C210 — Expansion of the two halves around the named death
23 September 2026 · Step 5 of 60, continuing C205.
The first source midpoint splits the 598 interval into 299+299. Expansion gives 325+325 across the second, 650 interval. The midpoint itself advances by 624=(598+650)/2.
| Sourced midpoint | Generated image | Old half | New half | Advance |
|---|---|---|---|---|
| 2757 | 3381 | 299 | 325 | 624 |
| 2759 | 3383 | 299 | 325 | 624 |
This separates three quantities that can otherwise be conflated: movement of an endpoint, movement of a midpoint, and width of a half-interval. The 624 advance is determined by the two neighboring endpoint gains. It is not itself an additional Noah-death event interval.
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.
6 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/.