Synastry
Compare two charts to understand relationship compatibility.
Synastry is the astrological method of comparing two natal charts to explore the dynamics of a relationship. By overlaying one person's planets onto the other's houses and examining the inter-chart aspects, you can identify where a partnership flows easily, where it generates friction, and where both individuals have the strongest potential for mutual growth.
The technique works for any kind of relationship -- romantic partnerships, friendships, family bonds, or professional collaborations. What matters is how the two symbolic maps interact. When one person's Venus lands in another's seventh house, for instance, the relational field naturally gravitates toward affection and partnership themes. When Mars in one chart squares Saturn in the other, the pair will likely encounter recurring tension around autonomy, timing, and control -- tension that, when worked with consciously, can become a powerful engine for maturity.
This section provides house overlay guides (what happens when each of your partner's planets falls in each of your houses), aspect-by-aspect analyses (conjunction through opposition for every major planet pair), and specialized articles on outer-planet contacts, Lilith aspects, and nodal connections. The goal is always the same: to move from "why does this person push my buttons?" to "how can we use this dynamic constructively?"
Browse Sections
Sun Aspects
Moon Aspects
Mercury Aspects
Venus Aspects
Mars Aspects
Jupiter Aspects
Saturn Aspects
Outer Planet Aspects
Lilith Aspects
Vertex
Juno
House Overlays
How one person's planets fall in the other's houses.
Aspects
Inter-chart aspects that define the dynamic between two people.
Cusp-Planet Aspects
Asteroids
Ascendant Aspects
Asteroid Aspects
Chiron Aspects
Midheaven Aspects
Midpoints
Neptune Aspects
Node Aspects
Pluto Aspects
Sign Compatibility
Uranus Aspects
Articles
6 articles
Introduction to Synastry
Learn the foundations of synastry: how comparing two birth charts reveals relational dynamics, growth edges, and patterns of interaction between two.
Challenging Synastry Patterns: What to Be Aware Of
Learn which synastry patterns require extra awareness and how to work with challenging planetary dynamics constructively in relationships.
How to Read a Synastry Chart: Step-by-Step
A practical step-by-step guide for reading synastry charts, from assessing individual charts to identifying the most significant interaspects.
Synastry Compatibility Score: The Discepolo Method
Calculate your synastry compatibility score with the Discepolo method. A step-by-step, research-backed scoring system for relationship astrology.
The Most Powerful Synastry Aspects: Which Connections Matter Most
Which synastry aspects experienced astrologers consider most significant and why certain planetary connections carry more weight than others.
Dynamic Aspects in Synastry: Squares and Oppositions
Statistical research on over 2,000 couples reveals that Sun squares and oppositions appear most frequently in lasting relationships. Explore the evidence.
Frequently Asked Questions
- Is synastry only for romantic relationships?
- Not at all. Synastry applies to any two-person dynamic: parent and child, business partners, close friends, even long-standing rivalries. The chart comparison reveals the archetypal themes at play between two people regardless of the relationship type. The same Venus-Mars contact might manifest as romantic chemistry in one pairing and creative collaboration in another.
- What is the difference between synastry and a composite chart?
- Synastry keeps the two charts separate and examines how they interact -- think of it as a conversation between two individuals. A composite chart blends both charts into a single midpoint chart that represents the relationship itself as its own entity. Many astrologers use both techniques together for a fuller picture.
- Can a challenging synastry aspect be a good thing?
- Absolutely. Squares and oppositions between charts create dynamic tension that often drives growth, passion, and engagement. Relationships with only harmonious aspects can sometimes lack the friction needed for depth. The key is whether both people are willing to work with the tension consciously rather than acting it out reactively.