{"assessment":{"best_window":null,"cost":{"altitude":0.0,"clouds":5.66,"darkness":2.7,"moon":6.28},"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 12.1 of 13.7 dark hours \u2014 the sky is closed whatever the geometry says.","headline":"Barely","hourly":[{"alt":null,"cloud":53,"high":0,"iso":"2025-12-07T15:00Z","label":"unusable","low":52,"mid":1,"moon_alt":-18,"precip":0.0,"q":0.0,"rh":91,"sky":"civil twilight","temp":1.3,"time":"17:00","wind":7.9},{"alt":null,"cloud":70,"high":0,"iso":"2025-12-07T16:00Z","label":"poor","low":67,"mid":7,"moon_alt":-12,"precip":0.0,"q":0.11,"rh":98,"sky":"astronomical twilight","temp":-0.3,"time":"18:00","wind":7.2},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-07T17:00Z","label":"unusable","low":100,"mid":0,"moon_alt":-4,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":-1.3,"time":"19:00","wind":5.7},{"alt":null,"cloud":100,"high":21,"iso":"2025-12-07T18:00Z","label":"unusable","low":100,"mid":0,"moon_alt":4,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":-0.4,"time":"20:00","wind":5.2},{"alt":null,"cloud":100,"high":2,"iso":"2025-12-07T19:00Z","label":"unusable","low":100,"mid":2,"moon_alt":14,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":-0.4,"time":"21:00","wind":5.5},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-07T20:00Z","label":"unusable","low":100,"mid":10,"moon_alt":25,"precip":0.0,"q":0.0,"rh":98,"sky":"night","temp":-0.1,"time":"22:00","wind":6.3},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-07T21:00Z","label":"unusable","low":100,"mid":5,"moon_alt":35,"precip":0.0,"q":0.0,"rh":97,"sky":"night","temp":-0.3,"time":"23:00","wind":6.1},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-07T22:00Z","label":"unusable","low":100,"mid":0,"moon_alt":46,"precip":0.0,"q":0.0,"rh":96,"sky":"night","temp":-0.2,"time":"00:00","wind":5.9},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-07T23:00Z","label":"unusable","low":100,"mid":2,"moon_alt":56,"precip":0.0,"q":0.0,"rh":98,"sky":"night","temp":-0.6,"time":"01:00","wind":6.0},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-08T00:00Z","label":"unusable","low":100,"mid":9,"moon_alt":66,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":-2.0,"time":"02:00","wind":4.0},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-08T01:00Z","label":"unusable","low":100,"mid":3,"moon_alt":71,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":-1.0,"time":"03:00","wind":5.5},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-08T02:00Z","label":"unusable","low":100,"mid":3,"moon_alt":70,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":-0.8,"time":"04:00","wind":5.0},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-08T03:00Z","label":"unusable","low":100,"mid":9,"moon_alt":63,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":-0.5,"time":"05:00","wind":5.3},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-08T04:00Z","label":"unusable","low":100,"mid":2,"moon_alt":53,"precip":0.0,"q":0.0,"rh":99,"sky":"astronomical twilight","temp":-0.4,"time":"06:00","wind":4.8},{"alt":null,"cloud":100,"high":0,"iso":"2025-12-08T05:00Z","label":"unusable","low":100,"mid":1,"moon_alt":42,"precip":0.0,"q":0.0,"rh":98,"sky":"nautical twilight","temp":-0.3,"time":"07:00","wind":5.5}],"peak_quality":0.22,"peak_sky":1.0,"quality_hours":0.19,"reasons":["moonlight cost 6.3 quality-hours","cloud cover cost 5.7 quality-hours","daylight and twilight cost 2.7 quality-hours"],"reference_hours":4.0,"score":3,"score_astronomy":100,"score_weather":3,"sky_hours":5.85,"verdict":"poor","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-12-07T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-12-07T14:50Z","start_local":"16:50"},{"end":"2025-12-07T17:00Z","end_local":"19:00","hours":1.58,"label":"poor","mean_quality":0.12,"start":"2025-12-07T15:25Z","start_local":"17:25"},{"end":"2025-12-08T05:40Z","end_local":"07:40","hours":12.67,"label":"unusable","mean_quality":0.0,"start":"2025-12-07T17:00Z","start_local":"19:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":100,"dark":false,"high":0,"local":"16:00","low":100,"mid":0,"precip":0.0,"rh":80,"temp":2.6,"time":"2025-12-07T14:00Z","wind":8.0},{"cloud":53,"dark":false,"high":0,"local":"17:00","low":52,"mid":1,"precip":0.0,"rh":91,"temp":1.3,"time":"2025-12-07T15:00Z","wind":7.9},{"cloud":70,"dark":false,"high":0,"local":"18:00","low":67,"mid":7,"precip":0.0,"rh":98,"temp":-0.3,"time":"2025-12-07T16:00Z","wind":7.2},{"cloud":100,"dark":true,"high":0,"local":"19:00","low":100,"mid":0,"precip":0.0,"rh":99,"temp":-1.3,"time":"2025-12-07T17:00Z","wind":5.7},{"cloud":100,"dark":true,"high":21,"local":"20:00","low":100,"mid":0,"precip":0.0,"rh":99,"temp":-0.4,"time":"2025-12-07T18:00Z","wind":5.2},{"cloud":100,"dark":true,"high":2,"local":"21:00","low":100,"mid":2,"precip":0.0,"rh":99,"temp":-0.4,"time":"2025-12-07T19:00Z","wind":5.5},{"cloud":100,"dark":true,"high":0,"local":"22:00","low":100,"mid":10,"precip":0.0,"rh":98,"temp":-0.1,"time":"2025-12-07T20:00Z","wind":6.3},{"cloud":100,"dark":true,"high":0,"local":"23:00","low":100,"mid":5,"precip":0.0,"rh":97,"temp":-0.3,"time":"2025-12-07T21:00Z","wind":6.1},{"cloud":100,"dark":true,"high":0,"local":"00:00","low":100,"mid":0,"precip":0.0,"rh":96,"temp":-0.2,"time":"2025-12-07T22:00Z","wind":5.9},{"cloud":100,"dark":true,"high":0,"local":"01:00","low":100,"mid":2,"precip":0.0,"rh":98,"temp":-0.6,"time":"2025-12-07T23:00Z","wind":6.0},{"cloud":100,"dark":true,"high":0,"local":"02:00","low":100,"mid":9,"precip":0.0,"rh":99,"temp":-2.0,"time":"2025-12-08T00:00Z","wind":4.0},{"cloud":100,"dark":true,"high":0,"local":"03:00","low":100,"mid":3,"precip":0.0,"rh":99,"temp":-1.0,"time":"2025-12-08T01:00Z","wind":5.5},{"cloud":100,"dark":true,"high":0,"local":"04:00","low":100,"mid":3,"precip":0.0,"rh":100,"temp":-0.8,"time":"2025-12-08T02:00Z","wind":5.0},{"cloud":100,"dark":true,"high":0,"local":"05:00","low":100,"mid":9,"precip":0.0,"rh":99,"temp":-0.5,"time":"2025-12-08T03:00Z","wind":5.3},{"cloud":100,"dark":false,"high":0,"local":"06:00","low":100,"mid":2,"precip":0.0,"rh":99,"temp":-0.4,"time":"2025-12-08T04:00Z","wind":4.8},{"cloud":100,"dark":false,"high":0,"local":"07:00","low":100,"mid":1,"precip":0.0,"rh":98,"temp":-0.3,"time":"2025-12-08T05:00Z","wind":5.5},{"cloud":100,"dark":false,"high":0,"local":"08:00","low":100,"mid":9,"precip":0.0,"rh":99,"temp":0.1,"time":"2025-12-08T06:00Z","wind":6.7}],"forecast_source":"history","forecast_updated_at":"2026-10-19T11:42:39Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-12-07T16:30:09Z","dark_hours":11.42,"dark_to":"2025-12-08T03:55:34Z","moon":{"illumination":0.876,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":1.0,"moonrise":"2025-12-07T17:31:17Z","moonset":"2025-12-08T08:58:22Z","sunrise":"2025-12-08T05:35:25Z","sunset":"2025-12-07T14:50:26Z","twilight":{"astronomical":{"end":"2025-12-07T16:30:09Z","start":"2025-12-08T03:55:34Z"},"civil":{"end":"2025-12-07T15:21:42Z","start":"2025-12-08T05:04:06Z"},"nautical":{"end":"2025-12-07T15:56:30Z","start":"2025-12-08T04:29:16Z"}},"window_end":"2025-12-08T10:00:00Z","window_start":"2025-12-07T10:00:00Z"},"night_date":"2025-12-07","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
