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OpenEphemeris
$22/moStarting price
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About OpenEphemeris
OpenEphemeris offers a REST API and MCP server delivering sub-arcsecond ephemeris data derived from NASA JPL DE440 calculations. The service covers planetary positions, aspects, and full chart structures from 1550 to 2650 CE with precision down to ±0.001 arcseconds. It supports multiple astrological traditions including Western, Vedic, BaZi, Human Design, and Hellenistic techniques through 120+ endpoints. The API provides natal charts, transits, synastry, astrocartography, eclipses, and interpretive mathematical structures in clean JSON format. Developers can integrate it via REST calls or embed it directly into AI agents like Claude or ChatGPT without requiring system prompts or extensive setup. The service includes typed errors, OpenAPI specification, and SVG chart rendering. It is designed for applications in astrology software, compatibility engines, locational astrology platforms, and AI-driven astrological analysis.
Key features
- NASA JPL DE440 ephemeris calculations
- 120+ REST endpoints for natal, transit, synastry, and other chart types
- MCP server integration for AI agents
- SVG chart rendering via API
- Support for 5 astrological traditions and 7 house systems
- Token-efficient responses for LLM optimization
- OpenAPI specification and typed errors
- 90 celestial bodies including planets, asteroids, and fixed stars
Use cases
- Building AI astrology agents with real astronomical data
- Developing astrology applications for birth charts and compatibility analysis
- Creating Human Design or BaZi chart generators
Pros
- Sub-arcsecond precision based on NASA JPL DE440 ephemeris data
- Supports 120+ REST endpoints covering multiple astrological traditions
- Integrates with AI agents via MCP server without additional code
- Provides token-efficient responses optimized for LLM usage
- Includes SVG chart rendering and multiple house systems
Cons
- No free tier beyond initial 150 trial credits
- Limited to ephemeris calculations with no additional astrological interpretation
- Requires credits for usage beyond trial period
- Coverage limited to 1550–2650 CE for core data
Frequently asked questions about OpenEphemeris
What is OpenEphemeris and what does it provide?
OpenEphemeris is a REST API and MCP server that delivers sub-arcsecond ephemeris data derived from NASA JPL DE440 calculations. It provides planetary positions, aspects, and full chart structures for astrological analysis across multiple traditions.
Who is OpenEphemeris designed for?
The service is designed for developers building astrology software, compatibility engines, locational astrology platforms, and AI-driven astrological analysis tools. It also suits AI agents like Claude or ChatGPT for seamless integration.
How does OpenEphemeris ensure accuracy in its data?
OpenEphemeris uses NASA JPL DE440 ephemeris calculations to provide sub-arcsecond precision (±0.001 arcseconds) for planetary positions and chart structures, ensuring real astronomy data rather than guesses.
What astrological traditions does OpenEphemeris support?
The API supports Western, Vedic, BaZi, Human Design, and Hellenistic astrological techniques through over 120 endpoints, including natal charts, transits, synastry, and astrocartography.
Can OpenEphemeris be used without coding knowledge?
Yes, OpenEphemeris can be integrated directly into AI agents like Claude or ChatGPT without requiring system prompts or extensive setup, allowing users to generate charts and data through natural language queries.
What pricing models does OpenEphemeris offer?
OpenEphemeris provides a free tier with 150 credits, a pay-as-you-go model with one-time credit purchases, and a subscription-based Pro tier with monthly credits and overage options for higher-volume usage.
