490d Unified Chronology Knowledge Catalog

The 490d Unified Chronology Knowledge Catalog is the public entry point for the revised, public-clean repository.

Its purpose is preservation. The repository records approximately 40 years of biblical-numerics, chronology, calendar, and comparative-source research in AI-readable canonical Markdown.

The current public-clean Markdown files are the canonical source layer. WordPress pages, HTML pages, PDFs, DOCX files, JSON, JSONL, RAG records, and Knowledge Graph records are derived publication or extraction layers.

Canonical raw Markdown source

The raw Markdown source index is here:

https://490d.com/source/490d-unified-chronology

That index links to:

  • the 65 public-clean repository files;
  • the current control documents;
  • the publication manifest;
  • the non-controlling historical archive.

Main catalog pages

Current control documents

The active reading controls for the repository are:

These control documents define repository style, modal-state vocabulary, Machine Guards, arithmetic conventions, cross-file dependency boundaries, and state-safe retrieval rules.

Publication manifest

The current publication manifest is linked from the Raw Markdown Source Index and from the Publication Manifest page.

The manifest records file IDs, filenames, planned WordPress slugs, raw Markdown URLs, publication status, archive pointers, and source-location metadata.

Historical archive

The Repository Change Archive is a non-controlling historical archive. It preserves revision history, pressure-test records, cleanup history, pointer-refresh history, and routed amendment material.

It is not the active control layer.

Archival copies

The corpus is externally archived for posterity, secured against the loss of this website. Independent archives hold successive preservation copies of the repository. The July 20, 2026 Internet Archive deposit is the current July 2026 edition of record through File_60; earlier deposits remain preserved as historical snapshots.

Reading rule

When interpreting the repository, use the current public-clean Markdown files together with the current Style Guide, Restart Capsule, Project Procedures, and State Vocabulary Register.

Do not treat older legacy pages, archived revision history, or prior raw-source forms as current controls unless a current file explicitly opens that source-history state.