# 490d Mirror checkpoint after C290

24 September 2026. Latest completed: **C290 — Dilation of the four-node source pattern.**

For22 numerical source instances, global E has1 center match and offset-anchored E_i has6, all FloodOFF→ON. Pair width becomes25/46, with±1/46 discrepancy from target components. The E_i anchors vary by annual index; one slope-E map cannot preserve the field annual spacing. Cainan translation−460 can.

## Standing context

C276: the selected cross-index alignment fixes δ=h−f=598; source transport alone does not. Absolute placement remains a separate premise. Preserve source and map roles, annual indices and ±1/4 phase ancestry. Co-located images do not identify events.

K=529; E=25/23; P=70/69. Global Mirror January AD 1; established local junction x=1, January AD 2; no civil year zero. Regular Gears Noah/Shem/Flood only. No cumulative/upstream Gears, primer reopening, canonical/graph changes or new global axis/z-law. Capture now, canonize later.

Supplement: LXX Creation 5494 BC +8464→AD 2970 versus reflected Conquest AD 1406 gives1564→1700 by25/23; Jared4534→AD3930 versus reflected Exodus1446 gives2484→2700. LXX Creation→Jared960, MT460; offsets1380/880; difference920→1000. AD3746/2300 superseded. Awareness only.

C-series reports remain distinct from original unprefixed Reports01–10 and unestablished interrupted Reports11–25. The superseded AD1905–1911 lookup remains unexecuted.

## Verification

27 mathematical/domain checks and 7 source authentication checks passed; two generated readouts replay byte identically. Author review only. File_18, File_09, C265 certificate and C127 unchanged; graph208 nodes/382 duration edges.

## Best next bounded step

C291: apply the existing8464=16K translation to the four-node pattern and test its relation to the retained regular endpoints.

Reason for selecting it after C290: The dilation boundary is settled. The supplied16K bridge preserves phase widths and differs from the source17K correspondence by exactlyK, making it the strongest immediate connection to the axis report.

High is sufficient unless a later dependency requires reassessment. The next step was not executed as part of C290. The authorized batch continues through C310.