{"assessment":{"best_window":null,"cost":{"altitude":0.0,"clouds":9.96,"darkness":2.66,"moon":2.05},"formula":"astronomy = 100 * min(1, sky_hours / reference_hours) * peak_sky; overall = astronomy * score_weather / 100 (null when the weather is unknown)","hard_limit":"Overcast (\u226580 % cloud) for 13.6 of 13.6 dark hours \u2014 the sky is closed whatever the geometry says.","headline":"Not tonight","hourly":[{"alt":null,"cloud":100,"high":99,"iso":"2025-11-28T15:00Z","label":"unusable","low":100,"mid":79,"moon_alt":35,"precip":0.6,"q":0.0,"rh":99,"sky":"civil twilight","temp":1.1,"time":"17:00","wind":11.0},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-28T16:00Z","label":"unusable","low":100,"mid":98,"moon_alt":39,"precip":0.4,"q":0.0,"rh":99,"sky":"astronomical twilight","temp":1.5,"time":"18:00","wind":10.7},{"alt":null,"cloud":100,"high":94,"iso":"2025-11-28T17:00Z","label":"unusable","low":100,"mid":86,"moon_alt":40,"precip":0.4,"q":0.0,"rh":100,"sky":"night","temp":1.7,"time":"19:00","wind":11.4},{"alt":null,"cloud":100,"high":95,"iso":"2025-11-28T18:00Z","label":"unusable","low":100,"mid":67,"moon_alt":38,"precip":0.4,"q":0.0,"rh":99,"sky":"night","temp":2.2,"time":"20:00","wind":12.6},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-28T19:00Z","label":"unusable","low":100,"mid":73,"moon_alt":32,"precip":0.1,"q":0.0,"rh":99,"sky":"night","temp":2.2,"time":"21:00","wind":11.9},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-28T20:00Z","label":"unusable","low":100,"mid":98,"moon_alt":24,"precip":1.3,"q":0.0,"rh":99,"sky":"night","temp":2.0,"time":"22:00","wind":10.1},{"alt":null,"cloud":100,"high":97,"iso":"2025-11-28T21:00Z","label":"unusable","low":100,"mid":98,"moon_alt":15,"precip":3.1,"q":0.0,"rh":100,"sky":"night","temp":2.0,"time":"23:00","wind":18.6},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-28T22:00Z","label":"unusable","low":100,"mid":90,"moon_alt":5,"precip":0.4,"q":0.0,"rh":100,"sky":"night","temp":2.1,"time":"00:00","wind":15.4},{"alt":null,"cloud":100,"high":98,"iso":"2025-11-28T23:00Z","label":"unusable","low":100,"mid":86,"moon_alt":-6,"precip":5.0,"q":0.0,"rh":99,"sky":"night","temp":0.7,"time":"01:00","wind":6.7},{"alt":null,"cloud":100,"high":88,"iso":"2025-11-29T00:00Z","label":"unusable","low":100,"mid":100,"moon_alt":-17,"precip":0.5,"q":0.0,"rh":100,"sky":"night","temp":1.2,"time":"02:00","wind":6.4},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-29T01:00Z","label":"unusable","low":100,"mid":41,"moon_alt":-27,"precip":0.1,"q":0.0,"rh":99,"sky":"night","temp":0.9,"time":"03:00","wind":7.2},{"alt":null,"cloud":100,"high":52,"iso":"2025-11-29T02:00Z","label":"unusable","low":100,"mid":26,"moon_alt":-37,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":0.5,"time":"04:00","wind":8.6},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-29T03:00Z","label":"unusable","low":100,"mid":88,"moon_alt":-45,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":0.5,"time":"05:00","wind":7.5},{"alt":null,"cloud":100,"high":33,"iso":"2025-11-29T04:00Z","label":"unusable","low":100,"mid":79,"moon_alt":-51,"precip":0.0,"q":0.0,"rh":99,"sky":"astronomical twilight","temp":0.6,"time":"06:00","wind":7.1},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-29T05:00Z","label":"unusable","low":100,"mid":95,"moon_alt":-53,"precip":0.0,"q":0.0,"rh":100,"sky":"civil twilight","temp":0.6,"time":"07:00","wind":5.1}],"peak_quality":0.0,"peak_sky":1.0,"quality_hours":0.0,"reasons":["cloud cover cost 10.0 quality-hours","daylight and twilight cost 2.7 quality-hours","moonlight cost 2.0 quality-hours"],"reference_hours":4.0,"score":0,"score_astronomy":100,"score_weather":0,"sky_hours":9.96,"verdict":"unusable","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-11-29T05:30Z","end_local":"07:30","hours":14.67,"label":"unusable","mean_quality":0.0,"start":"2025-11-28T14:50Z","start_local":"16:50"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":100,"dark":false,"high":100,"local":"16:00","low":100,"mid":100,"precip":1.2,"rh":100,"temp":1.0,"time":"2025-11-28T14:00Z","wind":10.7},{"cloud":100,"dark":false,"high":99,"local":"17:00","low":100,"mid":79,"precip":0.6,"rh":99,"temp":1.1,"time":"2025-11-28T15:00Z","wind":11.0},{"cloud":100,"dark":false,"high":100,"local":"18:00","low":100,"mid":98,"precip":0.4,"rh":99,"temp":1.5,"time":"2025-11-28T16:00Z","wind":10.7},{"cloud":100,"dark":true,"high":94,"local":"19:00","low":100,"mid":86,"precip":0.4,"rh":100,"temp":1.7,"time":"2025-11-28T17:00Z","wind":11.4},{"cloud":100,"dark":true,"high":95,"local":"20:00","low":100,"mid":67,"precip":0.4,"rh":99,"temp":2.2,"time":"2025-11-28T18:00Z","wind":12.6},{"cloud":100,"dark":true,"high":99,"local":"21:00","low":100,"mid":73,"precip":0.1,"rh":99,"temp":2.2,"time":"2025-11-28T19:00Z","wind":11.9},{"cloud":100,"dark":true,"high":99,"local":"22:00","low":100,"mid":98,"precip":1.3,"rh":99,"temp":2.0,"time":"2025-11-28T20:00Z","wind":10.1},{"cloud":100,"dark":true,"high":97,"local":"23:00","low":100,"mid":98,"precip":3.1,"rh":100,"temp":2.0,"time":"2025-11-28T21:00Z","wind":18.6},{"cloud":100,"dark":true,"high":99,"local":"00:00","low":100,"mid":90,"precip":0.4,"rh":100,"temp":2.1,"time":"2025-11-28T22:00Z","wind":15.4},{"cloud":100,"dark":true,"high":98,"local":"01:00","low":100,"mid":86,"precip":5.0,"rh":99,"temp":0.7,"time":"2025-11-28T23:00Z","wind":6.7},{"cloud":100,"dark":true,"high":88,"local":"02:00","low":100,"mid":100,"precip":0.5,"rh":100,"temp":1.2,"time":"2025-11-29T00:00Z","wind":6.4},{"cloud":100,"dark":true,"high":99,"local":"03:00","low":100,"mid":41,"precip":0.1,"rh":99,"temp":0.9,"time":"2025-11-29T01:00Z","wind":7.2},{"cloud":100,"dark":true,"high":52,"local":"04:00","low":100,"mid":26,"precip":0.0,"rh":100,"temp":0.5,"time":"2025-11-29T02:00Z","wind":8.6},{"cloud":100,"dark":true,"high":99,"local":"05:00","low":100,"mid":88,"precip":0.0,"rh":100,"temp":0.5,"time":"2025-11-29T03:00Z","wind":7.5},{"cloud":100,"dark":false,"high":33,"local":"06:00","low":100,"mid":79,"precip":0.0,"rh":99,"temp":0.6,"time":"2025-11-29T04:00Z","wind":7.1},{"cloud":100,"dark":false,"high":100,"local":"07:00","low":100,"mid":95,"precip":0.0,"rh":100,"temp":0.6,"time":"2025-11-29T05:00Z","wind":5.1},{"cloud":100,"dark":false,"high":100,"local":"08:00","low":100,"mid":100,"precip":0.2,"rh":98,"temp":0.7,"time":"2025-11-29T06:00Z","wind":5.6}],"forecast_source":"history","forecast_updated_at":"2026-10-19T16:05:50Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-11-28T16:30:56Z","dark_hours":11.28,"dark_to":"2025-11-29T03:47:46Z","moon":{"illumination":0.567,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":5.35,"moonrise":"2025-11-28T11:09:48Z","moonset":"2025-11-28T22:25:36Z","sunrise":"2025-11-29T05:26:28Z","sunset":"2025-11-28T14:52:25Z","twilight":{"astronomical":{"end":"2025-11-28T16:30:56Z","start":"2025-11-29T03:47:46Z"},"civil":{"end":"2025-11-28T15:23:11Z","start":"2025-11-29T04:55:37Z"},"nautical":{"end":"2025-11-28T15:57:34Z","start":"2025-11-29T04:21:11Z"}},"window_end":"2025-11-29T10:00:00Z","window_start":"2025-11-28T10:00:00Z"},"night_date":"2025-11-28","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}