# C1440 — Reconstruct SP residual at component level

## Question

What causes the accepted SP cumulative head to fall190 years later than its regular head?

## Sources

```json
[
  "Comparative Study §7"
]
```

## Opened utc

2026-09-29T01:13:03.457296+00:00

## Results

```json
{
  "source_mode_gap": 8990,
  "reversed_component_differences": [
    -5770,
    5580
  ],
  "head_gap": -190,
  "gain_regular": 7200,
  "gain_cumulative": -1980
}
```

## Finding

SP cumulative/regular mode changes−5770 and+5580 leave−190, under the same accepted Fall convention in both modes.

## Reassessment

Explain why these changes lie in different decimal registers before testing new partitions.

## Checks

```json
{
  "residual_minus190": true
}
```

## Closed utc

2026-09-29T01:13:03.457505+00:00

## Record provenance

Exact record hash: `17cb6d26ca472ad5120e83d9c04946f0269e6bd8c5dae4f07de59b69491538f9`

Source journal: `Research_Cycles/C1433_C1482/journal.json`