What is a Synastry Chart?
A synastry chart overlays two natal charts and maps every planetary interaction between them — conjunctions, trines, squares, and oppositions — showing you where you naturally connect and where tension may arise.
Unlike a generic compatibility quiz, synastry uses exact planetary positions calculated to the arc-second, giving you precise, personalized insight into any relationship.
Synastry reveals:
- romantic attraction and chemistry
- emotional compatibility and needs
- how you communicate and understand each other
- growth areas and potential friction points
How to Read a Synastry Chart Step by Step
Reading a synastry chart is about finding where your planets land in your partner’s chart — and what that means for your relationship.
Follow these steps:
- Identify the Sun-Moon connection — this shows core identity compatibility
- Check Venus and Mars aspects — these reveal attraction and sexual chemistry
- Look at Mercury contacts — these determine how well you communicate
- Find Saturn aspects — these reveal long-term commitment potential
- Examine planetary house placements — where your planets fall in their chart areas of life
Synastry Compatibility – The Most Important Aspects
Not all planetary connections carry the same weight. These four aspect types define the core of any synastry reading.
Conjunction (0°)
Planets occupy the same zodiac degree — the most powerful aspect in synastry.
Intensifies shared energy; can feel magnetic or overwhelming depending on the planets involved.
Trine (120°)
Natural flow and harmony between planets. These aspects bring ease, affection, and mutual understanding — the backbone of lasting compatibility.
Square (90°)
Tension and friction between planetary energies. Challenging but transformative — squares drive growth if both people are willing to work through them.
Opposition (180°)
Polarity between two planets. Oppositions create push-pull dynamics that can generate intense attraction or recurring conflict.
Synastry Report Example
Once you generate your synastry chart on Telosia, you can unlock an AI-powered synastry report — a full written interpretation covering every major cross-chart aspect.
The report covers: the core bond and emotional dynamics, romantic attraction and chemistry, communication compatibility, growth areas and friction points, and long-term relationship themes — all grounded in your specific planetary placements.
No generic descriptions. Every interpretation is drawn from the actual aspects between your chart and your partner’s.
Synastry vs Composite Chart
If you’ve heard of composite charts, here’s how they differ from synastry.
Start with synastry to understand compatibility. Use a composite chart to see the relationship’s independent character. Telosia supports both.
Pro Tip: Once you run a synastry chart, you can ask our AI Astrologer questions like ‘What are the main communication challenges with this person?’ to get personalized relationship advice.
Synastry chart:
compares two individual birth charts side by side — shows how your planetary energies interact with each other
Composite chart:
midpoints your two charts into a single new chart representing the relationship as its own entity