Swiss Ephemeris astrology calculations delivered as JSON: natal charts, planetary positions (sky), transits, synastry and solar returns. The API returns numeric chart data only (no written interpretations), and the sky endpoint works without a key.
Build precise astrology tools like a birth-chart generator, a planet-tracking dashboard, or a compatibility (synastry) checker using accurate astronomical numbers. You get raw chart data (positions, houses, aspects) rather than written readings, so you can craft your own interpretations or visualizations. Try the sky endpoint first — it even works without a key — then sign up for a free key to test chart endpoints. Upgrade to API Pro when you need many daily calculations or advanced endpoints.
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