C257 — N04 and the P6 double-11 interval share a center with different endpoints

23 September 2026 · Step 52 of 60, continuing C205.

N04’s original interval −4417→2460 and P6’s new interval −4416→2459 are concentric at −1957/2. The latter moves each endpoint inward by one year, shortening 6877 to 6875.

Both left endpoints are native SP Creation members; the right endpoints are MT G3 Flood start and close. This is a comparison of distinct source selections, not a new Creation Gear or use of the conditional full-week compression. Sharing an interval center does not make the intervals identical. It also does not restore P6’s absent 2461 endpoint for its own 6877 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.

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/.