relationship astrology · two natal charts · no compatibility score
Synastry Chart Calculator for Two
Compare ten planets in two birth charts and find the closest conjunctions, sextiles, squares, trines and oppositions. This is planetary synastry—not a Sun-sign match and not an invented soulmate percentage.
Enter two birth moments
How to read a synastry result
Start with the planets
The planet pair identifies the needs or functions meeting across two charts.
Then read the aspect
An aspect describes the geometry: ease does not guarantee health, and friction does not guarantee failure.
Use the orb
The number shows distance from exact. This tool uses 6° for conjunction/opposition, 5° for square/trine and 4° for sextile.
What this free synastry chart includes
The calculator compares Sun through Pluto in both directions and gives priority to close contacts involving personal planets. It intentionally omits a single score: reducing communication, consent, safety and circumstance to a number would create false precision. Birthplace coordinates are not requested because houses and angles are outside this version; that also makes the result useful when only dates and approximate times are known.
Synastry is a symbolic relationship language, not evidence of fate, abuse, fidelity or long-term success. Real behaviour and consent outrank any chart contact.