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    "credit": "NASA EPIC Team / DSCOVR",
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        "observation_utc": "2022-06-21 21:15:22Z",
        "identifier": "20220621212011",
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    "intervalSeconds": 10,
    "crossfadeSeconds": 1.5,
    "residentTextures": 2,
    "installation": "Fixed celestial orientation, entrance direction +Z; globe sits to the right and slightly above the entrance axis, with responsive sizing that keeps its full limb inside phone viewports. Six genuine natural-color observations from the same day; a 60-second exhibition loop, not a live stream or physical orbit simulation. DSCOVR observes from about one million miles away, not from the ISS.",
    "background": "Preserve the original photographic black background. Stars are omitted in the bright-Earth view as an exposure/presentation choice, not a claim that stars cannot be seen by human observers near Earth.",
    "failureBehavior": "Keep the current frame if the next download fails; retry later. Pause the sequence clock across tab visibility changes; never blank the Earth during a transition."
  },
  "stars": {
    "file": "data/bright-stars.json",
    "credit": "David Nash / Astronexus, HYG v4.1",
    "source": "https://github.com/astronexus/HYG-Database/blob/main/hyg/CURRENT/hygdata_v41.csv",
    "sourceSha256": "d9f69fd86bbf90a4e4d52b4c5c53eacfa6dfc0bfdef85bfd94f095e0bebe4ebd",
    "license": "CC BY-SA 4.0",
    "licenseUrl": "https://creativecommons.org/licenses/by-sa/4.0/",
    "licenseFile": "assets/space/HYG-LICENSE.txt",
    "sha256": "331b52afd8eac7536f80e7eb22c43e313ff2b203bf9fe74772cd29bf24d72c4f",
    "selection": "Exclude Sun, retain visual magnitude <= 4.5; copy catalog ID, right ascension, declination and magnitude. J2000 positions, no current-date precession.",
    "rows": 925,
    "orientation": "Exit faces RA 6h, Dec 0 degrees; fixed celestial arrangement, not a claimed Earth-based local sky.",
    "appearance": "Black background with magnitude-ranked neutral pinpoints. Screen size and luminance deliberately increased for legibility, with a compressed brightness range and stable CSS-pixel size at different display densities. No twinkling, flares, colored nebulae or photographic Milky Way. This is a representative catalog view inspired by shielded nighttime observation, not a calibrated naked-eye or exact ISS view.",
    "renderingLicense": "Star subset and its rendered arrangement: CC BY-SA 4.0; application code is separate.",
    "pointDiameterCssPixels": "About 1.7–3.75 CSS px, varying with magnitude; device pixel ratio is applied once.",
    "unoccludedViewportCounts": {
      "390x844": 93,
      "430x932": 93,
      "1440x900": 160,
      "1920x1080": 164
    }
  },
  "lighting": "Exit point fill reduced 18 to 6; invitation ring emissive baseline 2.1 to 0.65; floor and labels remain readable.",
  "observationReferences": [
    {
      "url": "https://cosmicopia.gsfc.nasa.gov/qa_star.html",
      "basis": "NASA explains that stars in space look bright, clear and non-twinkling; their absence in many photos is an exposure issue. Human vision responds differently from a camera."
    },
    {
      "url": "https://www.nasa.gov/podcasts/houston-we-have-a-podcast/the-art-of-astronaut-photography/",
      "basis": "ISS astronauts describe nighttime camera exposure settings and window shrouds used to exclude cabin reflections. Night photographs are not direct measurements of naked-eye appearance."
    },
    {
      "url": "https://science.nasa.gov/earth/earth-observatory/stargazing-from-the-iss-88026/",
      "basis": "A documented short-lens ISS star photograph provides observational context. This installation does not copy a long-exposure starfield or claim the same observing position."
    }
  ]
}