How two charts
speak to each other
Enter two sets of birth details to see the aspects between your charts — where you flow, where you spark, and where you grow.
What is synastry?
Synastry is the astrology of relationship. It compares two natal charts to see how each person's planets touch the other's — the conversation between two skies.
Harmonious aspects (trines and sextiles) tend to feel easy and supportive; conjunctions fuse and intensify; squares and oppositions create the friction and magnetism that make a bond dynamic. No single aspect makes or breaks a connection.
Treat the resonance score as a playful summary, not a verdict. Real relationships are built, not predicted — the chart only shows the raw material.
Browse pairings by sign
Plain-language compatibility guides for sun-sign pairs — how each match clicks, where it grates, and what makes it last.
♈︎ Aries
♉︎ Taurus
♊︎ Gemini
♍︎ Virgo
♐︎ Sagittarius
♑︎ Capricorn
♓︎ Pisces
Questions
How does a synastry compatibility reading work?
Synastry lays two birth charts side by side to map how one person's planets interact with the other's. Instead of reducing each of you to a sun sign, it reads the full conversation between two skies — Moon to Moon, Venus to Mars, and every aspect in between.
Do we need exact birth times for a compatibility reading?
Exact times give the most complete picture because they unlock the Ascendant and houses. If a birth time is unknown, Coeluna still compares planet-to-planet aspects — sign placements and most aspects don't depend on the clock, so the reading stays meaningful.
Which zodiac signs are most compatible with mine?
Signs sharing an element — fire, earth, air or water — tend to click most easily, and friendly elements like fire with air or earth with water often balance each other well. But sun-sign matching is only the first layer: two charts can work beautifully even when the sun signs clash.
Is sun-sign compatibility enough to judge a relationship?
No — the Sun is one placement among many. The Moon shapes emotional needs, Venus how you love, Mars how you act on it. Synastry weighs all of these together, which is why two people with 'incompatible' sun signs can still score a strong resonance.