{
  "id": "utsurobune-1803",
  "title": "Utsurobune: an unusual vessel in Edo-period retellings",
  "country": "Japan",
  "category": "ovni",
  "date": "1803-02-22",
  "date_label": "Date attributed in some retellings; calendar conventions and versions require comparison",
  "location": "Ibaraki coast — former Hitachi province",
  "lat": 36.2,
  "lng": 140.57,
  "summary": "Edo-period texts describe a strange hollow vessel and an unfamiliar woman. The surviving narrative tradition is documented, while a literal extraordinary craft is not established.",
  "sources": [
    {
      "id": "UB1",
      "title": "Research interview — the nineteenth-century utsurobune legend",
      "url": "https://www.nippon.com/en/japan-topics/g00879/",
      "language": "en",
      "note": "Interview with the researcher; source-text references are finding leads rather than independent sightings.",
      "kind": "Source record · see provenance note"
    }
  ],
  "author": "Eklipsis",
  "content_languages": [
    "en"
  ],
  "path": "/investigations/utsurobune-1803",
  "source_url": "https://www.nippon.com/en/japan-topics/g00879/",
  "location_source_url": "https://www.openstreetmap.org/?mlat=36.2&mlon=140.57#map=8/36.2/140.57",
  "location_precision": "region",
  "location_note": "Approximate orientation marker for the named place or institution; not a surveyed observation point, protected excavation coordinate or recommended access route.",
  "reviewed_on": "2026-09-30",
  "edition": 1,
  "truth_type": "unknown",
  "verdict": "The strongest evidence here concerns transmission of a story about an unusual vessel. A castaway episode, symbolic narrative or literary adaptation must be examined through provenance. The dossier does not present a drawn object as an authenticated technological artefact.",
  "sections": [
    {
      "title": "Documented account",
      "text": "A research interview with Tanaka Kazuo discusses several Edo-period records of the utsurobune story, including Ume no chiri and collections of castaway narratives. These texts and illustrations are real historical objects. Their resemblance to a modern UFO image is a comparison made by later readers, not evidence that the original authors measured an extraterrestrial vehicle.",
      "refs": [
        "UB1"
      ]
    },
    {
      "title": "Evidence and its limits",
      "text": "The location is a broad coastal orientation because versions and proposed places differ. The map date reproduces an attributed narrative date, not a verified arrival log. Copies and illustrations may depend on one tradition rather than separate observations.",
      "refs": []
    },
    {
      "title": "Inspector’s assessment",
      "text": "The strongest evidence here concerns transmission of a story about an unusual vessel. A castaway episode, symbolic narrative or literary adaptation must be examined through provenance. The dossier does not present a drawn object as an authenticated technological artefact.",
      "refs": []
    },
    {
      "title": "A reproducible next investigation",
      "text": "List the manuscript or printed witnesses with date, repository and spelling of the place. Compare vessel shape, inscriptions, woman and box motif across versions. Reconstruct dependencies before counting the number of supposedly independent accounts.",
      "refs": []
    }
  ],
  "timeline": [
    {
      "date": "1803, attributed narrative date",
      "text": "Some accounts assign the coastal episode to this year.",
      "refs": [
        "UB1"
      ]
    },
    {
      "date": "Edo-period records",
      "text": "The story circulates in texts and illustrations.",
      "refs": [
        "UB1"
      ]
    },
    {
      "date": "Modern manuscript research",
      "text": "Tanaka compares surviving versions and their provenance.",
      "refs": [
        "UB1"
      ]
    },
    {
      "date": "30 September 2026",
      "text": "Eklipsis prepares this source-linked documentary synthesis. This is editorial review, not historical fieldwork.",
      "refs": []
    }
  ],
  "claims": [
    {
      "text": "Edo-period texts describe a strange hollow vessel and an unfamiliar woman. The surviving narrative tradition is documented, while a literal extraordinary craft is not established.",
      "status": "Documented subject; interpretations qualified in the dossier",
      "refs": [
        "UB1"
      ]
    },
    {
      "text": "The strongest evidence here concerns transmission of a story about an unusual vessel. A castaway episode, symbolic narrative or literary adaptation must be examined through provenance. The dossier does not present a drawn object as an authenticated technological artefact.",
      "status": "Assessment with explicit limits",
      "refs": [
        "UB1"
      ]
    },
    {
      "text": "The map point represents the exact location of every reported event.",
      "status": "Incorrect; orientation only",
      "refs": []
    }
  ],
  "hypotheses": [
    {
      "title": "Castaway story adapted through retelling",
      "status": "Historical candidate",
      "support": "The narrative belongs to collections concerned with unusual arrivals.",
      "limits": "A particular real voyage is not established here.",
      "test": "Compare independent maritime records with the earliest versions."
    },
    {
      "title": "Literary or symbolic narrative",
      "status": "Candidate interpretation",
      "support": "Repeated motifs may be transmitted between texts.",
      "limits": "A shared motif does not prove that every element is invented.",
      "test": "Trace textual dependencies and identify later additions."
    }
  ],
  "tasks": [
    {
      "title": "Audit the source record",
      "body": "Retrieve the named records for Utsurobune: an unusual vessel in Edo-period retellings. Record author, edition, page or section and access date. Treat a catalogue, mirror or translation of one document as the same evidence, not independent corroboration."
    },
    {
      "title": "Build the dated evidence ledger",
      "body": "List the manuscript or printed witnesses with date, repository and spelling of the place. Compare vessel shape, inscriptions, woman and box motif across versions. Reconstruct dependencies before counting the number of supposedly independent accounts."
    },
    {
      "title": "Test the interpretation",
      "body": "Compare independent maritime records with the earliest versions. Trace textual dependencies and identify later additions. Record what would favour or weaken each explanation; leave unperformed work marked as proposed."
    }
  ]
}