{
  "_meta": {
    "name": "canonical-halo-atlas",
    "description": "Canonical Sundog Workbench pose using the Halo Atlas geometry model. Each visible halo / arc is the upper portion of its own real circle. Parhelion offset binds to sun altitude (parhelion = R_22/cos h). CZA is a true full ring. Supralateral arc is a separate primitive tangent to the 46° halo top. Calibrated against Troels Nielsen DR — sun altitude 25° matches the photo's measured parhelion offset.",
    "schemaVersion": "1.0",
    "spec": "docs/SUNDOG_GENERATOR_SPEC.md",
    "model": "halo_atlas",
    "calibration": {
      "reference": "troelsnielsensolarphenonomena.jpg",
      "anchor_22_halo_radius_px": 145,
      "anchor_sun_px": [400, 356],
      "implied_sun_altitude_deg": 25,
      "overlay_evidence": "docs/calibration/overlays/p0.overlay.png",
      "phase2_default_lock": "2026-05-12"
    }
  },

  "geometryModel": "halo_atlas",

  "sunAltitudeDeg": 25,

  "halo22Intensity": 0.95,
  "halo46Intensity": 0.45,

  "czaIntensity": 0.95,
  "czaCurvature": 0.85,

  "parhelicCircleIntensity": 0.55,
  "parhelicCurvature": 0.05,
  "parhelicYOffsetR22": -0.05,

  "parheliaIntensity": 1.0,
  "parheliaDaggerLength": 1.0,

  "sunPillarIntensity": 0.80,
  "sunPillarLength": 0.55,

  "compassRayLength": 0.85,
  "compassRotationDeg": 22.5,

  "dispersionWidth": 0.70,
  "rainbowSaturation": 0.85,

  "secondarySunsStrength": 0.0,
  "ringOverlapBias": 0.5,

  "supralateralIntensity": 0.40,
  "upperTangentIntensity": 0.0,
  "lowerTangentIntensity": 0.0,
  "suncaveParryIntensity": 0.0,
  "parrySupralateralIntensity": 0.0,
  "infralateralIntensity": 0.0,

  "idleScintillationAmplitude": 0.0
}