# C66 — The 299 midpoint expands to 325+325 without inheriting its event name

22 September 2026 · Step 4 of the authorized ten-step Mirror continuation (C63–C72).

The phase-preserving 25/23 map carries the midpoint of the MT Flood–MT Noah comparison to the midpoint between MT Noah and SP primary Noah:

\[
299=13\times23\longmapsto325=13\times25,
\qquad7176\longmapsto7800.
\]

| Branch | Original SP companion death centre | Expanded middle pair | MT Noah→middle→SP Noah |
| --- | --- | --- | --- |
| N02 | 2757 | AD 3381t/3382n | 325 + 325 |
| N04 | 2759 | AD 3383t/3384n | 325 + 325 |

N02's image is centred at 3381; N04's at 3383. The midpoint relation holds separately for Tishri and Nisan, and both new formal pairs remain half a year wide. Thus preserving the midpoint shape and seasonal phase is automatic under the declared affine action.

The named event does not transfer automatically. The retained SP Noah-death field is 2755–2760 when primary/companion stations and the three Gears are included. Neither image belongs to that field. The original midpoint is a sourced SP companion death; the expanded midpoint is a derived comparison coordinate between two sourced births. No new historical event at 3381/3383 is established here, and no all-repository search is claimed.

This separates the useful algebra from source admission. The endpoints MT Noah and SP Noah survive this expansion with their existing identities; the middle point preserves the 1:1 division but loses the original event label. An exact phase-preserving map therefore need not preserve every typed source node.

**Validation.** 10 exact arithmetic/structural checks passed. The 14 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 and Appendix A (paired Mirror and exact phase); File_18 §§2.1.3, 2.4, 3.1 and 3.2 (regular source bindings and seasonal limits); frozen C15/C16/C22/C43/C50/C61/C62 certificates (retained graph and phase); C01/C04/C05 reports (completed expansions and their source limits). The declared phase model does not infer an unstated birthday or event month from an annual source row.

**Best next bounded step — High sufficient.** Compare the fixed-Creation expansion with the existing apparent-anchor map joining the 12-fold and 13-fold constructions.