Astronomy Oracle

Name: Astronomy Oracle
Author: gregario

by gregarioversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.gregario/astronomy-oracle

Install

Overview

Description from the maker (original English)

Astronomical catalog data and observing session planner. 13,000+ objects from OpenNGC.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "astronomy-oracle": {
      "command": "npx",
      "args": [
        "-y",
        "astronomy-oracle"
      ]
    }
  }
}

Run this in your terminal

claude mcp add astronomy-oracle -- npx -y astronomy-oracle

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "astronomy-oracle": {
      "command": "npx",
      "args": [
        "-y",
        "astronomy-oracle"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "astronomy-oracle": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "astronomy-oracle"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account gregario, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 18348 servers in this category
Published to the registry more recently than 3% of the other 18348 servers in this category
Basic checks equal to or better than 100% of the other 18348 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Astronomy Oracle safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, 好縮 Short

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Astronomy Oracle

Accurate astronomical catalog data and observing session planner for LLM assistants. Stops hallucinated magnitudes, coordinates, and visibility.

Features

3 tools for object lookup, catalog search, and observing session planning
13,000+ deep-sky objects from the OpenNGC catalog (NGC, IC, Messier, and addendum objects)
Deterministic astronomy math — Julian dates, sidereal time, alt/az conversion, rise/transit/set times
Zero network dependency — all data is bundled, all calculations are local

Install

Run directly with npx:

npx astronomy-oracle

Or install globally:

npm install -g astronomy-oracle

Configuration

Claude Desktop

Add to your claude_desktop_config.json:

"mcpServers": { "astronomy-oracle": { "command": "npx", "args": ["-y", "astronomy-oracle"] } } }

Claude Code

claude mcp add astronomy-oracle -- npx -y astronomy-oracle

Tool Reference

`lookup_object`

Look up a celestial object by Messier number, NGC/IC designation, or common name. Optionally compute visibility from a given location and time.

"name": "lookup_object", "arguments": { "name": "M31", "latitude": 51.5, "longitude": -0.1, "date": "2025-06-15T22:00:00Z" } }

Returns detailed object data: type, coordinates (RA/Dec), magnitude, angular size, surface brightness, Hubble type, cross-references, and (when location is provided) current altitude/azimuth with rise/transit/set times.

`search_objects`

Search and filter the catalog by type, constellation, magnitude range, angular size, or catalog membership.

"name": "search_objects", "arguments": { "type": "PN", "constellation": "Lyr", "maxMagnitude": 12.0, "limit": 10 } }

Returns a formatted table of matching objects sorted by brightness. Supports filtering by object type (Galaxy, Planetary Nebula, Open Cluster, etc.), constellation, magnitude range, minimum angular size, and catalog (Messier, Caldwell, NGC, IC).

`plan_session`

Generate an observing session plan for a given location and date. Returns the best objects to observe grouped by time window.

"name": "plan_session", "arguments": { "latitude": 40.7, "longitude": -74.0, "date": "2025-03-20", "minAltitude": 20, "maxMagnitude": 10.0, "types": ["G", "PN", "GCl"] } }

Returns objects grouped into three windows (evening, midnight, pre-dawn), scored by observability based on altitude, magnitude, and angular size.

Data Sources

Source	License	Description
OpenNGC	CC-BY-SA 4.0	NGC/IC/Messier catalog with coordinates, magnitudes, dimensions, and cross-references

The OpenNGC data is included under the Creative Commons Attribution-ShareAlike 4.0 International License. See the OpenNGC repository for full attribution.

Development

# Run tests

npm test

Build

npm run build

Run in development mode (tsx)

npm run dev

Open MCP Inspector

npm run inspect

License

MIT for code. CC-BY-SA 4.0 for OpenNGC data.

Astronomy Oracle

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

好縮 Short

README from the maker

Astronomy Oracle

Features

Install

Configuration

Claude Desktop

Claude Code

Tool Reference

lookup_object

search_objects

plan_session

Data Sources

Development

Build

Run in development mode (tsx)

Open MCP Inspector

License

`lookup_object`

`search_objects`

`plan_session`