{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-13T20:39:27Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 4,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T12:00:00Z",
      "ingestedAt": "2026-10-06T07:35:56+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:51:58+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q32099",
    "registryId": "vr.tr.meridian",
    "name": "meridian",
    "version": "0.2.0-wave.4",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "XCT.QLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q32099/",
  "model": {
    "registry_id": "vr.tr.meridian",
    "name": "meridian",
    "purpose": "Let an agent explain meridians, relay geodesy, history, the prime meridian and surveying uses from geodetic and historical sources, describe the named meridian types, and distinguish meridians from parallels, time zones, the celestial meridian and traditional Chinese medicine meridians.",
    "definition": "In geography, a meridian or line of longitude is half of a great circle on the Earth s surface running from the North Pole to the South Pole, connecting points of equal longitude, measured east or west from the prime meridian, internationally agreed at Greenwich in 1884 and today realised as the IERS Reference Meridian about 102 metres east of the Greenwich transit circle; surveying systems use principal meridians, such as those of the US Public Land Survey System, and meridian markers show meridian lines on the ground. The term also names the celestial meridian in astronomy and, in traditional Chinese medicine, proposed energy channels, a distinct concept.",
    "what_it_is_for": "Defining longitude and position.",
    "affordances": [
      "explain geodesy",
      "relay history of the prime meridian",
      "describe named meridian types",
      "distinguish other senses"
    ],
    "distinguishing_features": [
      "Pole to pole",
      "Longitude reference",
      "Historical conventions",
      "Several meanings"
    ],
    "appearance": "Lines running north-south on maps and globes; sometimes marked on the ground by plaques or lines.",
    "visual_identification": [
      "Line of constant longitude from pole to pole",
      "Meridian marker, prime meridian, principal meridian",
      "Parallels are lines of latitude; time zones follow political boundaries; the celestial meridian is in the sky; TCM meridians are a medical tradition concept"
    ],
    "physical_properties": [
      {
        "quantity": "International Meridian Conference",
        "typical_range": "1884",
        "unit": "year",
        "note": "Washington"
      },
      {
        "quantity": "IERS Reference Meridian offset",
        "typical_range": "about 102",
        "unit": "m",
        "note": "east of Airy transit circle"
      },
      {
        "quantity": "longitude range",
        "typical_range": "180 degrees east and west",
        "unit": "note",
        "note": ""
      }
    ],
    "families_and_kinds": [
      "prime meridian",
      "antimeridian",
      "principal survey meridians",
      "national historical prime meridians such as Paris",
      "celestial meridian"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "half of great circle",
        "why": "in registry terms"
      },
      {
        "relation": "defines",
        "target": "longitude",
        "why": ""
      },
      {
        "relation": "includes",
        "target": "prime meridian",
        "why": ""
      },
      {
        "relation": "is contrasted with",
        "target": "circle of latitude",
        "why": ""
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "International Earth Rotation and Reference Systems Service conventions",
      "WGS 84",
      "US Public Land Survey System"
    ],
    "failure_modes_and_hazards": [
      "Confusing the Greenwich line and the IERS meridian",
      "Confusing meridians and time zones",
      "Presenting TCM meridians as anatomical structures"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "State the longitude of a meridian and convert between coordinate formats.",
        "Use meridians for navigation and mapping with the stated datum."
      ],
      "must_not": [
        "Mix coordinates from different datums or prime meridians without saying so.",
        "Present the Greenwich meridian as the only prime meridian ever used.",
        "Confuse the geographic meridian with meridians in traditional medicine or astronomy.",
        "Give positions for navigation without stating their accuracy."
      ],
      "requires_human": [
        "Fixing disputed boundaries that follow a meridian."
      ]
    },
    "ethics": {
      "considerations": [
        "Navigation errors from wrong coordinates can put ships and aircraft at risk.",
        "Boundaries drawn on meridians often ignored people living there."
      ],
      "affected_parties": [
        "Navigators",
        "Map users",
        "People living on drawn boundaries"
      ]
    },
    "owners": {
      "steward": "Nobody owns it; geodetic authorities define reference systems.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q32099: meridian",
      "url": "https://www.wikidata.org/wiki/Q32099",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Meridian (geography)",
      "url": "https://en.wikipedia.org/wiki/Meridian_%28geography%29",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What a meridian is.",
        "rationale": "Definition.",
        "layers": [
          {
            "id": "definition",
            "name": "Definition",
            "description": "Definition.",
            "findings": [
              {
                "id": "definition-finding",
                "name": "Definition",
                "description": "Definition.",
                "questions": [
                  {
                    "text": "What is a meridian, and how does it differ from parallels, time zones, the celestial meridian and TCM meridians?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about geography, surveying, astronomy or traditional medicine?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "types",
            "name": "Types",
            "description": "Named types.",
            "findings": [
              {
                "id": "types-finding",
                "name": "Types",
                "description": "Types.",
                "questions": [
                  {
                    "text": "What are the prime meridian, principal meridians and meridian markers?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits the specific meridian?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "geodesy",
        "name": "Geodesy",
        "description": "Geodesy.",
        "rationale": "Science.",
        "layers": [
          {
            "id": "longitude",
            "name": "Longitude",
            "description": "Longitude.",
            "findings": [
              {
                "id": "longitude-finding",
                "name": "Longitude",
                "description": "Longitude.",
                "questions": [
                  {
                    "text": "How is longitude defined and measured?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "iers",
            "name": "IERS",
            "description": "Reference meridian.",
            "findings": [
              {
                "id": "iers-finding",
                "name": "IERS",
                "description": "IERS.",
                "questions": [
                  {
                    "text": "Why does the GPS zero meridian lie east of the Greenwich line?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "history",
        "name": "History",
        "description": "History.",
        "rationale": "Sources.",
        "layers": [
          {
            "id": "conference",
            "name": "Conference",
            "description": "1884 conference.",
            "findings": [
              {
                "id": "conference-finding",
                "name": "Conference",
                "description": "Conference.",
                "questions": [
                  {
                    "text": "How was Greenwich chosen in 1884, and which countries objected?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits International Meridian Conference?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "surveying",
            "name": "Surveying",
            "description": "Survey meridians.",
            "findings": [
              {
                "id": "surveying-finding",
                "name": "Surveying",
                "description": "Surveying.",
                "questions": [
                  {
                    "text": "How are principal meridians used in land surveys?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits Public Land Survey System?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "Other senses.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "astronomy",
            "name": "Astronomy",
            "description": "Celestial meridian.",
            "findings": [
              {
                "id": "astronomy-finding",
                "name": "Astronomy",
                "description": "Astronomy.",
                "questions": [
                  {
                    "text": "What is the celestial meridian and meridian transit?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits meridian (astronomy)?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "tcm",
            "name": "Traditional medicine",
            "description": "TCM meridians.",
            "findings": [
              {
                "id": "tcm-finding",
                "name": "Traditional medicine",
                "description": "Traditional medicine.",
                "questions": [
                  {
                    "text": "What are meridians in traditional Chinese medicine, and what does scientific evidence say, with positions attributed?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits meridian (Chinese medicine)?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should the principal meridian be a separate entry?",
    "How should geodetic sources be linked?",
    "Should TCM meridians be disambiguated?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}