{"id": "c809", "title": "C809 — Resolve the NT head-role dependence", "filename": "C809.md", "role": "Research action", "step": 809, "sha256": "e6d5e97e4e3d1fb739eb272808e045817f8383cc1802d89764682f28d4bd7180", "bytes": 1038, "origins": ["C480–C1634/Research_Cycles/C0732_C0831/journal.json#C809"], "download": "/sources/e6d5e97e4e3d1fb739eb272808e045817f8383cc1802d89764682f28d4bd7180.md", "format": "md", "derived": true, "tags": ["Counts & NT"], "excerpt": "Would the birth-hinge head produce the same BJ duration?", "content": "# C809 — Resolve the NT head-role dependence\n\n## Question\n\nWould the birth-hinge head produce the same BJ duration?\n\n## Inputs\n\n```json\n{}\n```\n\n## Sources\n\n```json\n[\n  \"File43 Matthew birth-hinge2806 versus envelope2876\"\n]\n```\n\n## Opened utc\n\n2026-09-28T02:09:09.616674+00:00\n\n## Results\n\n```json\n{\n  \"birth_head\": 2806,\n  \"envelope_head\": 2876,\n  \"Luke_minus_birth\": 2520,\n  \"Luke_minus_envelope\": 2450,\n  \"role_effect\": 70\n}\n```\n\n## Finding\n\nUsing Matthew’s birth head gives2520; its head envelope gives2450. The interface therefore depends on an explicit source role, just as the BJ2450/2400 comparison depends on Creation/Fall roles.\n\n## Reassessment\n\nSpecify which operations explain the BJ families and which source choices remain inputs.\n\n## Checks\n\n```json\n{\n  \"birth2520\": true,\n  \"envelope2450\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T02:09:09.617506+00:00\n\n## Record provenance\n\nExact record hash: `3024e1b427420076a981e30a58b2c49a169b1500efe3af2116d9a23af259804b`\n\nSource journal: `Research_Cycles/C0732_C0831/journal.json`", "journalDownload": "/sources/8ea2b882289fbcea5cf11177923617f0c1d1ad7e6eaa3bffb174c6f89699d97d.json", "evidenceLinks": [{"id": "d-dde4eca7c1f64eae", "title": "File 43"}]}