Synastry is the astrological art of comparing two birth charts to understand how two people relate to each other. It’s one of the most practical applications of astrology — and one of the most revealing.
How Synastry Works
The technique is straightforward: place two natal charts on top of each other and examine how one person’s planets aspect the other’s. These cross-chart connections reveal the natural dynamics between two people.
For example, if your Venus conjuncts your partner’s Mars, there’s a strong physical and romantic attraction built into the relationship. If your Saturn squares their Moon, emotional expression may feel restricted or tested.
The 5 Most Important Synastry Aspects
1. Sun-Moon Connections
The most fundamental compatibility indicator. When one person’s Sun harmoniously aspects the other’s Moon, there’s a natural understanding between conscious identity and emotional needs.
2. Venus-Mars Aspects
Chemistry and attraction. Venus represents what we desire; Mars represents how we pursue. Their interaction between two charts reveals romantic and sexual dynamics.
3. Mercury-Mercury Aspects
Communication compatibility. How easily two people understand each other’s thinking style, humor, and conversational rhythm.
4. Moon-Moon Aspects
Emotional resonance. Whether two people feel emotionally safe and understood with each other at a gut level.
5. Saturn Aspects
Commitment and structure. Saturn connections bring stability and longevity but can also introduce restriction. They often indicate karmic or fated relationships.
House Overlays
Beyond aspects, synastry examines where your partner’s planets fall in your natal houses. If their Sun lands in your 7th house of partnerships, you naturally see them as a partner. If their Venus falls in your 5th house, they activate your romantic and creative side.
Get Your Synastry Report
Want to see the full picture of your relationship dynamics? Open Tvastar in Telegram and use /synastry to get cross-aspects, house overlays, and AI interpretation for your relationship.