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Synastry: Relationship Compatibility Charts

Discover the cosmic chemistry between you and your partner. Learn how your birth charts interact to reveal love potential.

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What is Synastry?

Synastry is the art of comparing two birth charts to understand relationship dynamics. When you overlay one person's chart on another's, you can see exactly how their planets "talk" to yours—revealing attraction, compatibility, challenges, and growth potential.

Every relationship—romantic, friendship, family, professional—has a unique astrological fingerprint. Synastry reveals the cosmic forces at play between two souls.

Key Synastry Aspects for Love

Aspect Meaning Strength
Venus conjunct MarsIntense physical attraction, magnetic chemistry★★★★★
Sun conjunct MoonDeep emotional understanding, feeling "at home"★★★★★
Venus trine VenusShared values, easy affection, aesthetic harmony★★★★
Moon conjunct AscendantInstant comfort, emotional recognition★★★★
Sun trine SunCore identity compatibility, mutual respect★★★★
Jupiter conjunct VenusExpansive love, generosity, joy together★★★★

Challenging Aspects (Not Always Bad!)

These aspects create friction but often indicate passion and growth:

Venus square Mars

Push-pull dynamic, intense but stormy attraction

Moon square Saturn

Emotional walls, feeling criticized or restricted

Sun opposite Pluto

Power struggles, intense transformation

Mars square Mars

Competitive energy, arguments, but also passion

💡 Astrologer's Insight: The "best" synastry charts have a mix of flowing AND challenging aspects. Too much ease can lack spark; too much friction burns out. Balance is key.

House Overlays: Where You Impact Each Other

When someone's planet falls into one of your houses, that life area is activated:

Their Planet in Your... Meaning
1st HouseStrong personal attraction, impact on self-image
5th HouseRomance, fun, creativity—dating energy!
7th HouseMarriage indicator, partnership potential
8th HouseDeep intimacy, transformation, shared resources
4th HouseFeeling like family, emotional security

Get Your Synastry Reading

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Synastry vs. Composite Charts

Synastry

  • Two separate charts overlaid
  • Shows how you affect each other
  • Reveals individual dynamics
  • Best for: understanding interactions

Composite

  • One blended chart
  • Shows the relationship as an entity
  • Midpoint of both charts
  • Best for: relationship purpose/destiny

How to Read Your Synastry Chart

  1. Look at Sun-Moon connections: Do your Sun and Moon signs harmonize? This shows basic compatibility.
  2. Check Venus-Mars aspects: These reveal romantic and sexual chemistry.
  3. Examine house overlays: Where do their planets fall in your chart? This shows where they impact your life.
  4. Note Saturn aspects: These indicate staying power—or restrictions—in the relationship.
  5. Balance positives and challenges: No chart is all good or all bad—look at the full picture.

Synastry FAQs

Common questions about relationship astrology

What is a synastry chart?

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A synastry chart overlays two people's birth charts to analyze their relationship compatibility. It shows how one person's planets interact with another's, revealing areas of harmony, attraction, challenge, and growth potential in the relationship.

What's the difference between synastry and composite charts?

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Synastry: Compares two separate charts—shows how you affect each other
Composite: Creates one blended chart—shows the relationship as its own entity
Both are valuable: synastry reveals dynamics between you, composite shows what you create together.

What are the most important synastry aspects for love?

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Key romantic aspects include:

  • Venus-Mars: Sexual attraction and passion
  • Sun-Moon: Core identity harmony
  • Venus-Venus: Shared values and affection style
  • Moon-Moon: Emotional understanding
  • Ascendant aspects: Immediate attraction and first impressions

Can synastry predict if a relationship will work?

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Synastry reveals compatibility potentials and challenges—not guarantees. A chart with difficult aspects can still work with awareness and effort, while an "easy" chart doesn't guarantee success. Synastry shows what you're working with, not what you'll do with it.

What if we have many squares and oppositions?

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Challenging aspects aren't necessarily negative—they often indicate passion, intensity, and growth opportunities. Many successful relationships have squares and oppositions. The key is awareness: knowing where friction exists helps you navigate it consciously.

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