Free synastry chart — your two birth charts, crossed at home.
Your birth, theirs — and the bi-wheel appears: your chart inside, theirs outside, read in your houses. The contacts between your planets, from the tightest to the widest, with their exact orb. Nothing is sent: neither your birth, nor theirs.
The lines of the wheel
- Conjunction same degree
- Opposition face to face
- Square the tension
- Trine the ease
- Sextile the opening
- Dashed a contact on an angle (Ascendant, Midheaven)
- The angles yours in solid gold, theirs in dashed blue
What this page does not do
It does not grade you. No percentage, no compatibility score — and we will not give you one: what two charts do together does not add up, it is read.
It interprets no contact: it says which aspect, at which orb, in which house — not what it does between you, nor what each of you awakens in the other.
And it does not know who you are to each other. A reading crosses everything, both ways.
The contacts between you
On your angles
Your points
Their points
What you can check for yourself.
Where do our two birth dates go?
Nowhere. Both charts and every contact are computed in your browser: neither your birth nor theirs leaves for a server, is written to a cookie, or is stored anywhere. That also settles the question of the other person’s consent: no one but you sees what you type. You can check it without taking our word for it: open your browser’s developer tools, Network tab, then run the calculation. The counter at the bottom of this page makes the same measurement and shows the result live.
Why is there no compatibility score?
Because it would be false. A synastry gives contacts and their orbs; a percentage would add up things that do not add up — a Venus-Mars conjunction and a Moon-Saturn square do not cancel each other out, they are read together. We give you the exact calculation, and we will not sell you hope in the shape of a number.
Why is their chart read in my houses?
That is the convention of the bi-wheel: the chart in the center sets the houses, the outer chart is placed on them. “Their Mars in my seventh house” tells you which area of your life their planet falls in — the very sentence one looks for in synastry. To read it the other way round, simply swap the two blocks: you move outside, and the wheel is re-read in their houses.
What if one of us does not know the birth time?
The planets in signs and the contacts between your planets remain exact: they do not depend on the time. What is missing on that side is the Ascendant, the Midheaven and the houses — and the Moon, which moves thirteen degrees in a day: placing it without the time would invent contacts, so it is not placed. If your time is the one missing, the wheel is read in the other person’s houses.
Is this the same calculation as your synastry reading?
Yes — the same engine, the same orbs, the same list of contacts, automatically checked against the documents we sell. What changes in the written reading is not the calculation: it is what is done with it. It crosses every contact with both whole charts, both ways, and names what each of you awakens in the other — which this page, not knowing who you are, cannot do.
Measuring the network…