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's relocation and astrocartography product is built directly on the OpenEphemeris engine — every line, crossing, and relocated chart it renders comes from these endpoints.
ELA Map's locational astrology and Human Design platform runs entirely on OpenEphemeris. The precision, the speed, the breadth of endpoints, and genuinely responsive support are what made a product this ambitious possible.
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.