Daeun — the ten-year cycle

Your eight characters never change. What changes is the pair of characters layered over them for each decade of your life. Those are your luck pillars — daeun.

This is the centre of the system, and it is what English-language coverage of Saju almost always leaves out.

How it works

From your month pillar, the sequence of sixty steps forward or backward — the direction set by your gender combined with the polarity of your birth year. Each step lasts roughly ten years.

So a chart starved of Water for thirty years might enter two consecutive Water decades in its forties. It is the same chart. It does not behave the same way at all.

Why your decades do not start at zero

Luck pillars do not begin at birth. They begin at an age calculated from how far your birth moment sat from the nearest solar term boundary — roughly three days of distance per year of delay.

This is why one person changes decade at 3, 13, 23 and another at 9, 19, 29. Two people born in the same week can be out of step with each other for their entire lives.

What it actually explains

Most people, shown their daeun for the first time, recognise the boundaries before they are told what they mean. The years something changed and stayed changed tend to land on them.

That is the honest pitch for this part of the system: not that it predicts, but that it gives a structure to periods of life that otherwise feel arbitrary. The bad stretch you could not explain was frequently a decade whose characters were working against your chart.

And the honest limit

A decade sets conditions. It does not deliver outcomes. The tradition is clear that the chart describes weather rather than what you do about it, and any reading that tells you an outcome is guaranteed has left the tradition behind.