C28 — 6877 is an off-centre subinterval of 8993
22 September 2026 · Step 6 of the authorized 30-step Mirror continuation (C23–C52).
The containment is exact on N01–N04:
The left flank is 2K−p=868; the right is 2K+p=1248. Their sum is 4K=2116, giving 17K−4K=13K. Their difference is 2p=380, so the centre of the 13-fold interval lies 190 years to the left of the centre of the 17-fold interval.
| Branch | 13-fold centre | 17-fold centre | Difference |
|---|---|---|---|
| N01 | -1963/2 | -1583/2 | -190 |
| N02 | -1961/2 | -1581/2 | -190 |
| N03 | -1959/2 | -1579/2 | -190 |
| N04 | -1957/2 | -1577/2 | -190 |
The centres are geometric coordinates, not independently attested event dates. The offset is the retained p=130+60 alternate-profile separation, also equal to d−κ=650−460 in the source setting. It cannot be erased by replacing both flanks with 1058.
This explains the integration of 6877 without making the interior interval artificially symmetric. The 529 calibration concerns its length; the profile offset determines its placement inside the longer Mirror interval. Full Noah expansion still exists only on N02/N04.
Validation. 12 exact arithmetic/structural checks passed. The ten frozen dependencies passed hash verification; all three generated outputs replayed byte for byte in isolation, and the original dependencies remained unchanged. This step reads completed certificates and does not execute their campaigns.
Scope and provenance. Controlling File_18 and File_09 remain unchanged. Regular Gears apply only to Noah/Shem/Flood; SP person companions only to Noah/Shem. Creation and Conquest fields remain fixed. Native LXX ON, explicitly derived OFF, independent Flood start/close, and paired suffix inversion at January AD 1 remain in force. No civil year zero, upstream Gear transport, primers, Rounded campaign, or localized −33 is introduced. These are new continuation reports, not recovered historical Reports 11–25. Evidence is conditional on the supplied project model, not a proof of literary intention or independent historical dating.
Source locators. File_09 §3.1 (paired Mirror); File_18 §§2.1.3, 3.1–3.2, 6B and 6D (qualified regular and cumulative fields); frozen C15 typed graph, C16 domain certificate, and C22 reduced scale/constraint certificates.
Best next bounded step — High sufficient. Distinguish the canonical paired reflection from reflection about a local interval centre.