Luck Pillars

What it is

A Four Pillars chart on its own is fixed for life — it is set at birth and never changes. Luck pillars (대운, daeun, literally "major luck") are what makes a Saju reading say something about this decade rather than only about your fixed nature: they are a sequence of 10-year periods, each carrying its own stem-branch pair, that overlay the static chart in order, starting from an age computed from your birth data and gender.

Each luck pillar's stem is classified as a ten god against your day master, the same way the chart's own pillars are — so a luck pillar is really a 10-year "theme" (a wealth decade, an authority decade, a resource decade) rather than a fixed prediction.

Worked example

For a male born August 5, 1990, the engine gives a luck-pillar sequence that starts at age 2 and runs forward: 甲申 from age 2 to 11 (starting 1991), then 乙酉 from 12 to 21, then 丙戌 from 22 to 31, and so on in 10-year steps. Against this person's actual day master (壬, water — see day master), the first period's stem 甲 (wood) reads as an output god (water generates wood) — traditionally a decade where creative or expressive effort tends to matter more than usual, not a guarantee of any particular outcome.

How Mystica computes it

The free Saju reading computes your luck pillar sequence and its starting age from your birth data using the same lunar-javascript calendar engine as the rest of the chart — but only when you provide your gender, since the traditional forward/reverse direction of the luck-pillar sequence depends on it. Without a gender, the reading still shows your fixed chart in full; the luck-pillar section is simply left out rather than guessing a direction, so nothing on the page calls attention to its absence — if you want the decade-by-decade timeline, come back with a gender specified.