CelestialMCP MCP Server

Connect CelestialMCP to Claude, Cursor or any other MCP client and it stops being a tab you switch to. CelestialMCP MCP server for celestial object positioning. The celestialmcp mcp server is what makes that connection.

What the server does

A Model Context Protocol (MCP) server designed for AI assistants like Claude. It provides tools to access astronomical data, such as celestial object positions, rise/set times, visibility, and catalog information.

CelestialMCP is built with the mcp-framework and leverages the astronomy-engine library to provide accurate astronomical calculations. It offers several tools for determining positions of celestial objects, calculating their rise and set times, and listing available objects from star and deep sky object catalogs.

• Real-time Celestial Data — Access current astronomical data for a variety of objects
• Comprehensive Object Details — Retrieve equatorial and horizontal (altitude/azimuth) coordinates, visibility status, rise/transit/set times
• Specialized Data — For relevant objects, get distance (solar system objects), phase illumination (Moon and planets), and upcoming lunar phases (Moon)
• Extensive Catalogs — Utilizes local catalogs for:
• Solar system objects (Sun, Moon, planets)
• Stars (e.g., from HYG database)

Available tools

The toolset is worth reading before you wire it up, because it tells you what the integration is really for:

• Features — The Features tool exposed by this server
• Tools — 1. getCelestialDetails: Retrieves detailed astronomical information for a specific celestial object. 2. listCelestialObjects: Lists available
• Prerequisites — The Prerequisites tool exposed by this server
• Steps — 1. Clone the repository (if you haven't already): bash git clone https://github.com/Rkm1999/CelestialMCP cd CelestialMCP

Installation

Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client.

Credentials and setup notes

• Node.js (version >=18.19.0, as specified in package.json) - npm (usually comes with Node.js)

Where it fits

This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. CelestialMCP's toolset — Features, Tools, Prerequisites and 1 more — is a fair guide to whether it matches your workflow. It is maintained by Rkm1999; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against CelestialMCP's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Worth knowing first

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• Keep per-call confirmation enabled while you learn its behaviour; it is the cheapest safeguard you have.