{
  "endpoint": "/v2/sun",
  "computed_at": "2026-08-01T00:00:00.000Z",
  "query": {
    "at": "2026-07-26T23:00:00.000Z",
    "mode": "instant",
    "resolved_from": "at",
    "is_now": false,
    "latitude": 51.4778,
    "longitude": -0.0015,
    "elevation_m": 0,
    "tz": "Europe/London",
    "utc_offset_seconds": 3600,
    "utc_offset_iso": "+01:00",
    "is_dst": true,
    "timezone_source": "parameter",
    "day_anchor": "civil",
    "time_format": "iso",
    "format": "json",
    "shape": "nested",
    "precision": 6,
    "pretty": 1,
    "verbosity": "full",
    "depressions": [
      17,
      18
    ],
    "ignored": []
  },
  "data": {
    "window": {
      "start": "2026-07-27T00:00:00.000+01:00",
      "end": "2026-07-28T00:00:00.000+01:00",
      "anchor": "civil",
      "length_minutes": 1440,
      "local_date": "2026-07-27"
    },
    "rise_set": {
      "status": "normal",
      "status_label": "Rises and sets",
      "special": null,
      "events": [
        {
          "kind": "lower_transit",
          "instant": "2026-07-27T01:06:33.985+01:00",
          "azimuth_deg": 359.999871,
          "altitude_deg": -18.760119
        },
        {
          "kind": "rise",
          "instant": "2026-07-27T05:16:24.076+01:00",
          "azimuth_deg": 56.865535,
          "altitude_deg": -0.83332
        },
        {
          "kind": "upper_transit",
          "instant": "2026-07-27T13:06:33.658+01:00",
          "azimuth_deg": 179.999987,
          "altitude_deg": 57.668914
        },
        {
          "kind": "set",
          "instant": "2026-07-27T20:55:46.285+01:00",
          "azimuth_deg": 302.865673,
          "altitude_deg": -0.833301
        }
      ],
      "rise": [
        "2026-07-27T05:16:24.076+01:00"
      ],
      "set": [
        "2026-07-27T20:55:46.285+01:00"
      ],
      "transit": [
        "2026-07-27T13:06:33.658+01:00"
      ],
      "above_horizon_minutes": 939.4
    },
    "solar_noon": "2026-07-27T13:06:33.658+01:00",
    "solar_noon_altitude_deg": 57.668914,
    "solar_noon_altitude_refracted_deg": 57.668914,
    "solar_noon_altitude_unrefracted_deg": 57.658218,
    "solar_noon_azimuth_deg": 179.999987,
    "solar_midnight": "2026-07-27T01:06:33.985+01:00",
    "solar_midnight_altitude_deg": -18.760119,
    "solar_midnight_altitude_refracted_deg": -18.760119,
    "solar_midnight_altitude_unrefracted_deg": -19.273941,
    "day_length": "15h 39m",
    "day_length_minutes": 939.4,
    "day_length_seconds": 56362,
    "day_length_change_from_yesterday_seconds": -173,
    "twilight": {
      "civil": {
        "dawn": "2026-07-27T04:34:35.829+01:00",
        "dusk": "2026-07-27T21:37:19.111+01:00",
        "altitude_deg": -6,
        "definition": "The band runs from -6 to -0.8333 degrees of unrefracted solar altitude. dawn and dusk are the instants the Sun crosses -6 deg, and the two duration fields are the time the Sun spends inside this band, not the time until sunrise or since sunset.",
        "duration_morning_minutes": 41.8,
        "duration_evening_minutes": 41.5
      },
      "nautical": {
        "dawn": "2026-07-27T03:37:13.834+01:00",
        "dusk": "2026-07-27T22:34:05.867+01:00",
        "altitude_deg": -12,
        "definition": "The band runs from -12 to -6 degrees of unrefracted solar altitude. dawn and dusk are the instants the Sun crosses -12 deg, and the two duration fields are the time the Sun spends inside this band, not the time until sunrise or since sunset.",
        "duration_morning_minutes": 57.4,
        "duration_evening_minutes": 56.8
      },
      "astronomical": {
        "dawn": "2026-07-27T02:08:20.099+01:00",
        "dusk": "2026-07-28T00:00:00.615+01:00",
        "altitude_deg": -18,
        "definition": "The band runs from -18 to -12 degrees of unrefracted solar altitude. dawn and dusk are the instants the Sun crosses -18 deg, and the two duration fields are the time the Sun spends inside this band, not the time until sunrise or since sunset.",
        "duration_morning_minutes": 88.9,
        "duration_evening_minutes": 85.9
      }
    },
    "custom": [
      {
        "depression_deg": 17,
        "dawn": "2026-07-27T02:29:19.747+01:00",
        "dusk": "2026-07-27T23:40:16.028+01:00"
      },
      {
        "depression_deg": 18,
        "dawn": "2026-07-27T02:08:20.099+01:00",
        "dusk": "2026-07-28T00:00:00.615+01:00"
      }
    ],
    "golden_hour": {
      "morning": {
        "begin": "2026-07-27T04:51:20.851+01:00",
        "end": "2026-07-27T06:06:20.750+01:00"
      },
      "evening": {
        "begin": "2026-07-27T20:06:02.115+01:00",
        "end": "2026-07-27T21:20:41.036+01:00"
      },
      "definition": "Sun centre from -4 degrees to +6 degrees."
    },
    "blue_hour": {
      "morning": {
        "begin": "2026-07-27T04:34:35.829+01:00",
        "end": "2026-07-27T04:51:20.851+01:00"
      },
      "evening": {
        "begin": "2026-07-27T21:20:41.036+01:00",
        "end": "2026-07-27T21:37:19.111+01:00"
      },
      "definition": "Sun centre from -6 degrees to -4 degrees."
    },
    "night_begins": "2026-07-28T00:00:00.615+01:00",
    "night_ends": "2026-07-28T02:13:34.005+01:00",
    "dark_minutes": 133.6,
    "position_now": {
      "instant": "2026-07-27T00:00:00.000+01:00",
      "basis": "requested_instant",
      "basis_definition": "Evaluated at the instant you asked for.",
      "azimuth_deg": 343.506415,
      "compass": "NNW",
      "altitude_refracted_deg": -17.250728,
      "altitude_unrefracted_deg": -17.775436,
      "refraction_deg": 0.524708,
      "declination_of_date_deg": 19.258682,
      "hour_angle_hours": 10.890574,
      "shadow_length_multiplier": null,
      "is_up": false
    },
    "tropical_sign": {
      "name": "Leo",
      "code": "leo",
      "sign_index": 4,
      "degree_in_sign": 3.970404,
      "degree_in_sign_whole": 3
    },
    "constellation": {
      "name": "Cancer",
      "abbreviation": "Cnc"
    },
    "summary": "The Sun rises at 05:16 and sets at 20:55 local time, giving 15 hours 39 minutes of daylight."
  },
  "warnings": [],
  "links": {
    "self": "https://www.cyclecalcs.com/v2/sun?at=2026-07-27&depressions=17%2C18&lat=51.4778&lon=-0.0015&tz=Europe%2FLondon",
    "docs": "https://www.cyclecalcs.com/api/reference.html#sun",
    "spec": "https://www.cyclecalcs.com/v2/openapi.json",
    "page": "https://www.cyclecalcs.com/sunrise-sunset-calculator.html",
    "explain": "https://www.cyclecalcs.com/learn/seasons.html"
  },
  "meta": {
    "api_version": "2",
    "contract_version": "2.0.0",
    "engine": {
      "name": "Astronomy Engine",
      "license": "MIT",
      "author": "Don Cross",
      "version": "2.1.19",
      "version_source": "upstream_sha256_match",
      "sha256": "068f1445ed0c636c94818fe6d20d7d125120e605e0bab9fc4675c3d531be5ad7",
      "vendored": true,
      "credit": "astronomy-engine (MIT, Copyright (c) 2019-2023 Don Cross)"
    },
    "tzdb": "2026b",
    "rights": "unrestricted",
    "attribution": {
      "required": false,
      "text": "Computed by CycleCalcs (cyclecalcs.com) with the MIT-licensed Astronomy Engine. Positional astronomy only.",
      "sources": []
    },
    "notice_url": "https://www.cyclecalcs.com/methodology.html#data-sources",
    "cache": {
      "class": "fixed_instant",
      "deterministic": true
    },
    "accuracy": {
      "statement": "Positions are arcminute class for the Sun, Moon and planets across 1700 to 2200, degrading toward the ends of that window.",
      "residuals_url": "https://www.cyclecalcs.com/api/accuracy.html"
    },
    "time": {
      "scale_of_input": "UTC",
      "ut1_source": "assumed equal to UTC; no IERS bulletin is loaded, so UT1 minus UTC may differ by up to 0.9 s",
      "delta_t_seconds": 75.4,
      "delta_t_model": "Espenak and Meeus"
    },
    "not_computed": [
      {
        "name": "constellation.genitive",
        "reason": "Needs the reduced constellation index; the generator has not run yet."
      }
    ],
    "horizon": {
      "sunrise_sunset_altitude_deg": -0.8333,
      "sunrise_sunset_definition": "centre of the Sun 50 arcminutes below the true horizon, being about 16 arcminutes of solar semidiameter plus about 34 arcminutes of horizon refraction",
      "civil_twilight_altitude_deg": -6,
      "nautical_twilight_altitude_deg": -12,
      "astronomical_twilight_altitude_deg": -18,
      "horizon_dip_modelled": false,
      "horizon_dip_arcmin_if_modelled": 0,
      "horizon_dip_note": "Observer elevation raises the observer on a locally flat plateau. Dip of the sea horizon is not modelled. The value you are forgoing is 1.753 times the square root of the elevation in metres, in arcminutes."
    },
    "refraction": {
      "model": "Saemundsson (Astronomy Engine normal mode)",
      "verified": true,
      "assumed_temperature_c": null,
      "assumed_pressure_mbar": null,
      "applied_below_horizon_down_to_deg": -1
    },
    "method": {
      "solar_noon": "A true upper transit from the engine hour-angle search, not the midpoint of sunrise and sunset that /v1 returns. The two can differ by tens of seconds, most where the equation of time is changing fastest.",
      "ecliptic_source": "Ecliptic(GeoVector(Sun)), used consistently across v2."
    },
    "budget": {
      "engine_calls": 58
    }
  },
  "attribution": "Computed by CycleCalcs (cyclecalcs.com) with the MIT-licensed Astronomy Engine. Positional astronomy only.",
  "docs": "https://www.cyclecalcs.com/api/reference.html#sun"
}