{"id": "c257", "title": "C257 — N04 and the P6 double-11 interval share a center with different endpoints", "filename": "490d_C257_529_Mirror_Bounded_Step_20260923.md", "role": "Research action", "step": 257, "sha256": "47d6efff86e0a5e206df4aa208307771bc5f69a70119f87aab0e52506460f22e", "bytes": 1936, "origins": ["C01–C479/reference/490d_C01_C265_Complete_Window_Archive_20260923.zip!/workspace/mirror_C206_C265_529_Expansion_Centers_20260923/C257/490d_C257_529_Mirror_Bounded_Step_20260923.md"], "download": "/sources/47d6efff86e0a5e206df4aa208307771bc5f69a70119f87aab0e52506460f22e.md", "format": "md", "derived": false, "tags": ["Regular", "Mirror / 529"], "excerpt": "C257 — N04 and the P6 double-11 interval share a center with different endpoints\n\n23 September 2026 · Step 52 of 60, continuing C205.\n\nN04’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.\n\nBoth left end", "content": "# C257 — N04 and the P6 double-11 interval share a center with different endpoints\n\n23 September 2026 · Step 52 of 60, continuing C205.\n\nN04’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.\n\nBoth 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.\n\n## Evidence and scope\n\nK=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.\n\nRegular 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.\n\n**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/`.\n", "evidenceLinks": [{"id": "d-68301ab760bfbe2e", "title": "File 18"}, {"id": "d-45851004c5864229", "title": "File 09"}]}