OpenEphemeris
NASA-grade astrology data, drawn live inside Claude via MCP
OpenEphemeris launched on September 1, 2026 with 1 votes, #3,900 of 8,094 launches that month.
What it does
Finally, trustworthy astrology in chat, with accurate data and interactive charts. Give your project the solar system. For users: connect, ask Claude (or another LLM), then interact, learn, and grow. Trustworthy information where you already are. For developers: 120 REST endpoints, 92 typed MCP tools, the NASA JPL DE440 engine. Fast, accurate, sub-arcsecond ephemeris data. Build and integrate in minutes. Natal, transits, relational, Human Design, BaZi, Vedic, and more. Free access, no card
Precision ephemeris API backed by NASA JPL DE440. 121 production endpoints for natal charts, transits, astrocartography, human design, and more. Free tier (150 credits, one-time). Wallet top-ups from $5. Subscriptions from $29/mo (75,000 credits). Enterprise on request.
Sub-arcsecond planetary positions, aspects, and full chart structures — served through one clean REST API, or straight inside Claude and ChatGPT. Real astronomy, never guessed. Natal charts, transits, synastry, astrocartography, Human Design, BaZi — clean JSON in, exact positions out. Typed errors, OpenAPI spec, one key for everything. Ask Claude or ChatGPT about tonight's sky, someone's chart, or the next eclipse — and the answer comes from NASA JPL DE440, not from a guess. No code, no terminal. Charts, bodygraphs, and maps render inside the conversation — not as text. ELA Map — our own locational astrology & Human Design platform — runs entirely on these endpoints. Every line, crossing,…from openephemeris.com
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