Koskamo

astronomy-mcp-server

An offline observational astronomy server that computes planet and moon positions, rise/set times, moon phases, eclipses, and seasons for any location and time. It supports STDIO or Streamable HTTP and includes tools for sky positions, twilight times, event finding, and satellite passes.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

astronomy-mcp-server logo, by cyanheadsCommunity listingLocal stdioSource reviewed; not executedPublished by cyanheads
Vendor documentation

What you can do with it

  • Get apparent positions of planets or stars
  • Calculate rise/set and twilight times
  • Find upcoming eclipses and equinoxes
  • List currently visible naked-eye bodies

Source and maintenance

Community listingRegistry 0.5.0
mcp-registry: io.github.cyanheads/astronomy-mcp-server@0.5.0Source repository
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@cyanheads/astronomy-mcp-server 0.5.0

npmnpx
@cyanheads/astronomy-mcp-server package definition
{
  "version": "0.5.0",
  "transport": "stdio",
  "identifier": "@cyanheads/astronomy-mcp-server",
  "runtimeHint": "npx",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "MCP_LOG_LEVEL",
      "format": "string",
      "default": "info",
      "description": "Sets the minimum log level for output (e.g., 'debug', 'info', 'warn')."
    },
    {
      "name": "ASTRONOMY_ENABLE_HORIZONS",
      "format": "string",
      "default": "false",
      "description": "Register the astronomy_get_ephemeris tool, which fetches small-body and spacecraft ephemerides from JPL Horizons. Off by default; the core is keyless and offline."
    },
    {
      "name": "ASTRONOMY_ENABLE_SATELLITES",
      "format": "string",
      "default": "false",
      "description": "Register the astronomy_get_satellite_passes tool, which predicts visible satellite passes from CelesTrak GP element sets propagated with SGP4. Off by default."
    },
    {
      "name": "ASTRONOMY_DEFAULT_TIMEZONE",
      "format": "string",
      "description": "Fallback IANA timezone for observer-local output when a tool call omits `timezone`. Unset means UTC-only output."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "astronomy-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/astronomy-mcp-server@0.5.0"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "ASTRONOMY_ENABLE_HORIZONS": "<YOUR_ASTRONOMY_ENABLE_HORIZONS>",
        "ASTRONOMY_ENABLE_SATELLITES": "<YOUR_ASTRONOMY_ENABLE_SATELLITES>",
        "ASTRONOMY_DEFAULT_TIMEZONE": "<YOUR_ASTRONOMY_DEFAULT_TIMEZONE>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "astronomy-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/astronomy-mcp-server@0.5.0"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "ASTRONOMY_ENABLE_HORIZONS": "<YOUR_ASTRONOMY_ENABLE_HORIZONS>",
        "ASTRONOMY_ENABLE_SATELLITES": "<YOUR_ASTRONOMY_ENABLE_SATELLITES>",
        "ASTRONOMY_DEFAULT_TIMEZONE": "<YOUR_ASTRONOMY_DEFAULT_TIMEZONE>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "astronomy-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/astronomy-mcp-server@0.5.0"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "ASTRONOMY_ENABLE_HORIZONS": "<YOUR_ASTRONOMY_ENABLE_HORIZONS>",
        "ASTRONOMY_ENABLE_SATELLITES": "<YOUR_ASTRONOMY_ENABLE_SATELLITES>",
        "ASTRONOMY_DEFAULT_TIMEZONE": "<YOUR_ASTRONOMY_DEFAULT_TIMEZONE>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "astronomy-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/astronomy-mcp-server@0.5.0"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "ASTRONOMY_ENABLE_HORIZONS": "<YOUR_ASTRONOMY_ENABLE_HORIZONS>",
        "ASTRONOMY_ENABLE_SATELLITES": "<YOUR_ASTRONOMY_ENABLE_SATELLITES>",
        "ASTRONOMY_DEFAULT_TIMEZONE": "<YOUR_ASTRONOMY_DEFAULT_TIMEZONE>"
      }
    }
  }
}

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