Synastry is the astrological comparison of two people’s birth charts to understand their relationship dynamics, chemistry and long-term potential.

Is birth chart compatibility more accurate than sun signs?

Yes. A full birth chart compares Sun, Moon, Venus, Mars and rising signs, giving a far more detailed and accurate picture than sun signs alone.

Birth Chart Compatibility & Synastry

Go beyond sun signs with a full natal chart comparison.

Birth chart compatibility — known to astrologers as synastry — is the practice of overlaying two people's complete natal charts to see how their planets interact. Where a sun-sign match gives you the headline, a synastry chart gives you the whole story.

What is a synastry chart?

A synastry chart places both partners' birth charts on top of each other and measures the angles (aspects) between their planets. Harmonious aspects like trines and sextiles show natural ease, while squares and oppositions reveal friction and growth areas.

The planets that matter most in love

Sun — your core identity and ego.
Moon — emotional needs and how you nurture.
Venus — how you love, flirt and show affection.
Mars — passion, drive and physical chemistry.
Rising (Ascendant) — first impressions and the vibe you give off.

Natal chart love compatibility vs sun signs

Two people whose sun signs clash on paper can have a beautiful relationship if their Moons and Venus signs harmonize. That's why natal chart love compatibility is so powerful — it explains the couples that "shouldn't" work but do.

How to start

You'll need each person's date, exact time and place of birth. Use our sun-sign compatibility calculator for a quick read now, and explore a full birth chart when you're ready to go deeper.