What is synastry and how does it assess relationship compatibility?

Synastry is the astrology of interaction. You overlay one chart on the other and watch the planets spark, soothe, or struggle. It's not the same as a composite chart—that's the relationship as a third entity. Synastry is the direct, person-to-person current.

Here’s the mechanic. You take Person A’s chart and put their planets into Person B’s houses. Then you check the aspects between those planets—conjunctions, trines, squares. A Venus-Mars trine? That’s effortless attraction, the kind that makes you reach for each other without thinking. Saturn on the Moon? That’s the feeling of being held accountable, or perhaps burdened, in the emotional realm. Every contact is a conversation between two parts of your psyches. The full overlay is a choreography of these conversations, showing where you naturally harmonize and where you step on each other’s toes.

A client—let’s call her Rachel—sat on my couch, frustrated. 'I love him, but I feel like I'm never enough.' I looked at the synastry. His Saturn was precisely on her Sun. I said, 'Rachel, this isn't about him criticizing you. It's about how you hear yourself through him.' She stopped, eyes wide. That Saturn contact was like having a spotlight aimed at her deepest insecurities. But here’s the thing: once she saw that pattern, she stopped blaming him. She could say, 'That’s not you; that’s my Saturn-Sun trigger.' They learned to navigate it. They’re married now, with two kids. Synastry didn’t save them—it just gave them a language for the hard parts. And sometimes, that’s enough.

Here’s the point: synastry won’t guarantee a happy ending. But it will show you the voltage and the broken wires. When you know the map, you stop asking 'Why is this so hard?' and start asking 'How do we work with this?' You go from being blindsided by patterns to navigating them consciously. That shift changes everything.