# openephemeris-com

**Canonical:** https://apis.io/providers/openephemeris-com/  
**Website:** https://openephemeris.com/  
**APIs profiled:** 1

Open Ephemeris provides a high‑precision ephemeris API for developers and AI agents, delivering sub‑arcsecond planetary positions, aspects, and full chart structures from NASA JPL DE440 data covering 1550‑2650 CE. The service powers astrology, human design, astro‑cartography, and compatibility engines with clean REST endpoints and MCP integration for ChatGPT and Claude, offering free trial credits and detailed documentation.

## Kin Score — 59.7 / 100 (strong)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 66.1 |
| Contract Quality | 61.1 |
| Contract Governance | 79.1 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 47.6 |
| Access Clarity | 63.7 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 28.2 (matched via fallback).

## Agent readiness — 37.5 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | unknown |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | distinct |

## APIs (20)

- **openephemeris-com ACG API** — Map the cosmos to the earth. Astrocartography (ACG), cyclocartography (CCG), and Local Space endpoints. Returns GeoJSON feature collections—perfect for drawing maps in your app....
- **openephemeris-com Agricultural API** — Work with the earth's rhythms. Biodynamic planting profiles and multi-day agricultural calendars. **1 unit per request.**
- **openephemeris-com API Metadata API** — Discover the API schema and current contract hash. **Free — not metered.**
- **openephemeris-com Calendar API** — Mark the turning of the wheel. Cross-quarter days, exact moon phases, and lunar standstills. **10 units per request.**
- **openephemeris-com Catalogs API** — Explore our extensive reference catalogs. See all supported planets, asteroids, fixed stars, and star groups available for calculation. **Free — not metered.**
- **openephemeris-com Chinese API** — Eastern insights. BaZi (Four Pillars) charts, element balance, luck pillars, ten gods analysis, compatibility, solar terms, and the Chinese zodiac. **1 unit per request** (eleme...
- **openephemeris-com Comparative API** — Explore relationships and overlays. Cast synastry, composite, and transit-to-natal charts effortlessly. **3 units per request** (flat rate; does not scale by subject count).
- **openephemeris-com Eclipse API** — Find the shadows. Calculate solar and lunar eclipses, global circumstances, next-visible searches, and Saros series data (solar eclipses only — lunar eclipse responses do not po...
- **openephemeris-com Electional API** — Find the best moment for a specific activity. Score a moment's viability, search a date range for top-ranked windows, track planetary stations, and search active aspects. **5 un...
- **openephemeris-com Ephemeris API** — Discover the foundation of any chart. Get natal positions, houses, lots, core aspects, and fixed stars. Calculated with NASA-grade precision (JPL DE440, 1550–2650 CE). **1 unit ...
- **openephemeris-com Health API** — System health and readiness checks. **Free — not metered.**
- **openephemeris-com Human Design API** — Map the energetic blueprint. Bodygraphs, composite charts, transit fields, and pentas. **2 units per request** (transit-chart and composite are 3).
- **openephemeris-com Location Timezone API** — Geocoding and timezone resolution to help you locate your charts accurately. **1 unit per request.**
- **openephemeris-com Lunar API** — Track the Moon's journey. Phases, aspects, void-of-course windows, and exact lunar ingresses. **1 unit per request.**
- **openephemeris-com Predictive API** — Look ahead (or behind). Find exact times for transits, cast solar & lunar returns, calculate progressions, and run traditional time-lord techniques (primary directions, firdaria...
- **openephemeris-com Tidal API** — Calculate tidal forces and lunar coastal influences. **1 unit per request.**
- **openephemeris-com Time Conversion API** — Convert between time formats. Julian Day numbers, sidereal time, sunrise/sunset. **1 unit per request.**
- **openephemeris-com Vedic API** — Vedic (Jyotish) calculations including Ayanamsha and the Navamsa (D-9) divisional chart. **1 unit per request.**
- **openephemeris-com Venus Cycles API** — Explore the elegant dance of Venus. Synodic cycle analysis and Star Points. **1 unit per request.**
- **openephemeris-com Visualization API** — Render chart imagery. Generate natal chart wheels, comparative bi-wheels, and Human Design bodygraphs as SVG or PNG. Free on every tier, including Explorer. **2 units per reques...

## Agentic access (1)

- **Openephemeris Com Agentic Access** — 142 operations · 86 acting

## Security (3)

- **Openephemeris Com Authentication** — apiKey/http · 4 schemes
- **Openephemeris Com Domain Security** — TLSv1.3 · HSTS · DMARC
- **Openephemeris Com Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Openephemeris Com Plans Pricing**

## Tags

Company, Astrology, AI, Astronomy, Data, API

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/openephemeris-com/). Scores are computed from the provider's own public artifacts under a published rubric.