Free Synastry Chart Calculator
Discover your relationship compatibility through astrological synastry analysis. Compare birth charts and unlock cosmic insights into your relationships.
💡Tips for Accurate Results
- •Exact birth time is crucial for accurate compatibility analysis. If unknown, noon (12:00) is commonly used.
- •Birth location affects planetary positions. Select the closest major city to the actual birth location.
- •Try sample data above to see how the calculator works before entering your own information.
- •All calculations are free and unlimited. Your data is never stored on our servers.
What is a Synastry Chart?
🌟Understanding Synastry Chart Meaning
A synastry chart is a powerful astrological tool that compares two birth charts to analyze relationship compatibility. Unlike a single birth chart that reveals your individual personality, a synastry chart shows how two people interact, connect, and influence each other on cosmic levels.
How It Differs from Individual Charts
What Can You Discover?
Romantic Relationships
A birth chart synastry report reveals romantic compatibility, attraction patterns, and long-term potential
Friendship Compatibility
Understand why you click with certain friends through synastry birth charts analysis
Business Partnerships
Evaluate working relationships and team dynamics using chart synastry
Family Dynamics
Gain insights into parent-child or sibling relationships through astrological comparison
💡 Pro Tip: The most accurate synastry chart requires exact birth times for both individuals. Our free calculator uses Swiss Ephemeris precision for professional-quality results.
What to Look For in a Synastry Chart
When analyzing synastry birth charts, the most important elements are the aspects between planets. Here's your complete guide to understanding each aspect type.
Conjunction
0°The most powerful aspect in chart synastry. When two planets occupy the same degree, their energies merge completely. A highly intertwined synastry chart often features multiple conjunctions, creating deep soul connections.
GOOD FOR:
💡 Sun-Moon conjunction often indicates a profound emotional understanding
Trine
120°The best aspect for long-term compatibility in synastry birth charts. Trines create effortless flow and mutual understanding. This harmonious aspect brings out the best qualities in both individuals.
GOOD FOR:
💡 Venus-Mars trine creates natural romantic and sexual chemistry
Sextile
60°A supportive aspect that creates opportunities for growth in your synastry chart. While it requires some effort to activate, sextiles reward those who work together to develop their relationship potential.
GOOD FOR:
💡 Mercury-Venus sextile enhances communication in love
Opposition
180°The attraction of opposites in birth chart synastry report analysis. Oppositions create magnetic pull and fascination, but require conscious effort to balance. Can manifest as either complementary differences or challenging polarization.
GOOD FOR:
💡 Sun-Moon opposition can create both attraction and tension
Square
90°Squares bring dynamic tension and growth through friction in chart synastry. While challenging, these aspects prevent stagnation and push both partners to evolve. Requires communication and willingness to work through issues.
GOOD FOR:
💡 Mars-Venus square creates sexual tension that needs resolution
Quincunx
150°Less common but significant in synastry birth charts. Quincunx aspects require continuous adjustment and adaptation. These connections feel slightly awkward but teach valuable lessons about flexibility.
GOOD FOR:
💡 Sun-Neptune quincunx requires adjusting expectations
Most Important Planet Combinations in Chart Synastry
Sun-Moon
CriticalThe emotional and identity foundation of any synastry chart
Venus-Mars
HighDetermines romantic attraction and sexual compatibility
Moon-Moon
HighShows emotional compatibility and nurturing styles
Mercury-Mercury
MediumReveals how well you communicate and understand each other
🔍 Want to see your planetary aspects? Use our free synastry chart calculator above to get a detailed birth chart synastry report instantly.
Frequently Asked Questions About Synastry Charts
Everything you need to know about chart synastry and relationship compatibility analysis
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