About sǹg-miā

Get the chart right first. Then let the AI talk.

I'm a product manager in software. Taking things apart is the job, so when everyone started using large language models, I fed one my own birth chart.

It answered with total confidence. It took me a while to spot the problem: I was born just after 11pm, and it had rolled me over to the next day. In this system that shifts the entire chart. Everything it said afterwards was built on the wrong one.

Cast a free chart

The twelve branches sit in fixed positions. Palaces and stars are calculated once your birth details are in.

Charts calculated in codeRules checked by handAI only does the explaining
01

It started as a shortcut

My thinking was simple. If a model can draft documents and dig through research, it can probably handle this too. It is a rule system, after all.

It could not. The language was fluent, but it was not casting a chart — it was producing something chart-shaped. Leap months, the boundary hours either side of midnight: it never flags any of that. It just keeps going, sounding certain.

02

So the chart gets built before the AI sees it

I have been reading these systems since I was a student — Zi Wei Dou Shu, Ba Zi, tarot. Zi Wei Dou Shu came first here because it behaves most like software: twelve palaces, a few dozen stars, fixed rules for how the Four Transformations travel.

So the order is reversed. The system calculates the chart, and only then does the AI get involved. What it receives is not your birthday. It is a finished chart.

03

About the name

sǹg-miā is how you say fortune telling in Taiwanese Hokkien — roughly sng-mia. The sǹg part also means to play.

I like that overlap. Reading a chart should not feel like bracing for bad news. Learning what sort of person you are is not the same as being handed a verdict.

04

Machines calculate, the AI just explains

No model touches the calculation. Lunar conversion, hour boundaries, where each star lands — all of it runs on fixed rules. If it comes out wrong that is a bug, not a model having an off day.

Once the chart is settled, the structured result goes to the AI, which turns the terminology into something you can actually read.

  • Lunar calendar and leap-month handling
  • Early and late Zi hour support
  • True solar time and birthplace longitude correction
  • Twin chart handling
  • Separate readings for love, career, decade cycles and annual timing
05

Ba Zi and tarot are next

Zi Wei Dou Shu is only the first. Ba Zi, tarot and Western astrology are all on the list, but each one has to be taken apart rule by rule, so it will not be quick.

Something I kept coming back to while building this: most people who look up their chart want time to think a problem through with someone. The answer matters less than that.

06

What we will not tell you

None of this is medical, legal or financial advice, and you will not find a sentence here saying your life is already decided. A chart shows tendencies. It does not show endings.

The site runs in Chinese, English, Japanese and Korean. What you do after reading is yours to decide.

Start here

Free chart calculatorGenerate the full Zi Wei chart
Decade & life mapUnderstand ten-year cycles
Annual fortune guideRead this year's rhythm
Career analysisWork strengths and pressure points
Relationship checkRelationship patterns and blind spots
Social patternsWhere you tend to stand in a group
Parent and childYour child's temperament, read from the Children Palace
A reading earns its keep when it makes a decision easier to make.
sǹg-miā