Free Synastry Chart Calculator

Discover your relationship compatibility through the cosmic language of astrology

Quick Start with Sample Data

Try the calculator instantly with pre-filled example data

1Person 1

Enter birth information for the first person

Type manually or click the dropdown to search from 5,000+ cities

Type manually or click the dropdown to search from 88 timezones

2Person 2

Enter birth information for the second person

Type manually or click the dropdown to search from 5,000+ cities

Type manually or click the dropdown to search from 88 timezones

💡Tips for Best Results

  • •Use accurate birth times for precise calculations
  • •Select the closest city to your birthplace
  • •Explore both harmonious and challenging aspects

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

📊
Birth Chart: Your personal cosmic blueprint showing planetary positions at your birth
💕
Synastry Chart: The interaction between two birth charts, revealing relationship dynamics

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.

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Conjunction

0°
Intense Union

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:

Deep bondingIntense connectionSoulmate indicators

💡 Sun-Moon conjunction often indicates a profound emotional understanding

💙

Trine

120°
Natural Harmony

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:

Easy communicationNatural compatibilityLong-term stability

💡 Venus-Mars trine creates natural romantic and sexual chemistry

💚

Sextile

60°
Growth Opportunities

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:

Personal growthMutual supportPositive development

💡 Mercury-Venus sextile enhances communication in love

🧡

Opposition

180°
Magnetic Tension

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:

Balance through contrastPassionate attractionLearning from differences

💡 Sun-Moon opposition can create both attraction and tension

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Square

90°
Dynamic Challenge

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:

Growth through challengeKeeping things dynamicBuilding resilience

💡 Mars-Venus square creates sexual tension that needs resolution

💛

Quincunx

150°
Adjustment Required

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:

Learning adaptabilityDeveloping patienceSubtle growth

💡 Sun-Neptune quincunx requires adjusting expectations

Most Important Planet Combinations in Chart Synastry

1

Sun-Moon

Critical

The emotional and identity foundation of any synastry chart

2

Venus-Mars

High

Determines romantic attraction and sexual compatibility

3

Moon-Moon

High

Shows emotional compatibility and nurturing styles

4

Mercury-Mercury

Medium

Reveals 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

Ready to Explore Your Synastry Chart?

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Also Try: Free Astrocartography Calculator

Discover where in the world you'll thrive. Find your best locations for career success, love, health, and personal growth based on your birth chart. 100% free with interactive world map.

Astrocartography reveals how different locations on Earth affect your life based on your birth chart. Find out where you'll thrive in career, love, health, and spirituality using our interactive world map.

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