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astronomy-mcp-server

connects

astronomy.caseyjhand.com

Offline observational astronomy: positions, rise/set, moon phases, eclipses, and seasons.

https://astronomy.caseyjhand.com/mcpNo authMCP 2025-11-25v0.4.2last checked 18 Oct 2026spoke MCP on 100% of 88 checks (30 days)initialize in 549 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http astronomy-mcp-server https://astronomy.caseyjhand.com/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://astronomy.caseyjhand.com/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://astronomy.caseyjhand.com/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "astronomy-mcp-server": {
      "url": "https://astronomy.caseyjhand.com/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "astronomy-mcp-server": {
      "type": "http",
      "url": "https://astronomy.caseyjhand.com/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 18 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Handshake succeeds; 7 tools listable

Tools

astronomy_find_eventsastronomy_get_ephemerisastronomy_get_moon_phaseastronomy_get_rise_setastronomy_get_satellite_passesastronomy_get_sky_positionastronomy_list_visible

Contract history

15 Oct 2026v0.4.21 breaking3 compatibleinstructions rewritten

Breaking: astronomy_get_ephemeris

Instructions rewritten: astronomy_find_events, astronomy_get_ephemeris, astronomy_get_rise_set, astronomy_get_satellite_passes. The description an agent follows changed; the callable contract may not have.

8 Oct 2026v0.4.1no contract changes

24 Sep 2026v0.4.02 breaking3 compatible2 cosmeticinstructions rewritten

Breaking: astronomy_get_moon_phase, astronomy_get_sky_position

Instructions rewritten: astronomy_find_events, astronomy_get_ephemeris, astronomy_get_moon_phase, astronomy_get_rise_set, astronomy_get_satellite_passes, astronomy_get_sky_position, astronomy_list_visible. The description an agent follows changed; the callable contract may not have.

19 Sep 2026v0.2.101 cosmetic

2 Sep 2026v0.2.9first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/astronomy-mcp-server/badge.svg)](https://mcpi.app/servers/astronomy-mcp-server)