Compute and interpret a chart in your browser
Everything on this page is computed here, in your browser, by the caelus engine and its embedded dataset. Nothing is sent to a server.
Search a birthplace and enter the local time; the chart’s positions, aspects, facts, and a cited public-domain reading follow, with every statement traceable to a fact the engine computed.
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The playground runs the same build that ships to npm. Its worst recorded deviation from the reference ephemeris is tabulated per body on Validation.
Compare two charts
Synastry and the composite, both computed in your browser: two births in, the inter-chart aspect grid and the midpoint chart out. Birth times are local to each place (resolved to UT with caelus-birth).
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Charts worth reading
Four charts chosen for a striking reading. Click one to load it into the builder above and read it in full.