Synastry, Explained: What Overlay and Composite Charts Each Answer, and Where Attraction and Friction Come From

Synastry sounds mystifying, but its logic is plain: you lay another person's natal chart over yours and watch how the two sets of planets land in each other's signs, houses and angles. It does not say how the story ends; it describes the chemistry between two people when they stand side by side. That chemistry lives in the aspects and in the question of whose planet enters which of your houses.

What overlay versus composite is for

An overlay chart places both sets of planets in one wheel and reads interaction and projection: your Sun in their seventh house, their Mars on some angle to your Venus. A composite chart takes the midpoint of each pair of planets and builds a third chart that speaks for the relationship itself — a portrait of the couple as a single unit. Think of one as listening to two people converse and the other as examining the house they are building together.

How to read the strong aspects

A conjunction (close to 0°) fuses two energies into one beam — instant familiarity and density. An opposition (~180°) is a tug-and-pull dynamic, often intense precisely because it completes a missing piece. A trine (~120°) is the smoothest, energy that slips into gear on its own; smooth, but not the same as deep. Check the orb first (contacts within roughly 5–8° generally count), then weigh the planets: Sun and Moon carry identity and security, Venus and Mars carry attraction and assertion, and Saturn charts duty and strain.

Where attraction and friction come from — and why "planet in their house" is not fate

Attraction tends to follow harmonious angles and house placements: when your Venus is lit by their Mars, desire has somewhere to land. Friction usually gathers around squares, oppositions, and planets sitting heavily on the other person's Ascendant or IC. But a planet falling into someone's house does not make you soulmates — my planet in your seventh house simply means the two of you engage frequently around partnership-type matters. The substance of a relationship still rests on each person's maturity in their own chart, the quality of the contacts, and the everyday work of being together. Walking in with a "soulmate" label tends to turn ordinary disagreements into evidence that the person was "wrong".

How to read the workbench synastry view

In synastry mode, the Workbench overlays both natal charts at exact degrees and color-codes your planets against theirs, lists the inter-chart aspect table with its orb settings, and builds the composite chart on demand. Start with the two connecting lines that matter first — Sun to Moon and Venus to Mars — then move to the house layer and see which planets fall where in each other's charts, and only then absorb the composite's overall tone.

Give yourself one small reading discipline next time you open the synastry tool: set the verdict aside, walk the aspect list line by line, and ask "which specific stretch of our time together does this angle describe?" A synastry chart is a map of relational themes, not a prophecy that writes your ending — closeness is still answered by how you show up for each other day by day.