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      "nautical_end_local": "2026-12-21, 17:31:37",
      "astronomical_end_local": "2026-12-21, 18:02:57",
      "civil_minutes": 28.684,
      "nautical_minutes": 60.885,
      "astronomical_minutes": 92.212
    },
    {
      "city_id": "portland-oregon",
      "date": "2026-03-20",
      "time_zone": "America/Los_Angeles",
      "sunset_utc": "2026-03-21T02:23:51.266Z",
      "civil_end_utc": "2026-03-21T02:53:24.943Z",
      "nautical_end_utc": "2026-03-21T03:28:08.008Z",
      "astronomical_end_utc": "2026-03-21T04:03:44.767Z",
      "sunset_local": "2026-03-20, 19:23:51",
      "civil_end_local": "2026-03-20, 19:53:24",
      "nautical_end_local": "2026-03-20, 20:28:08",
      "astronomical_end_local": "2026-03-20, 21:03:44",
      "civil_minutes": 29.561,
      "nautical_minutes": 64.279,
      "astronomical_minutes": 99.892
    },
    {
      "city_id": "portland-oregon",
      "date": "2026-06-21",
      "time_zone": "America/Los_Angeles",
      "sunset_utc": "2026-06-22T04:04:23.821Z",
      "civil_end_utc": "2026-06-22T04:42:26.805Z",
      "nautical_end_utc": "2026-06-22T05:33:23.940Z",
      "astronomical_end_utc": "2026-06-22T06:42:49.413Z",
      "sunset_local": "2026-06-21, 21:04:23",
      "civil_end_local": "2026-06-21, 21:42:26",
      "nautical_end_local": "2026-06-21, 22:33:23",
      "astronomical_end_local": "2026-06-21, 23:42:49",
      "civil_minutes": 38.05,
      "nautical_minutes": 89.002,
      "astronomical_minutes": 158.427
    },
    {
      "city_id": "portland-oregon",
      "date": "2026-09-22",
      "time_zone": "America/Los_Angeles",
      "sunset_utc": "2026-09-23T02:10:30.130Z",
      "civil_end_utc": "2026-09-23T02:40:04.739Z",
      "nautical_end_utc": "2026-09-23T03:14:50.753Z",
      "astronomical_end_utc": "2026-09-23T03:50:33.005Z",
      "sunset_local": "2026-09-22, 19:10:30",
      "civil_end_local": "2026-09-22, 19:40:04",
      "nautical_end_local": "2026-09-22, 20:14:50",
      "astronomical_end_local": "2026-09-22, 20:50:33",
      "civil_minutes": 29.577,
      "nautical_minutes": 64.344,
      "astronomical_minutes": 100.048
    },
    {
      "city_id": "portland-oregon",
      "date": "2026-12-21",
      "time_zone": "America/Los_Angeles",
      "sunset_utc": "2026-12-22T00:31:03.040Z",
      "civil_end_utc": "2026-12-22T01:05:19.945Z",
      "nautical_end_utc": "2026-12-22T01:42:59.292Z",
      "astronomical_end_utc": "2026-12-22T02:19:06.086Z",
      "sunset_local": "2026-12-21, 16:31:03",
      "civil_end_local": "2026-12-21, 17:05:19",
      "nautical_end_local": "2026-12-21, 17:42:59",
      "astronomical_end_local": "2026-12-21, 18:19:06",
      "civil_minutes": 34.282,
      "nautical_minutes": 71.938,
      "astronomical_minutes": 108.051
    }
  ],
  "all": {
    "civil": {
      "minMinutes": 24.568,
      "minDate": "2026-09-27",
      "maxMinutes": 38.05,
      "maxDate": "2026-06-21"
    },
    "nautical": {
      "minMinutes": 53.125,
      "minDate": "2026-10-02",
      "maxMinutes": 89.002,
      "maxDate": "2026-06-21"
    },
    "astronomical": {
      "minMinutes": 81.743,
      "minDate": "2026-10-06",
      "maxMinutes": 158.427,
      "maxDate": "2026-06-21"
    }
  },
  "interpretation": "All durations start at sunset. Nautical and astronomical figures are cumulative, not additional stage lengths. Modelled thresholds are not measurements of sky brightness."
}