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@cyanheads/astronomy-mcp-server

What's in the sky, computed offline — planet and moon positions, rise/set, phases, eclipses, and seasons for any place and time via MCP. STDIO or Streamable HTTP.\n

7 Tools • 1 Resource • 1 Prompt

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\n\n[![Version](https://img.shields.io/badge/Version-0.2.9-blue.svg?style=flat-square)](./CHANGELOG.md) [![License](https://img.shields.io/badge/License-Apache%202.0-orange.svg?style=flat-square)](./LICENSE) [![Docker](https://img.shields.io/badge/Docker-ghcr.io-2496ED?style=flat-square&logo=docker&logoColor=white)](https://github.com/users/cyanheads/packages/container/package/astronomy-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-^2.0.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![npm](https://img.shields.io/npm/v/@cyanheads/astronomy-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/astronomy-mcp-server) [![TypeScript](https://img.shields.io/badge/TypeScript-^7.0.2-3178C6.svg?style=flat-square)](https://www.typescriptlang.org/) [![Bun](https://img.shields.io/badge/Bun-v1.3.0-blueviolet.svg?style=flat-square)](https://bun.sh/)\n\n

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\n\n[![Install in Claude Desktop](https://img.shields.io/badge/Install_in-Claude_Desktop-D97757?style=for-the-badge&logo=anthropic&logoColor=white)](https://github.com/cyanheads/astronomy-mcp-server/releases/latest/download/astronomy-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=astronomy-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvYXN0cm9ub215LW1jcC1zZXJ2ZXIiXX0=) [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install_Server-0098FF?style=for-the-badge&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode:mcp/install?%7B%22name%22%3A%22astronomy-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fastronomy-mcp-server%22%5D%7D)\n\n[![Framework](https://img.shields.io/badge/Built%20on-@cyanheads/mcp--ts--core-67E8F9?style=flat-square)](https://www.npmjs.com/package/@cyanheads/mcp-ts-core)\n\n

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\n\n**Public Hosted Server:** [https://astronomy.caseyjhand.com/mcp](https://astronomy.caseyjhand.com/mcp)\n\n

\n\n---\n\n## Tools\n\nSeven tools — five form the keyless, offline, deterministic core (always registered); two are network-backed extensions that register only when their config gate is enabled.\n\n| Tool | Description |\n|:---|:---|\n| `astronomy_get_sky_position` | Apparent position of one body or named star for an observer and instant — equatorial (RA/Dec), horizontal (alt/az), ecliptic, plus distance, magnitude, angular diameter, phase, and constellation. |\n| `astronomy_get_rise_set` | Rise, set, and culmination times for a body at a location, with maximum altitude at transit. For the Sun, also the three twilight pairs (civil/nautical/astronomical). |\n| `astronomy_get_moon_phase` | Moon phase for an instant: illuminated fraction, phase name, synodic age, phase angle, and the next four quarter phases with timestamps. |\n| `astronomy_find_events` | Forward search for the next occurrences of one sky-event class: eclipses, equinoxes, solstices, moon quarters, oppositions, conjunctions, greatest elongations, and apsides. |\n| `astronomy_list_visible` | The one-call \"what's up right now\" answer: every naked-eye body (and optional bright stars) above the horizon, ranked, annotated, and gated by the Sun's altitude into daylight/twilight/dark. |\n| `astronomy_get_ephemeris` | *(gated extension)* Time-series ephemeris for a small body (asteroid/comet) or spacecraft via JPL Horizons — covers what the in-process major-body set cannot. Off by default. |\n| `astronomy_get_satellite_passes` | *(gated extension)* Visible passes of a satellite (by NORAD catalog number, or by a name resolved against the catalog) over an observer, from a CelesTrak GP element set propagated with SGP4 in-process. Off by default. |\n\nThis server computes geometry — where a body is, when an event happens — not astrophysics. The core wraps [`astronomy-engine`](https://github.com/cosinekitty/astronomy) (sub-arcminute accuracy, ≈1900–2100), so given the same `(body, time, observer)` every core tool returns identical output with no network, no rate limit, and no API key. It does not geocode: resolve a place name to latitude/longitude upstream (e.g. via an OpenStreetMap server) and pass an IANA `timezone` to receive observer-local times alongside UTC.\n\n### `astronomy_get_sky_position`\n\nApparent topocentric position of one solar-system body or a named bright star.\n\n- Equatorial (RA/Dec), refraction-corrected horizontal (altitude/azimuth), and ecliptic coordinates in one call\n- Distance, apparent magnitude, angular diameter, phase angle, illuminated fraction, and the constellation the body falls in\n- Parallax- and aberration-corrected for the observer; default elevation 0 m, default time now\n- Supply `star` (e.g. `\"Sirius\"`, `\"Polaris\"`) instead of `body` to target a catalog star; `star` takes precedence over `body`\n- `null` magnitude / angular diameter / phase fields where the engine cannot compute them — never fabricated\n\n---\n\n### `astronomy_get_rise_set`\n\nRise, set, and culmination times, with twilight for the Sun.\n\n- Searches forward from `start` and returns the next `count` cycles (default 1, max 31)\n- For `body: \"sun\"`, bundles the three twilight pairs (civil −6°, nautical −12°, astronomical −18°) so a single call answers \"when does the sun set and when is it truly dark\"\n- Circumpolar / never-rises situations are reported as `null` rise/set fields with an explanatory `note` rather than an error — the fact is the answer\n- Optional observer-local times when an IANA `timezone` is supplied\n\n---\n\n### `astronomy_find_events`\n\nForward search across nine event classes under one `event` enum.\n\n- `solar_eclipse`, `lunar_eclipse`, `equinox`, `solstice`, `moon_quarter`, `opposition`, `conjunction`, `max_elongation`, `perigee_apogee`\n- Solar eclipses require an observer (`latitude`/`longitude`) and report local visibility and contact times; lunar eclipses are geocentric and need no location\n- The body-relative events (`opposition`, `conjunction`, `max_elongation`, `perigee_apogee`) require a `body`, gated to the bodies each event exists for: `opposition` to the superior planets (mars through pluto), `conjunction` to any planet, `max_elongation` to mercury and venus, `perigee_apogee` to the moon, earth, or a planet\n- `perigee_apogee` on `earth` returns its perihelion and aphelion; `conjunction` on mercury or venus returns both the inferior and superior passes, labelled by `conjunction_kind`\n- Returns the next `count` occurrences (default 1, max 20)\n\n---\n\n### `astronomy_list_visible`\n\nThe workflow flagship — one call returns a ranked, condition-gated \"what's up\" list.\n\n- Iterates every naked-eye solar-system body (and, with `include_stars`, the bundled bright stars), keeps those above the horizon, and ranks them brightest-and-highest first\n- Attaches a plain-language `visibility_note` to each body, computed from real magnitude and altitude — no synthetic score\n- Returns the whole-sky condition (`daylight` / `civil_twilight` / `nautical_twilight` / `astronomical_twilight` / `dark`) and the Sun's altitude alongside the list\n- `time` is a single evaluation instant, not a window — for \"tonight\" pass a time after astronomical dusk (use `astronomy_get_rise_set` on the Sun to find it)\n- Use `min_altitude` to skip objects grazing the horizon\n\n---\n\n### `astronomy_get_ephemeris` *(gated extension)*\n\nTime-series ephemeris for a small body or spacecraft via the keyless JPL Horizons API. Registered only when `ASTRONOMY_ENABLE_HORIZONS` is set.\n\n- Covers asteroids, comets, and spacecraft the in-process major-body engine cannot see\n- The designation is passed to Horizons verbatim and must resolve to a single record:\n - **Numbered asteroid** — trailing-semicolon record lookup: `\"433;\"` (Eros), `\"1;\"` (Ceres)\n - **Periodic comet** — DES + closest-apparition flag: `\"DES=1P;CAP\"` (Halley), `\"DES=2P;CAP\"` (Encke)\n - **Spacecraft** — negative SPK-ID: `\"-48\"` (Hubble)\n - A bare name like `\"433 Eros\"` or `\"1P/Halley\"` returns no match or an ambiguous record list and is rejected. Look up designations at [ssd.jpl.nasa.gov/tools/sbdb_lookup.html](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html).\n- `start`/`stop` are ISO 8601 UTC and `stop` must be after `start`; `step` is a positive count plus a unit of `m`, `h`, `d`, `mo`, or `y` (`\"10m\"`, `\"1h\"`, `\"1d\"`)\n- Supplying observer `latitude`/`longitude` yields topocentric coordinates and adds alt/az — pass both or neither; one alone is rejected rather than silently downgraded to a geocentric query. Horizons is asked for refracted elevation on a topocentric request, so `altitude_degrees` carries the same refraction correction the offline core tools report\n- Large spans truncate inline at 200 rows. The disclosure names the instant the returned rows end at and the `start` to resume from — one step past it, because Horizons includes the start instant in its output, so resuming at the last row returned repeats it. Re-call with that `start`, or split the range into smaller adjacent spans — keep the same `step` and repeat until `truncated` is `false`, which concatenates back into the original series with no repeated sample. Widening the step discards samples the original range asked for\n\n---\n\n### `astronomy_get_satellite_passes` *(gated extension)*\n\nVisible passes of a satellite over an observer. Registered only when `ASTRONOMY_ENABLE_SATELLITES` is set.\n\n- Identify the satellite by exactly one of `norad_id` (e.g. `25544` for the ISS) or `name` — both, or neither, is rejected before any request goes out\n- Fetches the object's current GP element set from CelesTrak as OMM JSON and propagates it with SGP4 in-process. JSON rather than TLE because the legacy format cannot encode a catalog number above 99999, and CelesTrak already assigns six-digit numbers\n- `name` is matched as a case-insensitive substring of the catalog name, so it resolves only when it picks out a single object — either the sole match, or the one match carrying that name outright. A broader query is rejected with the matching objects and their catalog numbers to choose from, capped at 20 and stating the full match count. The result echoes the query that resolved it as `resolved_from_name`\n- Returns each pass's rise, peak, and set times with azimuths and the peak elevation\n- Only naked-eye-plausible passes are returned — the satellite must be sunlit at peak while the observer's sky is dark\n- Every returned pass rises inside the requested window. A pass already underway at `start` is omitted rather than reported with `start` as its `rise_utc`; move `start` earlier to see it. A pass rising exactly at `start` is kept, so feeding a reported `rise_utc` back as `start` never loses it\n- A `start` further from the element set's epoch than the horizon below is rejected as out of range on that distance alone, and an element set that will not propagate to a window inside the horizon is rejected as a reentry — so an empty `passes` list means only \"no visible passes in this window\"\n- `start` must be within about a month of the element set's epoch, which for a tracked object is hours old — so in practice within about a month of today. Past that the mean elements no longer describe the orbit, and SGP4 keeps returning positions built from them, which is why the horizon is enforced on the epoch distance rather than on whether the propagation succeeds\n- NORAD catalog numbers and catalog names are found at [celestrak.org](https://celestrak.org) or [heavens-above.com](https://heavens-above.com)\n- Searches the next `days` (default 7, max 10); optional observer-local pass times\n\n## Resources and prompts\n\n| Type | Name | Description |\n|:---|:---|:---|\n| Resource | `astronomy://body/{body}` | Static reference card for a solar-system body — canonical name, type, mean radius (km), and naked-eye visibility. `{body}` is one of `sun`, `moon`, `mercury` … `pluto`. |\n| Prompt | `astronomy_stargazing_plan` | Structures a \"plan tonight's stargazing from \\\" workflow, chaining the tools in order and naming the cross-server geocoding and weather steps. Anchors every step to the requested night in the observer timezone, and opts into the bright-star catalog. |\n\nAll resource data is also reachable via tools — `astronomy_get_sky_position` returns the same body metadata inline — so tool-only clients lose nothing. Design reference: [`docs/design.md`](https://github.com/cyanheads/astronomy-mcp-server/blob/main/docs/design.md).\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://www.npmjs.com/package/@cyanheads/mcp-ts-core):\n\n- Declarative tool, resource, and prompt definitions — single file per primitive, framework handles registration and validation\n- Unified error handling — handlers throw, framework catches, classifies, and formats\n- Pluggable auth: `none`, `jwt`, `oauth`\n- Swappable storage backends: `in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`\n- Structured logging with optional OpenTelemetry tracing\n- STDIO and Streamable HTTP transports; the keyless core is Cloudflare Workers-portable (pure JS, no native deps)\n\nAstronomy-specific:\n\n- Keyless, offline, deterministic core — `astronomy-engine` is the source of truth for positional astronomy; no network, no rate limit, no API key for the five core tools\n- Both UTC and observer-local time on every output when a `timezone` is supplied; the server never guesses a timezone from coordinates\n- Bundled bright-star catalog so `astronomy_list_visible` and `astronomy_get_sky_position` answer for named stars\n- Two gated extensions (off by default) reach beyond the major-body set — JPL Horizons small bodies and CelesTrak satellite passes — each with its own timeout/retry boundary; they degrade loudly and never silently fall back to the core\n\nAgent-friendly output:\n\n- Preserves uncertainty — magnitude, angular diameter, phase, and illumination are `null` (not 0, not omitted) when unavailable, and `format()` renders \"unavailable\" rather than inventing a value\n- Server-computed visibility notes are deterministic prose from real magnitude and altitude — no synthetic confidence scores\n- Typed error contracts with recovery hints (out-of-range time, missing observer/body, unresolved designation) so callers can correct and retry\n- `format()` is content-complete on every tool — `content[]`-only clients see the same fields as `structuredContent` clients, and the same numbers: a value reads as a rounded display figure followed by its exact counterpart in brackets, e.g. `RA 4.4116 h [4.411597993526305]`, dropped when the rounding already round-trips. `astronomy_list_visible` rounds hardest, since its per-body line is read at a glance down a list of dozens of bodies, and still carries every value's exact tail — no listed body needs a second call to recover its coordinates\n\n## Getting started\n\n### Public Hosted Instance\n\nA public instance is available at `https://astronomy.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:\n\n```json\n{\n \"mcpServers\": {\n \"astronomy-mcp-server\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://astronomy.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\n### Self-Hosted / Local\n\nAdd the following to your MCP client configuration file. The five core tools need no configuration; set `ASTRONOMY_ENABLE_HORIZONS` and/or `ASTRONOMY_ENABLE_SATELLITES` to `true` to register the gated extensions.\n\n```json\n{\n \"mcpServers\": {\n \"astronomy-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/astronomy-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"astronomy-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/astronomy-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"astronomy-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\"run\", \"-i\", \"--rm\", \"-e\", \"MCP_TRANSPORT_TYPE=stdio\", \"ghcr.io/cyanheads/astronomy-mcp-server:latest\"]\n }\n }\n}\n```\n\nFor Streamable HTTP, set the transport and start the server:\n\n```sh\nMCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.3.0](https://bun.sh/) or higher (or Node.js v24+).\n- No API key required — both the offline core and the two keyless extensions (JPL Horizons, CelesTrak) need no credentials.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/astronomy-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd astronomy-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n## Configuration\n\nAll configuration is optional and validated at startup via Zod schemas in `src/config/server-config.ts`. The core runs with no configuration at all.\n\n| Variable | Description | Default |\n|:---|:---|:---|\n| `ASTRONOMY_ENABLE_HORIZONS` | Register the `astronomy_get_ephemeris` tool (JPL Horizons). | `false` |\n| `ASTRONOMY_ENABLE_SATELLITES` | Register the `astronomy_get_satellite_passes` tool (CelesTrak + SGP4). | `false` |\n| `ASTRONOMY_HORIZONS_BASE_URL` | Override the JPL Horizons API endpoint. | `https://ssd.jpl.nasa.gov/api/horizons.api` |\n| `ASTRONOMY_CELESTRAK_BASE_URL` | Override the CelesTrak GP endpoint. | `https://celestrak.org/NORAD/elements/gp.php` |\n| `ASTRONOMY_DEFAULT_TIMEZONE` | Fallback IANA timezone when a tool call omits `timezone`. Unset = UTC-only output. | none |\n| `ASTRONOMY_REQUEST_TIMEOUT_MS` | HTTP timeout (ms) for Horizons and CelesTrak requests. | `15000` |\n| `ASTRONOMY_TLE_CACHE_TTL_MS` | In-process element-set cache TTL (ms) — respects CelesTrak's refetch guidance (~once/2h). | `7200000` |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\n| `MCP_HTTP_PORT` | Port for the HTTP server. | `3010` |\n| `MCP_AUTH_MODE` | Auth mode: `none`, `jwt`, or `oauth`. | `none` |\n| `MCP_LOG_LEVEL` | Log level (RFC 5424). | `info` |\n| `LOGS_DIR` | Directory for log files (Node.js only). | `/logs` |\n| `STORAGE_PROVIDER_TYPE` | Storage backend. | `in-memory` |\n| `OTEL_ENABLED` | Enable [OpenTelemetry instrumentation](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry). | `false` |\n\nSee [`.env.example`](https://github.com/cyanheads/astronomy-mcp-server/blob/main/.env.example) for the full list of optional overrides.\n\n## Running the server\n\n### Local development\n\n- **Build and run:**\n\n ```sh\n # One-time build\n bun run rebuild\n\n # Run the built server\n bun run start:stdio\n # or\n bun run start:http\n ```\n\n- **Run checks and tests:**\n\n ```sh\n bun run devcheck # Lint, format, typecheck, security\n bun run test # Vitest test suite\n bun run lint:mcp # Validate MCP definitions against spec\n ```\n\n### Docker\n\n```sh\ndocker build -t astronomy-mcp-server .\ndocker run --rm -e MCP_TRANSPORT_TYPE=stdio astronomy-mcp-server\n```\n\nThe Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/astronomy-mcp-server`. OpenTelemetry peer dependencies are installed by default — build with `--build-arg OTEL_ENABLED=false` to omit them.\n\n## Project structure\n\n| Directory | Purpose |\n|:---|:---|\n| `src/index.ts` | `createApp()` entry point — registers tools/resources/prompts and inits services. |\n| `src/config` | Server-specific environment variable parsing and validation with Zod. |\n| `src/mcp-server/tools` | Tool definitions (`*.tool.ts`). Five core tools plus two gated extensions. |\n| `src/mcp-server/resources` | Resource definitions (`*.resource.ts`). Body reference card. |\n| `src/mcp-server/prompts` | Prompt definitions (`*.prompt.ts`). Stargazing plan. |\n| `src/services/ephemeris` | The offline compute core — `astronomy-engine` wrapper, body-radius table, and bundled bright-star catalog. |\n| `src/services/horizons` | JPL Horizons HTTP client (gated extension). |\n| `src/services/satellite` | CelesTrak GP/OMM fetch + SGP4 propagation (gated extension). |\n| `tests/` | Unit and integration tests mirroring `src/`. |\n\n## Development guide\n\nSee [`CLAUDE.md`](https://github.com/cyanheads/astronomy-mcp-server/blob/main/CLAUDE.md) for development guidelines and architectural rules. The short version:\n\n- Handlers throw, framework catches — no `try/catch` in tool logic\n- Use `ctx.log` for request-scoped logging, `ctx.state` for tenant-scoped storage\n- Register new tools and resources in the `createApp()` arrays in `src/index.ts`\n- Normalize raw engine/API values to the domain type; preserve uncertainty as `null` and never fabricate missing fields\n\n## Contributing\n\nIssues and pull requests are welcome. Run checks and tests before submitting:\n\n```sh\nbun run devcheck\nbun run test\n```\n\n## License\n\nApache-2.0 — see [LICENSE](https://github.com/cyanheads/astronomy-mcp-server/blob/main/LICENSE) for details.\n","changelogMarkdown","videoKey","requiredSecretsJson","publishedAt","priceCents","trialDays",0,"upstream",{"_105":106,"_107":108,"_109":110,"_111":112,"_113":114,"_115":116},"requiredSecrets",[],"tags",[98,99,19,100,101,102,103,104],"assets",[],"stats",{"_96":85,"_97":85},"ratingAvg","reviewCount","astronomy","astronomy-engine","eclipse","ephemeris","moon-phase","rise-set","typescript","topics",[98,99,19,100,101,122,123,102,103,104],"license","Apache-2.0","language","TypeScript","registryName","io.github.cyanheads/astronomy-mcp-server","homepage","https://www.npmjs.com/package/@cyanheads/astronomy-mcp-server","packages",[117,118],{"_119":120,"_121":22,"_75":76},{"_119":120,"_121":22,"_75":76},"registryType","npm","identifier","mcp","model-context-protocol","ENV",{"_126":127,"_128":129,"_130":131},"ENVIRONMENT","production","TURNSTILE_SITE_KEY","0x4AAAAAAB8-rEI2gNDf_QhU","SENTRY_DSN","https://45fd1229f78089d5c3ee78be128030e1@o4510583261757440.ingest.de.sentry.io/4510584253448272"]