# C236 — Global reflection gives a right-anchored dual ladder

23 September 2026 · Step 31 of 60, continuing C205.

Under the global signed reflection R(t)=−t, the fixed BC Creation origin becomes the fixed reflected right boundary, while the reflected Noah/Flood endpoints return to their BC source side. Widths are unchanged and interval centers change sign.

| p | Fixed reflected Creation center | Successive left centers |
|---|---|---|
| 3 | 4419 | [-2458, -3056, -3706] |
| 5 | 4417 | [-2460, -3058, -3708] |

The conjugate R∘Pₐ∘R is the same slope with fixed point −a. This is a dual description of the same sourced comparisons, not another independent ladder or a change in the global Mirror rule. Source projections keep their original roles.

## 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/`.