# C803 — Build a common refinement of the two290-year paths

## Question

Can the biological and sacrifice/death subdivisions coexist without identifying their inner nodes?

## Inputs

```json
{}
```

## Sources

```json
[
  "File20 §8.1,§8.6 and biological blueprint"
]
```

## Opened utc

2026-09-28T02:07:55.191619+00:00

## Results

```json
{
  "refinement": {
    "path": "model/BJ_290_refinement.json",
    "sha256": "b0091eecfa6741ce954d931508d8c208b1d78c842071976055f1b51b213ab190",
    "bytes": 423
  },
  "gaps": [
    100,
    15,
    45,
    15,
    115
  ]
}
```

## Finding

One six-node refinement retains both partitions of290. The shared outer duration does not require Isaac birth to equal sacrifice or Jacob birth to equal Abraham death.

## Reassessment

Recover both source partitions by explicit coarsening.

## Checks

```json
{
  "gaps": true,
  "sum290": true
}
```

## Closed utc

2026-09-28T02:07:55.191978+00:00

## Record provenance

Exact record hash: `7fd7ed68f1e4786b2f28d2a3e468d902ca6b721367f954b80a57062da97b8bba`

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