Offline observational astronomy — planet and moon positions, rise/set, phases, eclipses, and seasons for any place and time via MCP. STDIO or Streamable HTTP.
Latest release v0.4.2 — v0.4.2: Two-body conjunctions, paged caps, rise/set and Horizons fixes · 15 Oct 2026
2 files for Codex, OpenCode and Claude Code: astronomy-mcp-server AGENTS.md, astronomy-mcp-server CLAUDE.md — 17,020 tokens loaded in every session.
AGENTS.md A 8,510 tok CLAUDE.md A 8,510 tok These files are cyanheads/astronomy-mcp-server's own configuration — they tell Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.