Clear Saju
Your chart, and the calculation behind it.
Korean Four Pillars astrology, with the calculation shown Free, with no account and no email.
What you get, free
- Your four pillars, with the Chinese characters and plain-English names
- The exact calculation behind them — time zone, solar time, solar term
- Your Day Master and what it is used for
- Your five-element composition
- One reflection question
Most sites give you the answer. We give you the working.
The time zone rule in force on your birth date, the solar time correction for your city, and the solar term your birth falls in — all of it, on every chart.
How this was calculated
Most sites tell you the answer. These are the exact inputs behind yours.
- Birth time as entered
- 1987-08-01 14:20
- Time zone applied
- Asia/Seoul
- UTC offset at birth
- +600 min
- Daylight saving in effect
- Yes
- DST anomaly
- None
- Resolved UTC instant
- 1987-08-01T04:20:00.000Z
- Clock policy applied
- local mean solar time
- Shift from your clock
- -92.1 min (your longitude against the time-zone meridian)
- Equation of time
- Not applied
- Longitude offset from UTC
- +507.9 min (raw local mean solar offset, before your time zone is taken off)
- Time used for the chart
- 1987-08-01 12:47:54
- Day boundary rule
- day changing at 23:00
- Solar term in effect
- Minor Heat (Soseo)
- Solar term instant (UTC)
- 1987-07-07T15:45:01.927Z
- Distance from that term
- 24 days 12 hours
What Saju is
Saju reads a birth moment as four pairs of Chinese characters — a year, month, day and hour pillar. Eight characters in total, which is why it is also called the Four Pillars of Destiny.
Western astrology sorts people into twelve sun signs. Saju does not: the four pillars combine into 518,400 distinct charts, and the reading starts from the heavenly stem of your day pillar, called the Day Master.
It is a traditional interpretive system with a long written record. We treat it as a lens for self-reflection, not as a forecast.
Free and paid
Free
- Your four pillars and Day Master
- The full calculation behind them
- Which of the five elements your chart leans on
Full reading · USD 27.90
- Seven areas read against your chart
- Every section cites the part of your chart it came from
- A PDF, uploaded to your Etsy order within 24 hours
One-time purchase. No subscription.
How we keep this honest
- The same birth details always produce the same chart. The calculation is deterministic.
- We publish the rules we adopted and the corrections we apply.
- No AI is involved. Your chart is calculated, and the reading is assembled from published rules.
- If your birth moment falls too close to a boundary we cannot resolve, we say so instead of guessing.
We do not publish an accuracy figure. There is no meaningful one to publish for a traditional interpretive system, and we would rather show the calculation than claim a number.
Questions
- Do I need my exact birth time?
- For the full reading, yes. Without a birth time we can produce three of the four pillars, and the hour pillar and everything that depends on it will be unavailable. We do not sell a partial reading.
- Why does the time zone matter so much?
- Because the rules that changed over the last century actually move the chart. Korea used a different standard time until 1961 and ran summer time in 1987 and 1988. We apply the rule that was in force on your birth date, not today’s.
- Is this a prediction?
- No. Korean Saju is a traditional interpretive practice. We use it for self-reflection, not as a forecast, and we do not make claims about health, money, or relationships as future facts.
- Do you keep my birth details?
- The free chart is calculated in your browser. Your birth date, time and city are not sent anywhere to produce it.
- What do I get if I pay?
- Seven areas read against your own chart, each citing the part of the chart it came from, as a PDF, uploaded to your Etsy order within 24 hours. One-time purchase, no subscription.
Start with the free chart
A date, a time, a city. That is the whole form.
Free chart
Three questions
No account. Your birth details stay in your browser.