# C799 — Reconstruct the biological and surface BJ paths

## Question

How do all four shared narrative nodes differ?

## Inputs

```json
{}
```

## Sources

```json
[
  "File20 §§7A2.1–5; File53 §13A"
]
```

## Opened utc

2026-09-28T02:07:00.835821+00:00

## Results

```json
{
  "spines": {
    "path": "model/BJ_spine_residuals.json",
    "sha256": "3afb0e8a2b482a76fb4206b73d2cd79fce958a881f4827dfd7a4e428b985d385",
    "bytes": 409
  },
  "offsets": [
    0,
    11,
    10,
    5
  ],
  "reconstructed_BC": [
    1981,
    1881,
    1821,
    1691
  ],
  "surface_BC": [
    1981,
    1870,
    1811,
    1686
  ]
}
```

## Finding

The whole supplied path differs by0|11|10|5 AM years. A single translation or scale cannot explain it; local interval changes are required.

## Reassessment

Recover those changes by finite differences and retain the source tension.

## Checks

```json
{
  "ordinal_conversion": true,
  "offsets": true
}
```

## Closed utc

2026-09-28T02:07:00.836700+00:00

## Record provenance

Exact record hash: `33a5649d5d910ba17e104c14bb25c430a309caf7bb828f74c0a9d150142e86a4`

Source journal: `Research_Cycles/C0732_C0831/journal.json`