{
  "scope": "Historical independent calculation, not an observed sighting, live forecast or SatellitePlus validation",
  "versions": {
    "skyfield": "1.54",
    "sgp4": "2.27",
    "numpy": "2.5.4",
    "jplephem": "2.24"
  },
  "observer": {
    "latitude_deg": 51.4769,
    "longitude_deg": -0.0005,
    "height_m": 46.0,
    "label": "Greenwich reference site"
  },
  "tle_epoch_utc": "2018-07-03T19:25:57Z",
  "tle_sha256": "156daac25f8c9ddd928ca862d7dceba59a38b8829df8992b9af33d4df93a345d",
  "ephemeris_sha256": "08b20db2ae22488650641c5a9033e5bfda4b1c4b440cfeaf20f621cfa18ecdb3",
  "window_utc": [
    "2018-07-04T00:00:00Z",
    "2018-07-05T00:00:00Z"
  ],
  "screen": {
    "minimum_elevation_deg": 10.0,
    "sun_elevation_below_deg": -6.0,
    "satellite_must_be_sunlit": true,
    "sample_step_seconds": 10
  },
  "summary": {
    "geometric_culminations_above_10_deg": 4,
    "culminations_passing_screen": 0,
    "sampled_screen_windows": 0
  },
  "events": [
    {
      "utc": "2018-07-04T04:28:55.240Z",
      "event": "rise_above_10_deg",
      "elevation_deg": 10.0,
      "azimuth_deg": 221.616,
      "range_km": 1468.617,
      "sun_elevation_deg": 4.129,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T04:31:59.451Z",
      "event": "culmination",
      "elevation_deg": 36.787,
      "azimuth_deg": 152.949,
      "range_km": 654.67,
      "sun_elevation_deg": 4.534,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T04:35:04.573Z",
      "event": "set_below_10_deg",
      "elevation_deg": 10.0,
      "azimuth_deg": 84.268,
      "range_km": 1475.587,
      "sun_elevation_deg": 4.944,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T06:05:00.875Z",
      "event": "rise_above_10_deg",
      "elevation_deg": 10.002,
      "azimuth_deg": 261.503,
      "range_km": 1473.485,
      "sun_elevation_deg": 17.798,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T06:08:19.557Z",
      "event": "culmination",
      "elevation_deg": 89.158,
      "azimuth_deg": 169.945,
      "range_km": 413.334,
      "sun_elevation_deg": 18.297,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T06:11:38.470Z",
      "event": "set_below_10_deg",
      "elevation_deg": 9.998,
      "azimuth_deg": 83.274,
      "range_km": 1475.652,
      "sun_elevation_deg": 18.799,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T07:41:32.194Z",
      "event": "rise_above_10_deg",
      "elevation_deg": 10.002,
      "azimuth_deg": 278.692,
      "range_km": 1475.832,
      "sun_elevation_deg": 32.686,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T07:44:50.689Z",
      "event": "culmination",
      "elevation_deg": 79.269,
      "azimuth_deg": 192.79,
      "range_km": 419.972,
      "sun_elevation_deg": 33.2,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T07:48:08.848Z",
      "event": "set_below_10_deg",
      "elevation_deg": 9.998,
      "azimuth_deg": 106.014,
      "range_km": 1472.204,
      "sun_elevation_deg": 33.712,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T09:18:12.453Z",
      "event": "rise_above_10_deg",
      "elevation_deg": 10.001,
      "azimuth_deg": 271.465,
      "range_km": 1474.689,
      "sun_elevation_deg": 47.176,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T09:21:04.137Z",
      "event": "culmination",
      "elevation_deg": 27.168,
      "azimuth_deg": 211.54,
      "range_km": 816.521,
      "sun_elevation_deg": 47.575,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    },
    {
      "utc": "2018-07-04T09:23:55.143Z",
      "event": "set_below_10_deg",
      "elevation_deg": 9.986,
      "azimuth_deg": 151.533,
      "range_km": 1467.73,
      "sun_elevation_deg": 47.969,
      "satellite_sunlit": true,
      "passes_screen_at_this_instant": false
    }
  ],
  "sampled_screen_windows": [],
  "limits": [
    "Screening is not a brightness prediction or a guarantee of visibility.",
    "Weather, phase angle, size, attitude, light pollution, eyesight and real obstructions are not modelled.",
    "Sampled endpoints have 10-second resolution; events can have finer numerical timing without equivalent physical accuracy.",
    "Use fresh orbital data and your real observing site for a current session."
  ]
}