{
  "date": "1892-05-14",
  "coordinate_assumption": {
    "latitude": 41.34,
    "longitude": -71.91,
    "source": "User brief; approximate town location, not an easel position"
  },
  "method": "NOAA Solar Calculator / Meeus, Python transcription; no atmospheric refraction in reported altitude",
  "method_urls": [
    "https://gml.noaa.gov/grad/solcalc/main.js",
    "https://gml.noaa.gov/grad/solcalc/calcdetails.html"
  ],
  "local_mean_time_ahead_of_EST_minutes": 12.360000000000014,
  "clocks": {
    "Eastern Standard Time": {
      "offset_from_UT_minutes": -300,
      "at_0500": {
        "altitude_deg": 4.458702283112956,
        "azimuth_deg": 68.79399435109188,
        "utc": "1892-05-14T10:00:00+00:00"
      },
      "civil_dawn": "03:57:47",
      "sunrise": "04:29:13",
      "minutes_after_sunrise_at_0500": 30.776955542304677,
      "map_0800_EST_on_this_clock": "08:00:00",
      "map_delay_minutes": 180
    },
    "Stonington local mean time": {
      "offset_from_UT_minutes": -287.64,
      "at_0500": {
        "altitude_deg": 2.30938805130258,
        "azimuth_deg": 66.80603554942009,
        "utc": "1892-05-14T09:47:38.400000+00:00"
      },
      "civil_dawn": "04:10:09",
      "sunrise": "04:41:34",
      "minutes_after_sunrise_at_0500": 18.416955542304663,
      "map_0800_EST_on_this_clock": "08:12:21",
      "map_delay_minutes": 192.36
    }
  },
  "block_island_distance": {
    "km": 34.56804917638472,
    "station_coordinate_proxy": [
      41.1667,
      -71.5667
    ],
    "station_id": "USW00014799",
    "source_url": "https://www.ncei.noaa.gov/pub/data/ghcn/daily/ghcnd-stations.txt",
    "method": "Great-circle haversine, mean Earth radius 6371.0088 km; later station coordinates used only as an island-location proxy, not the verified 1892 instrument position."
  }
}