Want to explore the deeper dynamics of your relationship? A synastry chart compares two birth charts to reveal how your planets align with someone else’s—offering rich insights into love, connection, and cosmic chemistry.
To get started, just enter the following for both people:
Full names
Birth dates
Places of birth (or nearest city)
Birth times (optional, but recommended for accuracy!)
If no birth time is available, the chart defaults to noon.
Imagine the sky at the exact moment you were born—this snapshot is your birth chart. Now imagine placing someone else’s chart on top of yours. The way their planets interact with yours reveals unique aspects of your relationship.
This is what a synastry chart does:
It overlays two natal charts to show how you and another person influence one another emotionally, mentally, and even spiritually.
The chart looks like a standard astrology wheel (a full 360° circle divided into 12 houses), but contains double the planetary symbols—one set for each person.
Aspects are angles formed between planets in the two charts. These can indicate harmony, tension, passion, or growth. Common aspects include:
Conjunctions – strong focus or fusion of energy
Trines – easy flow, natural compatibility
Squares – challenges that require growth
Oppositions – magnetic tension and polarity
Each of these tells part of your relationship story.
While both explore relationships:
Synastry shows how two individuals affect one another.
Composite charts blend both charts into one to reveal the relationship itself as an “entity.”
Synastry helps answer questions like:
Why do we click so well?
Where do we clash?
How can we grow together?
At Astro-Charts, astrology meets modern design and precision. We use up-to-date NASA data for all planetary positions, and we handle all the technical stuff for you—like daylight saving time and geographic adjustments.
You’re in control! Choose from:
Different house systems
Sidereal or tropical astrology
Custom orb limits
Show or hide planets, asteroids, aspects, and more
We even take feature suggestions to keep things fresh and user-friendly.
Astro-Charts helps you discover advanced chart formations like:
Stelliums
Grand Trines
T-squares
Yods
Star of David
… and over 17 other rare patterns.
These add depth and nuance to your interpretation.
You’ll also get fascinating extras like:
The Moon phase at your birth
Your dominant element (Earth, Air, Fire, Water)
Your chart’s most powerful planet
And more bite-sized facts that bring your chart to life
Ready to explore your connection on a deeper level?
Try the free Synastry Chart tool and unlock the secrets of your relationship through the stars. 💘
To use the calculator properly, please note that it is only available in the original version of the page without translation!
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