When your Luck Pillar changes

Your Luck Pillars start from your month pillar and step through the 60-pair cycle of stems and branches, one pair for each ten-year stretch. Your result shows ten of them. Your Natal Chart, the eight characters fixed at birth, stays the same for life; each Luck Pillar is a pair of characters laid over it for its decade. In the Plain view they appear as the ten-year cells under "The flow of your life", and in the Detailed view as the Luck Pillars table.

The sequence runs one of two ways. If your year stem is yang and you are male, or yin and you are female, it moves forward from the pillar after your month pillar. Otherwise it runs in reverse, from the pillar before it. So a brother and sister born in the same minute get sequences running in opposite directions, and their starting ages can differ too.

The age your first Luck Pillar opens is counted in days. Going forward, we measure from your birth to the next Solar Term Boundary; in reverse, from the previous one to your birth. That number of days is divided by three and rounded to a whole number, so three days stand for one year. A result of 0 becomes 1, the cap is 10, and solar-term times are used to the second.

Take a man born in Seoul at 14:30 on May 12, 1990. His year stem, 庚 (Geng), is yang, so his Luck Pillars run forward. The next boundary, Grain in Ear (Mangzhong), is 24.72 days away. Divided by three that is 8.24, so his starting age is 8, and his first Luck Pillar, 壬午 (Ren Wu), begins in 1998. A woman born at the same moment runs in reverse, starting at age 2 with 庚辰 (Geng Chen).

Each new Luck Pillar begins ten years after the last. AevoStar marks the change by year, not by date: once today's year in Korea time reaches a pillar's start year, the "Now" marker moves to it.

A traditional reading treats the handover between two Luck Pillars as a time to take care and keep steady. Retold often enough, that advice can turn into "something bad happens the year your Luck Pillar changes." Here is what the calculation can and can't tell you.

When the pillar changes, the pair read over your chart is different, so the themes that come first in a reading can shift. We describe that as a change in where your attention tends to go, not as an event lying in wait. If the year still weighs on you, use it to look back at the past decade and note what you'd like from the next one.

We take your solar birth year and add your starting age. That counts years since birth, the way ages work in most of the world. Calculators that use East Asian age reckoning, where you are one at birth, show the same pillar a year higher. The Luck Pillars section of our calculation guide has the details.

Rounding can tip it too. 25.4 days divided by three is 8.47, which rounds to 8; 25.6 days gives 8.53, which rounds to 9. Some methods keep the remainder instead, reading three days as a year and one day as four months, so a starting age reads like "8 years 4 months" and the change lands partway through a year.

Without a birth time, a birth in Korea is read at noon standard time, and a birth elsewhere at noon on the local clock. That can be up to half a day off, enough to move the starting age by a year, and your result says so. Since the change year moves with these rules, it's hard to treat any single year as one to fear.

After you enter your birth details:

1. Switch to the Detailed view at the top of your result.
2. Under "Luck Pillars · Forward" (or Reverse), a line such as "Every 10 years from age 8" gives your starting age, followed by how ages are counted.
3. The pillar marked "Now" shows its starting age and its years. If your first pillar hasn't begun yet, you'll see the year it starts.
4. Open "How was the starting age set?" for the direction, the reference solar term, the moment it began, the day count and the starting age. The day count is shown to three decimal places.
5. "See the whole Luck Pillars table" lists all ten with their starting ages and start years.

In the Plain view, the same stretches appear under "The ten years you are in" and "The flow of your life". Luck Pillars are reference information from traditional theory for reading a stretch of time; they don't settle in advance what any year holds.