A RETROVERSE STUDIOS PROJECT
The Clockwork of the Heavens, Charted.
An astrology chart engine with the real Swiss Ephemeris compiled to WebAssembly. Natal charts, transits, returns, synastry — computed entirely in your browser, to professional-grade precision.
Free & open source · Windows, macOS, Linux
Sun through Pluto, lunar nodes, Chiron, Lilith — retrogrades flagged, seven house systems, applying and separating aspects.
Tropical and sidereal side by side, with Lahiri, Raman, Krishnamurti and Fagan-Bradley ayanamsas. Full varga set included.
Any moment's sky against your chart. Solar and lunar returns, secondary progressions, solar arc directions, dashas.
Inter-aspects, house overlays, composite and Davison charts — and a compatibility bouquet instead of a fake percentage.
The Swiss Ephemeris compiled to WebAssembly. Professional-grade planetary positions, computed entirely client-side.
No server, no accounts, no analytics. Your birth data never leaves your machine — in the browser or on the desktop.
ASTRON is a real astronomical calculation engine attached to an old interpretive tradition. The positions are as accurate as professional software — it is the same ephemeris. Whether they mean anything about your life is a question for the tradition, not for the maths, and we keep the two clearly separated.
The maths is real and shown honestly. The meaning belongs to the tradition, not to fate.
Checking for the latest release…