Saju (사주) means literally “four pillars” — the year, month, day and hour of your birth written as pairs of characters, a heavenly stem and an earthly branch. The most important is the stem of the day, the day master: that is you, and everything else is read against it. The month is not taken from the civil calendar but from the solar terms — which is why a month turns around the fourth or fifth day, not the first.
Start with your own profile — once calculated, the partner match (synastry of two people) and the ancestral section where you add a partner and children unlock below the result.
Frequently Asked Questions
Yes — entirely and permanently, with no registration and nothing locked away. It exists to help.
No. The calculation runs without a database; the only memory of a result is the unique URL in your browser. The exception: a voluntarily entered e-mail (for results or the daily digest) is stored with the birth data it needs.
Planetary positions come from the astronomy-engine library (~0.003° accuracy); the Human Design engine exactly reproduces Ra Uru Hu’s published chart and the design chart uses the exact 88° of solar arc. The full methodology is published in Sources & Methodology.
We use 12:00 and the result flags time-sensitive values (ascendant, profile) where the exact minute matters. Your Human Design type is usually stable even with an approximate time.
A synthesis of the I Ching, astrology, Kabbalah and the chakra system: your birth date, time and place produce a bodygraph — a map of your energy with a type, strategy and inner decision-making authority.
Yes — Relationship Match works for partners, children, parents and colleagues, including a two-page narrative synastry. Children can get their own full chart too.
The address in your browser carries the whole input, partner and children included — just copy it. You can also save profiles locally in your browser and download the result as a PDF.
The ascendant changes roughly every two hours and near a cusp the exact birth minute decides; tropical vs. sidereal zodiacs differ too. Our card warns you when you sit on a sign boundary.
Everything at once
Your mechanics
The sky above you
Calendar systems
Numbers and names
As a pair
You answer