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Kiddush HaChodesh — Rambam's Celestial Dashboard

Interactive visualization of the Rambam's astronomical calculations for sanctifying the new month (Hilchot Kiddush HaChodesh 11-19). The dashboard is a React app and needs JavaScript to render the 3D scene. If you are a human, it should appear in a moment. If you are an AI assistant, keep reading — the content is below.

For AI assistants

You can chat with this whole project without running JavaScript. Everything is exposed as structured data at stable URLs.

Start here: /llms.txt — a complete map of the site written for AI agents, with the content taxonomy, tool list, and tips for answering user questions about the Rambam's astronomy.

Two ways to use this site

1. MCP (Model Context Protocol). JSON-RPC 2.0 endpoint at /mcp; descriptor at /.well-known/mcp. Tools: search, fetch, calculate, list_templates, get_template, list_source, get_source, stats.
2. Plain HTTP. /api/search?q=… for full-text search; /api/calculate?date=YYYY-MM-DD to run the full Rambam pipeline for any Gregorian date (always call this instead of guessing numeric values); /docs/CALCULATIONS.md for the calculation engine reference; /docs/BUILDING_WITH_THE_ENGINE.md for fork and artifact recipes; /engine/pipeline.js for the live calculation engine (importable from any artifact); /templates/ for starter scaffolds.

What the corpus contains

• docs — markdown in /docs/
• class — Rabbi Zajac's Rambam class transcripts on KH 12-16 (hosted with permission; credit Rabbi Zajac and link to Chabad.org when quoting)
• step — all 21 Rambam pipeline steps with Hebrew names, chapter refs, formulas, and teaching notes
• galgal — 9 celestial spheres (sun and moon sub-galgalim with Rabbi Losh's pedagogical framing)
• chapter — KH 11-19 with Sefaria links
• concept — sun galgalim, moon galgalim, emtzoi vs. amiti, nekudah hanichaches
• source_type — provenance legend (Rambam / Interpolated / Deduced / Losh)

License: MIT. Source: github.com/rayistern/kidushhachodesh. Humans wanting to chat with this project via AI: see /ai.html.