Dictionary term
Synastry
Direct answer
Synastry is relationship astrology that compares two birth charts to study attraction, friction, compatibility, timing, projection, and mutual activation.
Synastry compares two charts to interpret relationship dynamics.
Synastry compares two charts to interpret relationship dynamics.
A structural orientation; exact placements depend on the chart or technique being discussed.Quick reference
- Use when
- Use Synastry for romantic, friendship, family, business, mentorship, and client questions where two charts interact.
- Do not use it for
- Do not use Synastry to decide someone's worth or force a relationship conclusion.
- In astrology
- Synastry reads contacts between planets and points across two charts, especially the Moon, Venus, Mars, Saturn, angles, nodes, and house overlays.
- Reference category
- Astrology
- Related terms
- Birth Chart, Composite Chart, Venus, Mars
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The story behind Synastry
Chart comparison is a longstanding astrological practice, with modern synastry adding psychological relationship language.
Synastry in spiritual tradition
Spiritually, Synastry asks what relationship reveals, heals, mirrors, or matures.
Why Synastry matters
Synastry matters because real compatibility is not Sun-sign matching. It shows what each person activates in the other: affection, irritation, safety, desire, responsibility, growth, and blind spots.
Synastry at work: an example
One person's Mars on another person's Moon may bring chemistry, irritation, protection, or emotional urgency depending on the whole chart.
Sources and editorial method
This concise reference separates established definitions from historical, symbolic, or interpretive claims. Entries without external references are presented as editorial summaries rather than primary-source scholarship.
- Source
- The Great Almanac Dictionary
- Category
- Astrology
- Also appears in
- Astrology
- Aliases
- relationship astrology
- Last updated
- 2026-07-15
Compare your relationship charts
Synastry in a book is one thing; Synastry in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.
Speak with the OracleHow Synastry lives in your own chart across your year, in love, in work, in timing, is written in the Cosmic Codex: the whole year, once. Open the Cosmic Codex
Related terms
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Common questions
What is Synastry?
Synastry is relationship astrology that compares two birth charts to study attraction, friction, compatibility, timing, projection, and mutual activation.
How is Synastry used in astrology?
Use Synastry for romantic, friendship, family, business, mentorship, and client questions where two charts interact.
What should I avoid when interpreting Synastry?
Do not use Synastry to decide someone's worth or force a relationship conclusion.
