differently. A Saturn return in Western astrology follows one planet's orbit and arrives at roughly the same age for everyone. Daeun steps come from your own month pillar and day count, so the turning ages differ from person to person.

Why does my daeun differ between two websites?

The usual causes are the direction rule, the way the day count is rounded, the handling of births close to a solar term, and the birth time entered. A birth date near a month boundary can change the month pillar itself, which shifts every cycle built from it.

Related

Part of the dotorium saju guide. Saju readings are for fun and reflection, not for making decisions.