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Moment Sky

MCP server by rohnelt

Calculate bright star and naked-eye planet positions for a UTC time and coordinates, 2000 to 2050, and get a free sample PDF.

No sign-in (No account or key needed)Streamable HTTP

Connect to Moment Sky

No sign-in needed. Connect with Moment Sky’s own URL:

https://momentsky.rohnelt.dev/mcp

Paste it into any client that supports remote MCP servers. Your client talks to rohnelt directly, not through mcp.tc.

Share this server

Opens this page, with the URL and setup steps.

mcp.tc/i/moment-sky

About

Moment Sky calculates where bright stars and naked-eye planets appear in the sky for a given UTC time and latitude/longitude, for dates between 2000 and 2050. It also returns a free sample printable star map PDF. The website sells printable maps, but the MCP tools do not require payment.

It runs as a hosted streamable HTTP endpoint. No sign-in or API key is needed. Coordinates and UTC are processed for the request without application storage, so personal identifiers should not be sent.

What you can do

  • Calculate bright star positions for a UTC time and coordinates
  • Calculate naked-eye planet positions for dates from 2000 to 2050
  • Get a free sample printable PDF star map
  • Read-only tools with no stored user data

Tools 2

  • calculate_skyRead-only

    Calculate bright stars and naked-eye planets for a UTC time and coordinates, 2000 to 2050.

  • get_free_previewRead-only

    Return a free sample printable PDF and links to browser customization.

Read from the live server on 6 Nov 2026. Read-only, Writes and Can delete are hints the server declares; your client decides whether to ask before running a tool.

Example prompts

  • What planets are visible from Rome on 2026-12-24 at 22:00 UTC?

  • Calculate the sky at latitude 40.7, longitude -74.0 for 2030-06-21 03:00 UTC.

  • Get the free Moment Sky preview PDF.

  • Which bright stars were above the horizon in Tokyo at midnight UTC on 2010-01-01?

Set up

Every client connects to momentsky.rohnelt.dev. Pick yours; the page remembers your choice.

Claude Code

  1. Run this in a terminal, in your project folder:
claude mcp add --transport http moment-sky https://momentsky.rohnelt.dev/mcp
  1. Start Claude Code and type /mcp. moment-sky should show as connected.

Add --scope user to make it available in every project, not just this one.

Claude Desktop

  1. Open Customize → Connectors, click + Add, then Add custom connector.
  2. Name it Moment Sky and paste this URL:
https://momentsky.rohnelt.dev/mcp
  1. Click Add. Its tools appear in the chat’s tools menu.

Claude Desktop’s JSON config file only starts local servers. Remote servers go through Connectors, and connectors you add on claude.ai show up here too.

claude.ai

  1. Open the connector form on claude.ai. This button fills in the name and URL for you:
  1. Check that the URL reads https://momentsky.rohnelt.dev/mcp and click Add.
  2. Turn it on in a chat from the tools menu.

Free plans allow one custom connector. On Team and Enterprise plans an owner adds it under Organization settings → Connectors.

ChatGPT

  1. On chatgpt.com, go to Plugins, select +, then Add custom MCP server.
  2. Enter a name for the server.
  3. Under Connection, paste https://momentsky.rohnelt.dev/mcp as the server URL, then for authentication choose No authentication.
  4. Check I understand and want to continue, then select Create as a plugin.

Whether you can add a custom MCP server depends on your ChatGPT plan and your workspace permissions (in Business workspaces, admins and owners can).

Cursor

Or add it by hand to ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (this project):

mcp.json
{
  "mcpServers": {
    "moment-sky": {
      "url": "https://momentsky.rohnelt.dev/mcp"
    }
  }
}

VS Code

Or from a terminal:

code --add-mcp '{"name":"moment-sky","type":"http","url":"https://momentsky.rohnelt.dev/mcp"}'

Or commit it to the repo in .vscode/mcp.json:

.vscode/mcp.json
{
  "servers": {
    "moment-sky": {
      "type": "http",
      "url": "https://momentsky.rohnelt.dev/mcp"
    }
  }
}

Devin Desktop

  1. Add it to ~/.config/devin/mcp_config.json (macOS and Linux) or %APPDATA%\devin\mcp_config.json (Windows):
mcp_config.json
{
  "mcpServers": {
    "moment-sky": {
      "serverUrl": "https://momentsky.rohnelt.dev/mcp"
    }
  }
}
  1. Refresh the MCP server list in Cascade.

Devin Desktop is the new name for Windsurf. It reads serverUrl (or url) for remote servers.

Codex

codex mcp add moment-sky --url https://momentsky.rohnelt.dev/mcp

Or edit ~/.codex/config.toml directly:

config.toml
[mcp_servers.moment-sky]
url = "https://momentsky.rohnelt.dev/mcp"

Gemini CLI

gemini mcp add --transport http moment-sky https://momentsky.rohnelt.dev/mcp

This adds it to the current project. Add -s user to use it everywhere.

Any client

Most clients accept this shape. Some name the URL field differently: serverUrl in Devin Desktop, httpUrl in Gemini CLI’s settings file.

{
  "mcpServers": {
    "moment-sky": {
      "type": "http",
      "url": "https://momentsky.rohnelt.dev/mcp"
    }
  }
}

Zed puts servers under context_servers in its settings. Cline needs "type": "streamableHttp", or it assumes SSE.

Client only starts local servers? Bridge it with npx -y mcp-remote https://momentsky.rohnelt.dev/mcp.

Embed

Show Moment Sky in a README or on your site. Each embed links to this page, uses the server’s own URL, and sets no cookies. How embeds work

The card, the iframe and the JSON are in English. Add ?lang=it, fr, de or es to their address for another language.

README badge

Badge preview, lightBadge preview, dark
Markdown
[![Moment Sky on mcp.tc](https://mcp.tc/i/moment-sky/badge.svg)](https://mcp.tc/i/moment-sky)
HTML
<a href="https://mcp.tc/i/moment-sky"><img src="https://mcp.tc/i/moment-sky/badge.svg" alt="Moment Sky on mcp.tc" height="20"></a>

It follows the reader’s light or dark mode. Add ?theme=light or ?theme=dark to fix it, or ?style=compact to show the mark without the word.

Website card

HTML
<script src="https://mcp.tc/w/moment-sky.js" async></script>

The card appears where the tag is. Add data-theme="dark" or data-size="compact" to the tag to change it. The file holds everything it needs, so it makes no other requests and sets no cookies.

iframe

HTML
<iframe src="https://mcp.tc/embed/moment-sky" title="Moment Sky on mcp.tc" width="420" height="200" loading="lazy" allow="clipboard-write" style="border:0;border-radius:8px;max-width:100%"></iframe>

Use it on pages that don’t allow scripts. Add ?theme=light or ?theme=dark to the address to fix the colors.

JSON

The listing as data for your own pages and tools: name, tagline, the server’s own URL, tools and the “Add to” links. Any site can read it (CORS is open).

https://mcp.tc/i/moment-sky.json

What each field means

AI prompt

Paste this into an AI coding assistant, such as Claude Code or Cursor, and it adds the Moment Sky card to your site.

Markdown
Add the mcp.tc card for Moment Sky, an MCP server, to my website. It is one static script: no build step, no package to install, no cookies.

Put this tag where the card should appear. The card renders right before it:

```html
<script src="https://mcp.tc/w/moment-sky.js" async></script>
```

To show the card somewhere else, put this placeholder there and load the same script once, for example before `</body>`. Keep the link inside: visitors without JavaScript see it.

```html
<div data-mcptc="moment-sky"><a href="https://mcp.tc/i/moment-sky">Moment Sky on mcp.tc</a></div>
```

Options:
- `data-theme="light"` or `"dark"` on the tag or the placeholder fixes the colors. Without it, the card follows the visitor’s light or dark mode.
- `data-size="compact"` gives a smaller card without the tagline.
- The CSS variable `--mcptc-max-width` on the placeholder or a parent sets the width (default `520px`).
- `?lang=` on the script URL sets the card’s language: `en`, `it`, `fr`, `de` or `es`.

If the site has a Content Security Policy, allow `script-src https://mcp.tc` and `img-src data:` (the icon is inline).

For a README or other Markdown docs, use the badge instead:

```markdown
[![Moment Sky on mcp.tc](https://mcp.tc/i/moment-sky/badge.svg)](https://mcp.tc/i/moment-sky)
```

Reference: https://mcp.tc/embed

Change history

We read this server’s tool list every 3 hours and record what changes. Last read 7 Nov 2026, 14:41 UTC.

Follow Moment Sky and we’ll email you when something changes.

  1. , Automatic check

    Tracking started: 2 tools.

FAQ

Can I paste mcp.tc/i/moment-sky into my MCP client?

No. mcp.tc links are pages, not server addresses. Connect with https://momentsky.rohnelt.dev/mcp, so your client talks to Moment Sky directly. The quick link is for sharing: it opens this page, with setup steps for every client.

Does Moment Sky need an API key or a sign-in?

No. Moment Sky doesn’t ask for an account or key.

Is Moment Sky a remote or a local server?

Remote. rohnelt hosts it at https://momentsky.rohnelt.dev/mcp, and it speaks Streamable HTTP. There’s nothing to install.

What can Moment Sky do?

It has 2 tools: calculate_sky and get_free_preview. You can calculate bright star positions for a UTC time and coordinates, calculate naked-eye planet positions for dates from 2000 to 2050 and get a free sample printable PDF star map.

Which clients can use it?

Any client that supports remote MCP servers: Claude Code, Claude Desktop, claude.ai, ChatGPT, Cursor, VS Code, Devin Desktop, Codex, Gemini CLI, Zed and others. The setup steps cover each one.

Does mcp.tc track changes to Moment Sky?

Yes. Moment Sky’s History tab shows each change we find to its tools, down to descriptions and parameters, plus new versions and edits by its owner. Follow the listing to get an email when it changes.

Who wrote this page?

mcp.tc’s robot read Moment Sky’s own metadata (its MCP handshake, tool list and public pages), and an AI model drafted the text from it. A person reviews anything the checks can’t confirm. The text can still be wrong, so if you spot a mistake, use Report this listing on this page.

mcp.tc isn’t affiliated with rohnelt. This page was built from Moment Sky’s public metadata, last checked on 6 Nov 2026, and an AI model wrote the description, so it can be wrong. Names and marks belong to their owners. Something off? Report this listing.