Astrological synastry: how birth chart compatibility works
Synastry overlays two natal charts to reveal what binds you, what creates tension, and the shared karma in a relationship. Find out how it works and what it reveals.
What is astrological synastry
Synastry is the astrological technique that compares two natal charts by overlaying them. When one person's planets are projected onto the other's houses and planets, patterns of attraction, tension, support, and conflict become visible. It does not determine whether a couple will work out—it reveals what dynamics will arise and how often.
How to read aspects between two natal charts
The key aspects in synastry are conjunctions (fusion of energies), trines (natural ease and support), sextiles (opportunities for cooperation), squares (productive friction), and oppositions (polar tension, attraction-repulsion). A lasting relationship is not marked by the absence of squares, but by whether both people have the tools to navigate them.
Difference between sun sign compatibility and real synastry
Popular sun-sign compatibility is a simplification that looks at only one of ten planets in each chart. Real synastry analyzes how all the planets in both charts interact, especially the Moon, Venus, Mars, and Saturn—the planets most relevant to intimate relationships.
Synastry reading for your relationship
Detailed analysis of both natal charts: what connects you, what challenges you, and the long-term pattern of your relationship.
Get a synastry readingThe North Node in synastry: relationship karma
One of the most powerful indicators in synastry is a conjunction between one person's North Node and the other's personal planets. This pattern suggests a karmic relationship: both souls recognize each other and have something to resolve or complete together. It does not mean the relationship will be easy—it means it carries weight.
What a professional synastry reading includes
A professional synastry reading first analyzes each chart separately (to understand what each person seeks in a relationship), then overlays the planets. It interprets the most significant interplanetary aspects, the houses activated by the other's planets, and identifies the overall pattern of the relationship dynamic.
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