Reading guide: how the chronological families fit together

Start with 490d_Chronological_Families_Integrated_Synthesis_C931.md. Its opening and family table give the central answer: the families reuse operations on labelled source structures while changing their measurements, placement or internal subdivisions.

Use 490d_Chronological_Families_Map_C931.png for a one-page view. The SVG companion is the exact scalable version.

Three results carry most of the explanation:

1. Whole fields come from local rules. One terminal and the ordered edge differences reconstruct the22-node NT/MT comparison. File_52c's complete paired field follows decimal borrowing, core length and zero rules.
2. A shared total preserves only part of a source object. The festival orders share their total but have different internal boundaries. Equal macro bodies can occupy different source-appointed positions.
3. The operation needs a declared object and domain. Keys preserve particular grids on exact divisibility domains. A retained biography inside an expanded outer span differs from uniformly scaling that biography.

For the formulas, read 490d_Chronological_Families_Technical_Companion_C931.md. It covers ordered differences, matrix/list measurements, the NT grid, one-pass decimal evaluation, Key domains and endpoint/subdivision rules.

For provenance or reproduction, use 490d_C832_Through_C931_Evidence_20260928.zip. Its claim map connects headline results to frozen sources and action ranges. Its journal records100 sequential actions with a question, inputs, results and reassessment for each. That action count is not a count of independent discoveries.

Latest File_52c remains controlling. Second inversion remains deferred. NT generated dates are explicitly schematic; the proposed offering date and carrier multipliers remain source premises. The explanation reconstructs the corpus's arithmetic and structural dependencies; it does not establish historical or theological causation.

The best next research direction is to test another complete source family with its inputs fixed before calculation, while asking which remaining source choices have independent justification. The current result is ready to use as the shared framework for that work.