Synastry: The Astrology of Relationship Compatibility

What Is Synastry?

Synastry is the art of relationship astrology - comparing two natal charts to understand the dynamics between two people. It reveals attraction, challenges, strengths, and the overall compatibility of any relationship type.

What Synastry Can Tell You

• Romantic compatibility and chemistry
• Communication patterns between partners
• Areas of harmony and tension
• Long-term potential
• What each person teaches the other
• Sexual compatibility
• Emotional connection depth

The Most Important Synastry Aspects

1. Sun-Moon Aspects

What it shows: Emotional and ego compatibility

• Conjunction/Trine: Deep understanding, feel like soulmates
• Square/Opposition: Different emotional needs, growth through challenge

2. Venus-Mars Aspects

What it shows: Romantic and sexual attraction

• Conjunction: Intense physical attraction
• Trine/Sextile: Natural romantic flow
• Square: Passionate but conflicting desires
• Opposition: Magnetic attraction with tension

3. Moon-Moon Aspects

What it shows: Emotional compatibility

• Same element: Natural emotional understanding
• Compatible elements: Complementary emotional needs
• Challenging aspects: Different emotional languages

4. Venus-Venus Aspects

What it shows: Shared values and love languages

• Harmonious aspects: Similar relationship values
• Challenging aspects: Different needs in love

5. Mercury Aspects

What it shows: Communication compatibility

• Mercury-Mercury harmonious: Easy conversations
• Mercury-Sun: One person understands the other's identity
• Mercury-Moon: Emotional understanding through words

Karmic Synastry Indicators

North Node Conjunctions

When someone's planet touches your North Node, they help you grow toward your destiny.

South Node Conjunctions

Past life connections - feels familiar and comfortable but may be karmic lessons to transcend.

Saturn Aspects

Saturn creates commitment and longevity but can feel restrictive:

• Saturn-Sun: Serious, committed, long-term potential
• Saturn-Moon: Emotional responsibility and maturity
• Saturn-Venus: Delayed but stable love

Red Flags in Synastry

Challenging Aspects to Watch

• Mars-Mars squares: Power struggles, competition
• Saturn-Moon harsh aspects: Emotional coldness
• Pluto-personal planet squares: Control issues, obsession
• Neptune-Venus: Illusion in love, idealization

Note: These aren't dealbreakers! They just show areas requiring conscious awareness.

House Overlays in Synastry

Where someone's planets fall in your houses shows what areas of life they activate:

Important House Overlays

• 1st House: Strong physical attraction, identity influence
• 4th House: Family-like comfort, desire for home together
• 5th House: Romance, fun, creative connection
• 7th House: Partnership-oriented, marriage potential
• 8th House: Intense intimacy, transformative
• 10th House: Public couple, professional partnership
• 12th House: Spiritual connection, hidden dynamics

Composite Charts vs. Synastry

Synastry

Compares two individual charts - shows how you relate AS individuals

Composite

Blends two charts into one - shows the relationship itself as an entity

Use both for complete understanding!

Beyond Romance: Synastry for All Relationships

Synastry works for:

• Friendships
• Business partnerships
• Parent-child dynamics
• Coworker relationships
• Any connection between two people

Calculate Your Synastry

Use our free compatibility calculator to generate complete synastry analysis between two charts. See your planetary aspects, house overlays, and compatibility score.