{
  "note": "架空入力の再現計算。実観測結果ではありません。小数は表示に合わせて丸めています。",
  "source": {
    "catalog": "src/stars.js",
    "calculation": "src/astro.js",
    "hyg_version": "v4.1",
    "hyg_license": "CC BY-SA 4.0"
  },
  "input": {
    "local_datetime": "2026-08-12T21:00",
    "utc_offset_minutes": 540,
    "latitude_deg": 35.6812,
    "longitude_deg_east_positive": 139.7671,
    "direction": "all"
  },
  "expected_output": {
    "utc": "2026-08-12T12:00:00.000Z",
    "catalog_star_count": 58,
    "stars_at_or_above_geometric_horizon": 29,
    "direction_counts": {
      "all": 29,
      "north": 16,
      "east": 14,
      "south": 9,
      "west": 10
    },
    "brightest_three": [
      {"name": "アークトゥルス", "altitude_deg": 29.6, "azimuth_deg": 273.3},
      {"name": "ベガ", "altitude_deg": 86.7, "azimuth_deg": 339.6},
      {"name": "アルタイル", "altitude_deg": 59.0, "azimuth_deg": 145.9}
    ]
  },
  "comparison_wrong_offset": {
    "input_utc_offset_minutes": 0,
    "utc": "2026-08-12T21:00:00.000Z",
    "stars_at_or_above_geometric_horizon": 37,
    "vega_altitude_deg": -5.5
  }
}