AstrologerProfessional Astrology Software

Astrologer Synastry & Composite

Astrologer calculates synastry biwheels, cross-aspect grids, house overlays, and midpoint composite charts.

Relationship work needs more than a compatibility percentage. Astrologer overlays two charts in a biwheel, computes the full cross-aspect grid between them with orbs, shows whose planets land in whose houses, and casts a midpoint composite that reads the relationship as its own chart.

The synastry biwheel

Two charts are drawn as concentric rings so you can read contact by contact: whose Venus touches whose Mars, which angles are activated, where the hard aspects actually land. Cross-aspects are computed between every body in both charts with configurable orbs, and the grid marks which are applying and which separating. Leader lines keep the outer ring legible when placements crowd, which is the usual failure mode of biwheel rendering.

House overlays

A relationship is often clearer from house overlay than from aspect. Astrologer shows which of person A's planets fall into which of person B's houses and the reverse, with a heatmap that makes concentrations obvious at a glance — a stack of someone's planets in your seventh or twelfth tells you something an aspect list will not.

Composite charts

The midpoint composite is cast as its own chart with its own houses, angles, and aspect structure, so the relationship can be read as an entity rather than as two people compared. Progressed comparisons track how the pairing evolves: you can progress both charts to a date and re-read the synastry as it stands now rather than as it stood at meeting.

Readings grounded in the actual synastry

AI compatibility readings draw on the computed cross-aspects, overlays, and composite rather than on the two sun signs. Each person is attributed correctly — a persistent problem in relationship readings is text that loses track of whose Mars is whose — and the reading covers chemistry, communication, friction, and longevity with reference to the specific contacts that produce them.

Try it

Synastry & Composite in Astrologer — professional astrology software at astrologerapp.org.

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Frequently asked questions

Does Astrologer calculate composite charts?

Yes. Astrologer casts midpoint composite charts with their own houses, angles, and aspect grid, alongside synastry biwheels and house overlays.

Is synastry free on Astrologer?

Astrologer publishes a free synastry and compatibility tool at astrologerapp.org/free-synastry that requires no account. Saved charts and full relationship readings require a subscription.

Can Astrologer compare progressed charts for a relationship?

Yes. Astrologer supports progressed synastry, progressing both charts to a chosen date so the relationship can be read as it currently stands.

Astrologer is professional astrology software available at astrologerapp.org. Read the full overview of what Astrologer is →

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