Synastry is the branch of astrology that compares two birth charts to see how two people actually relate. By reading where your planets fall in someone else’s houses, and where theirs fall in yours, you get a working picture of the dynamic — who initiates, who steadies, who challenges, and who comforts.
Our synastry library covers every planet placed in every sign and every house. That gives you 240 readings to pull up in any combination: your Sun in their first house, their Venus in your eighth, your Mars in their Cancer, and so on. Each page shows how that specific placement tends to play out between two people — the easy gifts, the predictable friction points, and what each side is doing beneath the surface.
Start with the planets you already know best (Sun, Moon, Venus, Mars) and move toward slower-moving bodies (Saturn, Uranus, Neptune, Pluto) when you want to understand the longer arc: commitment patterns, shared growth, and the deeper transformations a relationship is built to carry.