C211 — Holding the cumulative left boundary instead of Creation

23 September 2026 · Step 6 of 60, continuing C205.

Replacing the fixed Creation origin by its retained cumulative boundary extends every interval by 868. Therefore every corresponding interval center moves 434 years earlier, while the gains 299 and 325 remain unchanged.

Only the final outer width is 17×529=8993. The sequence 7745→8343→8993 does not have the common ratio 25/23, because its fixed 868 prefix is added after the 13-fold widths are formed. These are intervals with a different held anchor, not another complete 17-fold expansion chain.

Evidence and scope

K=529 and r=25/23. BC base B means (B+1)t/Bn BC; reflected AD base A means AD At/(A+1)n. Their civil span is B+A in both seasonal components, with no year zero. Signed paired centers are −B and +A; the center model uses components ±1/4 and restores this separation after dilation. An interval center is geometry, not an event or a proposed universal Mirror axis.

Regular Gears are restricted to Noah/Shem/Flood. Creation and Conquest retain fixed source-field members; no fourth Gear is admitted. Generated coordinates, source-field membership and stored graph incidence are distinct. File_18/File_09 and the frozen C127 graph are unchanged. Earlier N01/N03 qualifications, the missing Shem join, closed primers and unestablished original Reports 11–25 remain unchanged. This packet selectively uses prior evidence; it does not rerun completed campaigns. Assertions and alternative placements are not independent historical witness counts.

4 step-specific checks and 19 frozen-input checks passed. Exact inputs, results and predecessor hashes are in the accompanying JSON records; calculation code is in the evidence archive. Source dependencies are identified in the body and frozen in sources/.