{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-11T07:52:46Z",
    "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": 1,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T17:00:00Z",
      "ingestedAt": "2026-10-05T13:18:24+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "revisions": [
      {
        "at": "2026-10-06T22:31:29+00:00",
        "engine": "codex",
        "fields": [
          "definition"
        ],
        "answering_review": "9a2cf115c1819a2d116c11d39a1bd19af104a4cd1d499635935a184314dee8fd"
      }
    ],
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:25+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q12132",
    "registryId": "vr.tr.calendar-system",
    "name": "calendar system",
    "version": "0.2.0-wave.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "INF.KNW"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q12132/",
  "model": {
    "registry_id": "vr.tr.calendar-system",
    "name": "calendar system",
    "purpose": "Let an agent handle calendar systems by type, epoch, rules, conversion and use.",
    "definition": "A system for organising days into periods such as weeks, months and years for social, religious, commercial or administrative purposes, using solar, lunar or lunisolar cycles, other cycles or purely arithmetic schemes, with examples including the Gregorian, Julian, Islamic, Hebrew, Chinese and traditional calendars.",
    "what_it_is_for": "Scheduling, recording dates and religious and civil observances.",
    "affordances": [
      "convert dates between calendars",
      "compute holidays",
      "understand leap rules",
      "read historical dates correctly"
    ],
    "distinguishing_features": [
      "Organises days into cycles",
      "Solar, lunar or lunisolar",
      "Has an epoch and leap rules",
      "Many in parallel use"
    ],
    "appearance": "Tables, almanacs and date notations.",
    "visual_identification": [
      "Calendar names and eras",
      "Month names and lengths",
      "Record-keeping forms such as winter counts"
    ],
    "physical_properties": [],
    "families_and_kinds": [
      "solar calendars such as Gregorian",
      "lunar calendars such as Islamic",
      "lunisolar calendars such as Hebrew and Chinese",
      "historical calendars such as Julian",
      "traditional record systems such as winter counts"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "chronology and conceptual system",
        "why": "category"
      },
      {
        "relation": "defines",
        "target": "leap year and month",
        "why": "units"
      },
      {
        "relation": "is represented in",
        "target": "ISO 8601",
        "why": "standard"
      },
      {
        "relation": "is used for",
        "target": "holiday computation",
        "why": "application"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "ISO 8601 (Gregorian)",
      "Unicode CLDR calendar data",
      "National laws on official calendars"
    ],
    "failure_modes_and_hazards": [
      "Conversion errors",
      "Confusing Julian and Gregorian dates",
      "Lunar calendars depending on sighting"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Convert dates between calendars, stating the rules and any uncertainty.",
        "Show religious and civil dates side by side for planning."
      ],
      "must_not": [
        "Present a converted historical date as certain when the source calendar is ambiguous.",
        "Fix the date of a religious observance that depends on an authority's sighting or decision.",
        "Treat one calendar as the only correct one or dismiss others as primitive.",
        "Silently shift dates in records when changing calendar systems."
      ],
      "requires_human": [
        "Declaring dates of religious festivals for a community.",
        "Correcting dates in legal or historical records."
      ]
    },
    "ethics": {
      "considerations": [
        "Calendars carry religious and cultural identity, not just arithmetic.",
        "Date errors can affect contracts, deadlines and observances."
      ],
      "affected_parties": [
        "Communities who keep the calendar",
        "Historians and record users",
        "People bound by dated obligations"
      ]
    },
    "owners": {
      "steward": "Nobody owns a calendar system; religious and civil authorities keep their own rules.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q12132: calendar system",
      "url": "https://www.wikidata.org/wiki/Q12132",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Calendar",
      "url": "https://en.wikipedia.org/wiki/Calendar",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "system",
        "name": "System",
        "description": "Which calendar.",
        "rationale": "Type and rules.",
        "layers": [
          {
            "id": "type",
            "name": "Type",
            "description": "Solar, lunar.",
            "findings": [
              {
                "id": "type-finding",
                "name": "Type",
                "description": "Calendar type.",
                "questions": [
                  {
                    "text": "Which calendar is used, and what kind is it?",
                    "kind": "definition"
                  },
                  {
                    "text": "What is its epoch?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "rules",
            "name": "Rules",
            "description": "Months and leaps.",
            "findings": [
              {
                "id": "rules-finding",
                "name": "Rules",
                "description": "Rules.",
                "questions": [
                  {
                    "text": "How are months and leap periods determined?",
                    "kind": "definition"
                  },
                  {
                    "text": "Are months fixed or based on sightings?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "conversion",
        "name": "Conversion",
        "description": "Between calendars.",
        "rationale": "Conversion needs care.",
        "layers": [
          {
            "id": "convert",
            "name": "Convert",
            "description": "Algorithm.",
            "findings": [
              {
                "id": "convert-finding",
                "name": "Convert",
                "description": "Conversion.",
                "questions": [
                  {
                    "text": "What is this date in another calendar?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which algorithm or authority?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "historical",
            "name": "Historical",
            "description": "Old dates.",
            "findings": [
              {
                "id": "historical-finding",
                "name": "Historical",
                "description": "Historical dates.",
                "questions": [
                  {
                    "text": "Was the date recorded in the Julian or another calendar?",
                    "kind": "boundary"
                  },
                  {
                    "text": "When did the region switch?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "observances",
        "name": "Observances",
        "description": "Holidays.",
        "rationale": "Calendars define holidays.",
        "layers": [
          {
            "id": "holidays",
            "name": "Holidays",
            "description": "Dates.",
            "findings": [
              {
                "id": "holidays-finding",
                "name": "Holidays",
                "description": "Holiday dates.",
                "questions": [
                  {
                    "text": "When does this holiday fall this year?",
                    "kind": "measurement"
                  },
                  {
                    "text": "According to which authority?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "variation",
            "name": "Variation",
            "description": "Local differences.",
            "findings": [
              {
                "id": "variation-finding",
                "name": "Variation",
                "description": "Local variation.",
                "questions": [
                  {
                    "text": "Does the date vary by region or community?",
                    "kind": "boundary"
                  },
                  {
                    "text": "Why?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "software",
        "name": "Software",
        "description": "Implementation.",
        "rationale": "Software must support calendars.",
        "layers": [
          {
            "id": "libraries",
            "name": "Libraries",
            "description": "Support.",
            "findings": [
              {
                "id": "libraries-finding",
                "name": "Libraries",
                "description": "Library support.",
                "questions": [
                  {
                    "text": "Which libraries support this calendar?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is CLDR data used?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "display",
            "name": "Display",
            "description": "Localisation.",
            "findings": [
              {
                "id": "display-finding",
                "name": "Display",
                "description": "Localisation.",
                "questions": [
                  {
                    "text": "How should dates be displayed for this locale?",
                    "kind": "action"
                  },
                  {
                    "text": "Is the calendar shown explicitly?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should each calendar be a separate entry?",
    "How should conversion algorithms be linked?",
    "How should sighting-based months be handled?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}