Western Compatibility
Synastry Analysis
Enter birth details for two people to get a complete Western compatibility report — Venus–Mars aspects, Sun–Moon connections, Rising overlays, Saturn contacts, and more.
✦ Free · Swiss Ephemeris · Tropical zodiac
Check Your Compatibility
Enter birth details for both people below
What Your Synastry Report Covers
Eight areas of inter-chart analysis — every one of them relevant to how two people actually experience each other.
Venus–Mars Aspects
The attraction axis. How Venus (love, receptivity) and Mars (desire, initiative) interact between two charts determines the spark and physical drawing.
Sun–Moon Aspects
The emotional resonance axis. Sun–Moon conjunctions and trines create a deep sense of recognition — 'I feel at home with you.'
Rising Sign Overlay
How does each person see the other? The Ascendant overlay reveals first impressions, physical attraction, and the public face of the relationship.
Mercury Aspects
Communication compatibility. Do you understand each other easily, or is there friction in how you think and express yourselves?
Saturn Contacts
Long-term glue. Saturn aspects indicate karmic ties, responsibility, and whether this feels serious and lasting — or restricting.
Moon–Moon & Moon–Venus
Emotional compatibility. How your emotional natures meet, and whether you nurture each other's inner worlds.
7th House Activations
Which of your planets land in the other person's 7th house (the house of partnership)? These create profound relationship pull.
North Node Contacts
Karmic destiny connections. North Node aspects in synastry indicate a relationship that feels fated and pushes both people toward growth.
How It Works
What is Western Compatibility (Synastry)?
Synastry is the branch of Western astrology that compares two birth charts to understand how two people interact. Your planets are overlaid on the other person's chart — and vice versa. The angles (aspects) formed between planets tell a story about attraction, tension, communication, emotional resonance, and long-term potential.
When your Venus conjuncts someone's Mars, there is almost certainly a magnetic physical attraction. When your Saturn squares their Sun, there may be a feeling of pressure or restriction in how they express themselves around you. When your Moon trines their Moon, emotional understanding flows naturally.
Synastry does not predict whether a relationship will succeed — it describes the dynamics and energies that the two people are working with. Understanding those dynamics helps you navigate them more consciously.
Attraction
Venus, Mars, and Ascendant contacts show the spark and physical draw between two people.
Emotional Bond
Moon contacts and 4th house overlays show emotional safety and depth of feeling.
Long-term Fit
Saturn and North Node aspects show the karmic weight and lasting potential of the connection.
Real questions. Real answers.
Every answer comes from the actual aspects between your two charts — not generic horoscope advice.
Why do we feel such a strong pull toward each other even when things are difficult?
Is this a karmic relationship or a practical, lasting one?
What do our charts say about long-term compatibility?
Why is communication so easy with this person?
What does the synastry say about physical attraction and intimacy?
Western Synastry vs Vedic Kundali Matching
They answer different questions — both are valuable.
Western Synastry
Focuses on how two people feel around each other — psychological dynamics, attraction patterns, communication, emotional compatibility.
Vedic Kundali Matching
Focuses on whether a marriage will be harmonious — Guna Milan score, Dosha analysis, progeny compatibility, and karmic alignment.
Frequently Asked Questions
Everything you need to know about Western compatibility analysis
What is synastry in Western astrology?+
Synastry is the method of comparing two birth charts to understand how two people interact. Each person's planets are overlaid on the other's chart, and the angles (aspects) formed between planets reveal areas of harmony, attraction, tension, and growth. It's the most widely used compatibility technique in Western astrology.
What is the most important factor in synastry?+
There's no single most important factor — compatibility is shown through multiple overlapping indicators. However, inter-chart aspects between Venus, Mars, the Moon, and the Sun are generally considered the most significant for romantic relationships. 7th house overlays and North Node contacts are also highly meaningful.
What does Venus–Mars synastry mean?+
When one person's Venus aspects the other's Mars (especially in conjunction or trine), it's one of the strongest indicators of physical attraction and romantic interest. Venus brings affection and receptivity; Mars brings initiative and desire. This combination creates the classic 'chemistry' described in synastry.
What is a Sun–Moon conjunction in synastry?+
A Sun–Moon conjunction between two charts is considered one of the most powerful compatibility indicators in synastry. The Moon person feels emotionally seen and nurtured by the Sun person. The Sun person feels revitalized by the Moon person's emotional support. This is often found in long-term relationships and marriages.
What are hard aspects in synastry? Are they bad?+
Hard aspects (squares, oppositions) create tension, friction, and challenge — but not doom. Many long-lasting, passionate relationships have significant hard aspects in synastry, particularly between Mars and Saturn. The key is whether both people have the maturity to work with the tension rather than against each other.
How is Western compatibility different from Kundali matching?+
Vedic Kundali matching (Guna Milan) uses the Ashtakoota point system based on Moon Nakshatra compatibility, and is excellent for assessing long-term harmony, progeny, and karmic compatibility. Western synastry focuses on psychological and emotional dynamics between two people — how they actually feel around each other, communicate, and grow together. They answer complementary questions.
Do I need my exact birth time for synastry?+
An accurate birth time gives you the Ascendant, house positions, and precise Moon degree — all of which significantly improve synastry analysis. Without it, you can still analyze Sun, Venus, Mars, Mercury, Jupiter, and Saturn aspects, which covers a large part of compatibility. The more accurate the birth time, the more detailed and precise the reading.
✦ Free · Swiss Ephemeris · Tropical zodiac
Check Your Compatibility
Enter birth details for both people below