{"id": "c768", "title": "C768 — Compare row rounding with date-grid rounding", "filename": "C768.md", "role": "Research action", "step": 768, "sha256": "f29d07f9a99805e8e65adc837dc409f62b2f4798fa7d74bd111a3bb4fcc3c1e4", "bytes": 1269, "origins": ["C480–C1634/Research_Cycles/C0732_C0831/journal.json#C768"], "download": "/sources/f29d07f9a99805e8e65adc837dc409f62b2f4798fa7d74bd111a3bb4fcc3c1e4.md", "format": "md", "derived": true, "tags": ["Rounded"], "excerpt": "Can rounding already calculated dates reproduce the source chronology?", "content": "# C768 — Compare row rounding with date-grid rounding\n\n## Question\n\nCan rounding already calculated dates reproduce the source chronology?\n\n## Inputs\n\n```json\n{\n  \"grid_anchor\": 1406\n}\n```\n\n## Sources\n\n```json\n[\n  \"File51a §16.2; C754–757\"\n]\n```\n\n## Opened utc\n\n2026-09-28T01:58:17.376412+00:00\n\n## Results\n\n```json\n{\n  \"diagnostic\": {\n    \"path\": \"model/date_grid_diagnostic.json\",\n    \"sha256\": \"ac040f2ee4e2718dc6af24e48a39d46edbff3525e3a215e0f5ab2e1a1b8bd876\",\n    \"bytes\": 2216\n  },\n  \"mismatch_counts\": {\n    \"MT_native_OFF\": 11,\n    \"LXX_native_ON\": 7,\n    \"SP_native_OFF\": 17\n  },\n  \"MT_examples\": {\n    \"Noah\": {\n      \"grid\": 6381,\n      \"row\": 6386\n    },\n    \"Abraham\": {\n      \"grid\": 2436,\n      \"row\": 2431\n    }\n  }\n}\n```\n\n## Finding\n\nA nearest1/6 date-grid projection fails at11 of26 MT boundaries. Rounded chronology depends on the source path, not just the final Actual date.\n\n## Reassessment\n\nTest subdivision dependence over an informative complete source subpath.\n\n## Checks\n\n```json\n{\n  \"counts\": true,\n  \"Noah\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T01:58:17.376999+00:00\n\n## Record provenance\n\nExact record hash: `cac6e7b1574e63f5dd512752e6bc3c640cbee44356a8c157d9de97aa79ed803a`\n\nSource journal: `Research_Cycles/C0732_C0831/journal.json`", "journalDownload": "/sources/8ea2b882289fbcea5cf11177923617f0c1d1ad7e6eaa3bffb174c6f89699d97d.json", "evidenceLinks": [{"id": "d-ac040f2ee4e2718d", "title": "model/date_grid_diagnostic.json"}, {"id": "d-d8aa38afb2a2df8f", "title": "File 51a"}]}