Astronomy API
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.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Astronomy API the way a machine reads it — 28 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Astronomy API scores 39.3/100 (developing), with a separate agent-readiness read of 26/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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title="Astronomy API on API Evangelist — API profile and Kin Score">
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Astronomy API
Each block below is one kind of artifact we hold for Astronomy API. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 6
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
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)
Astronomy API v3
Version 3 of the Astronomy API, published by the provider as a reference draft with a complete OpenAPI 3.1 definition before it ships — "so that the design can be read and argue...
Open Collections 6
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONAstronomy Bodies API
OPEN COLLECTIONAstronomy Bodies Events API
OPEN COLLECTIONAstronomy Bodies Search API
OPEN COLLECTIONAstronomy Bodies Studio API
OPEN COLLECTIONAstronomy API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Astronomy Api Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Astronomy Api Finops
FINOPSFeatures 5
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Celestial Body Positions
Retrieve real-time and historical positions of celestial bodies including planets, moons, and other astronomical objects for any geographic location and date/time.
Astronomical Events
Access data on celestial events such as eclipses, conjunctions, and other notable astronomical occurrences for a given body and date range.
Star Chart Generation
Generate customizable star charts as images for any sky position, date, and observer location for use in applications and publications.
Moon Phase Imagery
Generate moon phase images showing the illumination and appearance of the moon for any given date and location.
Deep Space Object Search
Search for stars and deep space objects by name or catalog designation to retrieve positional and descriptive data.
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 3
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
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.
Integrations 2
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Mobile Astronomy Apps
Mobile applications integrate the Astronomy API to provide real-time sky data and star chart overlays for stargazing experiences.
Planetarium Software
Planetarium and sky simulation software integrates celestial body position data from the Astronomy API for accurate sky rendering.
Resources
Every other property we hold for Astronomy API — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/astronomy-api · machine-readable index on apis.io
This is an independent, third-party profile of Astronomy API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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