# 490d Mirror checkpoint after C279

24 September 2026. Latest completed: **C279 — The598 triangle joins8395 to17K.**

For j2–7: B_j=−5890+j, A_(j−2)=−5292+j, R_j=3103+j. Widths B→A598, A→R8395, B→R8993. All six documented bilateral8395 endpoints match C271 source identities and phases. Missing regular Noah indices0/1 do not block these triangles because their intermediate is cumulative Flood.

## 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 AD3746/2300 superseded.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 The superseded AD1905–1911 lookup remains unexecuted.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 8 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

C280: transport the entire triangle to the documented cumulative LXX ON / regular MT ON+60 realization and verify all source-state qualifications.

Reason for selecting it after C279: The bilateral table supplies a second8395 realization with opposite BC-numeral460 shifts; testing the whole triangle can establish whether17K and598 survive together.

High is sufficient unless a later dependency requires reassessment. The next step was not executed as part of C279. The authorized batch continues through C310.