io.github.mrfentmen/astronomy-mcp
astronomy-mcp
Is the io.github.mrfentmen/astronomy-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-29.
Solar and lunar almanac offline: sunrise, sunset, twilight, sun position and moon phase
alive probed 2026-11-15 · unchanged since 2026-10-29
- Run it
- npx -y @mrfentmen/astronomy-mcp@1.0.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- astronomy-mcp 1.0.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 696 tokens in Claude Opus 5.5, exact, measured 2026-10-29. With the Claude Code prefix mcp__…__ on each tool name: 735. The o200k_base estimate is 384. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mrfentmen/awesome-servers
- Registry
- active, updated 2026-10-28 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.81×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| solar_times | 315 | 174 | 45 % |
| sun_position | 250 | 138 | 36 % |
| moon_phase | 131 | 72 | 19 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- io.github.mrfentmen/aspectj-mcp · alive
- io.github.mrfentmen/aspnet-mcp · alive
- io.github.mrfentmen/assembly-mcp · alive
- io.github.mrfentmen/assemblyai-mcp · alive
- io.github.mrfentmen/asymptote-mcp · alive
- io.github.mrfentmen/atml-mcp · alive
- io.github.mrfentmen/ats-mcp · alive
- io.github.mrfentmen/auditd-mcp · alive
Servers that mention astronomy.
- NASA Image of the Day — space & astronomy photos (nasaiotd) com.a2awire/data-nasa-photo-space-image-astronomy · alive
- CycleCalcs Astronomy com.cyclecalcs/astronomy · alive
- Kaalshodh — Indian astronomy time machine com.kaalshodh/kaalshodh · alive
- com.tarotari.www/tarotari · alive
- World Weather Online io.github.WorldWeatherOnline/wwo-mcp · not found
- io.github.cyanheads/astronomy-mcp-server · alive
- RymdenKollen — Swedish Space & Astronomy io.github.jannegpriv/rymdenkollen · needs auth
- Sky Watch MCP net.nexlab/sky-watch · needs auth
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.