Why teams trust the engine
Real astronomy, not approximations.
OpenEphemeris computes sub-arcsecond planetary positions straight from the NASA JPL DE440 kernel — the same data behind spacecraft navigation. Here's the proof, not the pitch.
Built on OpenEphemeris
ELA Map
ELA Map — our own locational astrology and Human Design platform — is built directly on the OpenEphemeris engine. Every line, crossing, relocated chart, and bodygraph it renders comes from the same public endpoints, which is why they stay fast, precise, and honest: we depend on them ourselves.
In their words
“I built the astrology tool I always wanted, Chinese, Vedic and Western, with Claude over a couple of nights. Working like a charm.”
Why the numbers are trustworthy
Straight from JPL
Positions come from the NASA JPL DE440 kernel via the CALCEPH and SuperNOVAS libraries — the peer-reviewed standard for solar-system geometry.
Self-validating
A built-in layer cross-checks every result against JPL Horizons and flags drift, so accuracy is monitored on every request, not assumed.
Secure & typed
RFC 7807 errors, authenticated and rate-limited requests, vulnerability scans on every build, and typed MCP tools so an AI calls real math.
Try it against your own chart.
Explorer tier is free — 150 credits to start (one-time), no card required. The fastest proof is your own.