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  "attachment": "earth-geographic-ocean",
  "label": "Illustrated Arctic Ocean fallout",
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  "referenceMonth": "2026-09",
  "displayDate": "September 2026",
  "source": {
    "title": "NSIDC Sea Ice Index, Version 4 (G02135)",
    "url": "https://nsidc.org/data/g02135/versions/4",
    "doi": "https://doi.org/10.7265/a98x-0f50",
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    "maskManifestSHA256": "43dbf1c9b3faade5fe8d3cc8d7b2aac6a9d3b2d0a48b2125d2374d13fbf36faa",
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    "longitudeStep": 0.25,
    "latitudeStep": 0.25,
    "definition": "Nodes in the actual northern monthly extent mask, representing at least 15% sea-ice concentration; not 100% ice coverage.",
    "poleHoleConvention": "The NSIDC Arctic extent product includes assumed ice above 15% concentration in the unobserved satellite pole hole; source geometry is preserved."
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  "selection": {
    "method": "Deterministic farthest-point sampling in unit-sphere chord distance from actual northern-mask grid nodes; begin at the canonical North Pole node, then maximise the minimum distance to selected points.",
    "minimumLatitude": 70,
    "candidateCount": 59873,
    "poleDuplicates": "One source longitude0 node at90N; eastern antimeridian duplicate excluded.",
    "minimumSelectedSeparationDegrees": 1.9789537465784093,
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    "maximumTerrainHeightMetres": -25,
    "eligibility": "The controller searches a bounded late window and samples future PaleoDEM terrain without mutating the live globe. Only water below -25m after the authored basin-open comparison gate is eligible. Failed targets remain undelivered.",
    "settled": "Recheck current water eligibility; geographic targets follow global Earth pose only, with no regional plate rotation.",
    "floatingSurfaceRadius": 100.22,
    "radiusMeaning": "Sea-level globe radius100 plus a rendering offset, not ice thickness or bathymetric depth.",
    "scheduleMeaning": "These eligibility gates and flight schedules are authored display conventions, not reconstructed basin dates, physical trajectories, freezing laws or deposition predictions."
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  "bookReferences": [
    {
      "title": "Chapter Two · The Impact Scenario",
      "href": "./chapters/chapter-2.html#the-impact-scenario",
      "sourceLines": [
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        196
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      "supports": "The book describes outer-mantle shedding and global frozen fallout before coherent-core contact; it does not calculate an Arctic delivery route."
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      "title": "Appendix A · 3. The Arctic Ocean (Pages28–29)",
      "sourceFile": "source-data/book/vision-edition.md",
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        980
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      "supports": "The Arctic discussion describes Greenland moving north carrying its ice pack. This is distinct from a floating-ocean sea-ice origin claim."
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    {
      "title": "Chapter Three · Estimating the Antarctic Comet",
      "href": "./chapters/chapter-3.html#estimating-the-antarctic-comet",
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