Relationships9 min readUpdated 2026-06-06

Synastry Charts: How to Read Relationship Astrology

What is a synastry chart and how do you read one? The complete guide to relationship astrology.

Synastry is the astrology of relationships. It compares two complete natal charts to reveal intricate dynamics between two people.

In a synastry chart, an astrologer examines how one person's planets interact with the other's.

The most significant synastry aspects involve personal planets connecting with each other.

House overlays add another dimension. When someone's Sun falls in your 7th house, they naturally feel like a partner.

Not all challenging aspects are bad. Saturn contacts can provide stability and commitment.

The North Node in synastry reveals karmic connections.

Composite charts represent the relationship as its own entity.

The most fulfilling relationships typically show a mix of harmonious and challenging aspects.

Align's synastry feature analyzes over 35 key aspects between two charts.

Frequently Asked Questions

What is a synastry chart?

A synastry chart compares two natal charts to reveal how two people's planetary energies interact.

What is the difference between synastry and a composite chart?

Synastry shows how two individuals affect each other. A composite chart represents the relationship itself.

What are the most important synastry aspects?

Sun-Moon, Venus-Mars, and Moon-Moon contacts are the most telling.

Can synastry predict if a relationship will work?

Synastry reveals dynamics and potentials, not outcomes.

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