Zodiac Compatibility
Enter the first person's birth details.
This compares both full natal charts, not just sun signs, so the results reflect emotional fit, chemistry, and friction points.
What Is a Synastry Chart?
The real science behind astrological compatibility.
Data Points Analyzed
Planetary Bodies Compared
Aspect Combinations
More Than Just Sun Sign Matching
A synastry chart overlays two people's birth charts to reveal how their planetary energies interact. Unlike simple zodiac sign matching — which only considers the Sun and covers roughly 15% of the picture — synastry examines every planet, house, and aspect between both charts.
Why Full Chart Analysis Matters
Two people with “incompatible” Sun signs can share deeply harmonious Moon, Venus, or Ascendant connections that create an unshakable bond. Conversely, matching Sun signs might mask challenging Mars or Saturn cross-aspects. Synastry captures the full story that sun sign columns miss entirely.
The 7 Planets That Shape Your Relationship
Each planet governs a different dimension of how two people connect.
Sun
Core Identity
Shows how your fundamental identities interact. Strong Sun contacts mean you naturally understand each other’s goals, values, and sense of self.
Moon
Emotional Safety
Reveals how emotionally safe you feel together. Moon aspects determine whether you instinctively nurture each other or trigger insecurity.
Venus
Love Language
Governs how you express affection and what you find attractive. Venus contacts show whether your love languages naturally align or need translation.
Mars
Passion & Drive
Controls physical chemistry and how you handle conflict. Mars aspects reveal whether disagreements fuel growth or destructive patterns.
Mercury
Communication
Shapes how you think and talk together. Mercury contacts determine whether conversations flow easily or require extra effort to bridge different mental styles.
Saturn
Commitment & Stability
The glue that holds relationships together long-term. Saturn aspects show where you build structure, but also where you might feel restricted.
Jupiter
Growth & Expansion
Where you help each other grow. Jupiter contacts bring optimism, generosity, and shared adventures. It’s the planet that makes the relationship feel like it’s expanding your world.
Synastry Aspects Explained
Aspects are the angular relationships between planets in two charts. They are the building blocks of compatibility.
Trine (120°)
The easiest flow of energy between two charts. Trines create natural understanding and effortless support. Venus trine Moon, for example, means emotional warmth flows naturally between you.
Venus △ Moon = emotional ease and natural affection
Sextile (60°)
A gentle, cooperative aspect that opens doors when you make an effort. Sextiles suggest compatible energies that blossom with a little initiative from both sides.
Mercury ✱ Jupiter = stimulating conversations and shared curiosity
Harmonious aspects feel easy but still need conscious effort to fully activate their potential.
How AI-Powered Compatibility Analysis Works
From birth data to personalized insight in under 30 seconds.
Enter Birth Details
Provide the birth date, time, and location for both people. If birth time is unknown, ChartNova uses noon as a default and marks house positions as approximate.
Astronomical Calculation
Our engine computes exact planetary positions, house cusps, and all cross-aspects between both charts using professional-grade astronomical data accurate to sub-arcsecond precision.
AI Synthesizes Your Reading
Unlike template-based reports, our AI analyzes the entire chart holistically — identifying patterns, themes, and nuances that a simple aspect list cannot capture. Your reading is delivered in seconds, not days.
Instant delivery, not 24-hour waits
Traditional compatibility reports cost $25+ and take hours or days to receive. ChartNova delivers a complete AI-powered reading in seconds — with the same astronomical precision.
Synastry Chart vs. Composite Chart
Two different lenses for understanding a relationship.
| Synastry Chart | Composite Chart | |
|---|---|---|
| What it shows | How two people interact with each other | The relationship as its own entity |
| Method | Overlays both birth charts side by side | Calculates midpoints of both charts into one |
| Best for | Understanding attraction, friction, and dynamics | Understanding the relationship’s purpose and themes |
| Reveals | What each person brings to the table | What the relationship feels like as a unit |
| When to use | Early stages, evaluating compatibility | Long-term partnerships, understanding shared goals |
For the most complete picture, astrologers recommend examining both. Start with synastry to understand the dynamic between you, then use a composite chart to explore where the relationship itself is headed.
Ready to Discover Your Compatibility?
Enter both birth details above and get your full synastry chart in seconds. Free, no signup required.
Not Just for Lovers
Synastry works for any relationship where two people interact.
Romantic Partners
Explore emotional compatibility, physical chemistry, communication style, and long-term potential. See where you naturally click and where growth is needed.
Business Partners
Analyze Mercury and Saturn cross-aspects to understand communication and accountability dynamics. Discover whether your working styles complement or clash.
Family & Friends
Understand Moon and Jupiter connections that shape emotional bonds, generosity, and mutual support. Helpful for navigating family dynamics or deepening friendships.
Do You Need Exact Birth Times?
Accurate birth times improve the reading, but you can still get meaningful results without them.
With Birth Time
- Precise house placements show where each planet's energy plays out
- Accurate Ascendant reveals first-impression chemistry
- Moon position is exact, refining emotional compatibility
- Full 100% of available data points are analyzed
Without Birth Time
- Planetary signs and cross-aspects are still fully accurate
- House placements are marked as approximate (noon default)
- Moon position may be off by up to 6 degrees
- Still captures ~80% of available compatibility data
Tip: Check your birth certificate, hospital records, or ask a parent for your exact birth time.