# Astronomy API

**Canonical:** https://apis.io/providers/astronomy-api/  
**Website:** https://astronomyapi.com/  
**APIs profiled:** 5

AstronomyAPI is a web API for retrieving astronomical information including data about celestial bodies, moon phases, planet positions, star charts, and astronomical events for a given location and time. The API provides developers with access to celestial body positions, astronomical event data, star chart generation, moon phase imagery, and deep space object search capabilities for any geographic location and date/time combination.

## Kin Score — 33.0 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 33.0).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 49.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 31.0 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

## Agent readiness — 29.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (5)

- **Astronomy API** — The Astronomy API provides access to astronomical data including celestial body positions, moon phases, planet positions, star charts, astronomical events, and deep space object...
- **Astronomy API Bodies API** — Celestial body information and positions
- **Astronomy API Events API** — Astronomical events for a given location and date range
- **Astronomy API Search API** — Search for stars and deep space objects
- **Astronomy API Studio API** — Generated imagery (moon phase and star charts)

## Agentic access (1)

- **Astronomy Api Agentic Access** — 7 operations · 2 acting

## Security (2)

- **Astronomy Api Authentication** — http · 1 scheme
- **Astronomy Api Domain Security** — TLSv1.3 · HSTS

## Plans (1)

- **Astronomy Api Plans Pricing**

## Use cases (3)

- **Astronomy Education Apps** — Developers build educational astronomy applications that display real-time planet positions, star charts, and moon phases for learners and enthusiasts.
- **Observation Planning Tools** — Amateur astronomers use the API to plan observing sessions by retrieving celestial body positions and upcoming astronomical events for their location.
- **Astrology and Horoscope Applications** — Astrology apps integrate the Astronomy API for accurate planetary position data to power birth chart calculations and transit predictions.

## Tags

Astronomy, Celestial Data, Space, Moon Phases, Star Charts

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