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OpenEphemeris
NASA-grade astrology data, drawn live inside Claude via MCP
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
Hey Product Hunt 👋 I'm Jackson — solo founder, and I built OpenEphemeris because every "astrology API" I tried either hallucinated planetary positions or hand-waved the math underneath them. This is a Go monolith computing sub-arcsecond positions straight from NASA's JPL DE440 kernel — the same data behind spacecraft navigation — across 120 REST endpoints. Every position is calculated, never guessed; you get clean JSON and typed errors, not prose to parse.
If you use Claude: there's a 92-tool MCP server, and the part I most want to show is that it renders real interactive charts right inside the conversation — natal wheels, bodygraphs, bi-wheels, actually drawn, not screenshots of JSON (see the GIF). Ask in plain language and Claude reaches for the real numbers instead of making them up.
Here's the honest reason this exists: a language model is extraordinary at meaning and tradition, and hopeless at coordinates — plausible is fine for prose and fatal for a planetary position, because a chart that's "close" lands in the wrong sign and inverts the whole reading. Astrology's interpretive half deserves a calculation half that is genuinely correct, so I built the deterministic layer the models were missing.
The Explorer tier is free — a one-time grant of 150 credits, no card. (Note: connecting on claude.ai needs a paid Claude plan for custom connectors; Claude Desktop and Claude Code work on any plan.) I'd genuinely love feedback — on the accuracy, the MCP setup, the endpoint surface, or what you'd want it to compute next. What would you point it at? 🔭
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About OpenEphemeris on Product Hunt
“NASA-grade astrology data, drawn live inside Claude via MCP”
OpenEphemeris was submitted on Product Hunt and earned 2 upvotes and 2 comments, placing #160 on the daily leaderboard. 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
OpenEphemeris was featured in API (98.6k followers), Developer Tools (519k followers) and Artificial Intelligence (478.1k followers) on Product Hunt. Together, these topics include over 214.2k products, making this a competitive space to launch in.
Who hunted OpenEphemeris?
OpenEphemeris was hunted by Jackson Mathey. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Jackson Mathey