{"date":"2026-09-07","time_standard":"UTC","latitude":-33.946098,"longitude":151.177002,"definition":{"first_light":"beginning of morning civil twilight","last_light":"end of evening civil twilight","civil_twilight_solar_elevation_deg":-6.0},"first_light_utc":"2026-09-06T19:41:16.858538Z","sunrise_utc":"2026-09-06T20:06:16.680567Z","sunset_utc":"2026-09-07T07:41:09.574505Z","last_light_utc":"2026-09-07T08:06:10.971931Z","daylight_minutes_sunrise_to_sunset":694.9,"civil_light_minutes_first_to_last_light":744.9,"status":"normal","source":"AVWARE solar-position calculation (civil twilight definition aligned with AIP Australia GEN 2.7)","limitations":["Astronomical calculation assumes a clear geometric horizon and does not account for terrain, cloud, smoke, haze or local obstructions.","Sunrise/sunset use the conventional 90.833 degree zenith approximation for refraction and solar radius.","The requested date identifies the daylight period at the supplied longitude; for locations east of Greenwich, morning events may have a UTC timestamp on the preceding calendar date.","For operational aviation use, verify against current approved/operator-authorised sources when required."],"airport":{"code":"YSSY","name":"Sydney Kingsford Smith International Airport","iata":"SYD","icao":"YSSY","city":"Sydney (Mascot)","country_code":"AU","elevation_ft":21}}