Western Tropical/SYNASTRY
    ✦ Western Tropical Engine

    Western Synastry — Relationship Compatibility

    Overlay two charts to see the literal 'chemistry' between two people in love, friendship, or business.

    Enter Both Profiles

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    First Person

    Date of Birth

    Use exact birth time if known (Optional)

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    Second Person

    Date of Birth

    Use exact birth time if known (Optional)

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    Swiss EphemerisTropical ZodiacPlacidus HousesFree Forever

    What you'll discover

    Understanding romantic chemistry and what drives initial attraction
    Identifying communication friction vs. emotional resonance patterns
    Assessing long-term stability through Saturn contacts
    Business partnership and friendship compatibility analysis
    ✦ Technical Breakdown

    How It Works

    Overlay two natal charts to reveal the exact planetary connections driving attraction, friction, and long-term potential between two people.

    Computation Engine

    We calculate both natal charts independently using Swiss Ephemeris and then measure all inter-chart aspects — the angular distance between each planet of Person 1 and each planet of Person 2. The most critical synastry contacts (Sun–Moon, Venus–Mars, Saturn–Moon, Saturn–Sun) are highlighted with exact orb values and interpretive weight.

    Interpretive Lens

    Synastry shows WHY specific dynamics exist between two people, not whether the relationship will succeed. A Sun–Saturn square from one partner to another explains why the Saturn person may feel restrictive or controlling — while the Sun person may feel suppressed. A Venus–Jupiter trine explains effortless joy and expansion when together.

    Frequently asked questions

    Which synastry aspects indicate the strongest attraction?+

    Venus–Mars contacts (especially conjunction, trine, or square) generate intense physical and romantic attraction. Sun–Moon contacts create familiarity and comfort. Venus–Venus contacts produce aesthetic and value alignment. The most magnetic combinations often involve both attraction AND tension.

    What are the most important synastry contacts for long-term relationships?+

    Saturn contacts to the personal planets (especially Sun, Moon, and Venus) are crucial for commitment and longevity — though they can feel restrictive. Jupiter contacts bring optimism and growth. Moon–Moon harmony indicates emotional attunement.

    Is a composite chart different from synastry?+

    Yes. Synastry shows how two individual charts interact (what each person triggers in the other). A composite chart creates a new midpoint chart representing the relationship itself as an entity — the 'third entity' created by the union.

    Also try the Full Natal Chart

    Calculators reveal one dimension. The full natal chart gives a complete psychological profile across all planets, houses, and aspects.

    Natal Chart →