{"assessment":{"best_window":{"end":"2025-10-05T19:00Z","end_local":"22:00","hours":1.5,"label":"marginal","mean_quality":0.36,"start":"2025-10-05T17:30Z","start_local":"20:30"},"cost":{"altitude":0.0,"clouds":2.62,"darkness":2.41,"moon":5.91},"formula":"astronomy = 100 * min(1, sky_hours / reference_hours) * peak_sky; overall = astronomy * score_weather / 100 (null when the weather is unknown)","hard_limit":null,"headline":"Barely","hourly":[{"alt":null,"cloud":2,"high":0,"iso":"2025-10-05T16:00Z","label":"unusable","low":0,"mid":2,"moon_alt":9,"precip":0.0,"q":0.0,"rh":68,"sky":"civil twilight","temp":5.1,"time":"19:00","wind":4.4},{"alt":null,"cloud":5,"high":0,"iso":"2025-10-05T17:00Z","label":"poor","low":0,"mid":5,"moon_alt":20,"precip":0.0,"q":0.22,"rh":76,"sky":"astronomical twilight","temp":3.8,"time":"20:00","wind":4.9},{"alt":null,"cloud":13,"high":0,"iso":"2025-10-05T18:00Z","label":"marginal","low":0,"mid":13,"moon_alt":30,"precip":0.0,"q":0.36,"rh":85,"sky":"night","temp":2.7,"time":"21:00","wind":5.9},{"alt":null,"cloud":26,"high":0,"iso":"2025-10-05T19:00Z","label":"poor","low":0,"mid":26,"moon_alt":38,"precip":0.0,"q":0.26,"rh":84,"sky":"night","temp":2.4,"time":"22:00","wind":4.6},{"alt":null,"cloud":48,"high":27,"iso":"2025-10-05T20:00Z","label":"poor","low":0,"mid":29,"moon_alt":44,"precip":0.0,"q":0.16,"rh":82,"sky":"night","temp":2.5,"time":"23:00","wind":5.7},{"alt":null,"cloud":19,"high":13,"iso":"2025-10-05T21:00Z","label":"poor","low":0,"mid":6,"moon_alt":46,"precip":0.0,"q":0.26,"rh":80,"sky":"night","temp":2.3,"time":"00:00","wind":4.9},{"alt":null,"cloud":54,"high":41,"iso":"2025-10-05T22:00Z","label":"poor","low":0,"mid":21,"moon_alt":45,"precip":0.0,"q":0.13,"rh":79,"sky":"night","temp":1.9,"time":"01:00","wind":4.6},{"alt":null,"cloud":72,"high":72,"iso":"2025-10-05T23:00Z","label":"poor","low":0,"mid":2,"moon_alt":40,"precip":0.0,"q":0.07,"rh":78,"sky":"night","temp":1.8,"time":"02:00","wind":4.7},{"alt":null,"cloud":88,"high":87,"iso":"2025-10-06T00:00Z","label":"unusable","low":1,"mid":28,"moon_alt":32,"precip":0.0,"q":0.0,"rh":73,"sky":"night","temp":2.2,"time":"03:00","wind":5.1},{"alt":null,"cloud":95,"high":90,"iso":"2025-10-06T01:00Z","label":"unusable","low":0,"mid":70,"moon_alt":23,"precip":0.0,"q":0.0,"rh":71,"sky":"night","temp":2.1,"time":"04:00","wind":4.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-10-06T02:00Z","label":"unusable","low":2,"mid":100,"moon_alt":13,"precip":0.0,"q":0.0,"rh":68,"sky":"night","temp":2.8,"time":"05:00","wind":5.3},{"alt":null,"cloud":100,"high":100,"iso":"2025-10-06T03:00Z","label":"unusable","low":9,"mid":100,"moon_alt":2,"precip":0.0,"q":0.0,"rh":68,"sky":"astronomical twilight","temp":3.7,"time":"06:00","wind":5.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-10-06T04:00Z","label":"unusable","low":16,"mid":100,"moon_alt":-8,"precip":1.1,"q":0.0,"rh":89,"sky":"civil twilight","temp":2.9,"time":"07:00","wind":5.2}],"peak_quality":0.42,"peak_sky":0.58,"quality_hours":1.57,"reasons":["moonlight cost 5.9 quality-hours","cloud cover cost 2.6 quality-hours","daylight and twilight cost 2.4 quality-hours"],"reference_hours":4.0,"score":22,"score_astronomy":58,"score_weather":37,"sky_hours":4.19,"verdict":"poor","verdict_astronomy":"marginal","weather_known":true,"windows":[{"end":"2025-10-05T16:25Z","end_local":"19:25","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-10-05T15:55Z","start_local":"18:55"},{"end":"2025-10-05T17:30Z","end_local":"20:30","hours":1.08,"label":"poor","mean_quality":0.14,"start":"2025-10-05T16:25Z","start_local":"19:25"},{"end":"2025-10-05T19:00Z","end_local":"22:00","hours":1.5,"label":"marginal","mean_quality":0.36,"start":"2025-10-05T17:30Z","start_local":"20:30"},{"end":"2025-10-06T00:00Z","end_local":"03:00","hours":5.0,"label":"poor","mean_quality":0.18,"start":"2025-10-05T19:00Z","start_local":"22:00"},{"end":"2025-10-06T04:25Z","end_local":"07:25","hours":4.42,"label":"unusable","mean_quality":0.0,"start":"2025-10-06T00:00Z","start_local":"03:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":2,"dark":false,"high":0,"local":"18:00","low":0,"mid":2,"precip":0.0,"rh":53,"temp":8.8,"time":"2025-10-05T15:00Z","wind":4.1},{"cloud":2,"dark":false,"high":0,"local":"19:00","low":0,"mid":2,"precip":0.0,"rh":68,"temp":5.1,"time":"2025-10-05T16:00Z","wind":4.4},{"cloud":5,"dark":false,"high":0,"local":"20:00","low":0,"mid":5,"precip":0.0,"rh":76,"temp":3.8,"time":"2025-10-05T17:00Z","wind":4.9},{"cloud":13,"dark":true,"high":0,"local":"21:00","low":0,"mid":13,"precip":0.0,"rh":85,"temp":2.7,"time":"2025-10-05T18:00Z","wind":5.9},{"cloud":26,"dark":true,"high":0,"local":"22:00","low":0,"mid":26,"precip":0.0,"rh":84,"temp":2.4,"time":"2025-10-05T19:00Z","wind":4.6},{"cloud":48,"dark":true,"high":27,"local":"23:00","low":0,"mid":29,"precip":0.0,"rh":82,"temp":2.5,"time":"2025-10-05T20:00Z","wind":5.7},{"cloud":19,"dark":true,"high":13,"local":"00:00","low":0,"mid":6,"precip":0.0,"rh":80,"temp":2.3,"time":"2025-10-05T21:00Z","wind":4.9},{"cloud":54,"dark":true,"high":41,"local":"01:00","low":0,"mid":21,"precip":0.0,"rh":79,"temp":1.9,"time":"2025-10-05T22:00Z","wind":4.6},{"cloud":72,"dark":true,"high":72,"local":"02:00","low":0,"mid":2,"precip":0.0,"rh":78,"temp":1.8,"time":"2025-10-05T23:00Z","wind":4.7},{"cloud":88,"dark":true,"high":87,"local":"03:00","low":1,"mid":28,"precip":0.0,"rh":73,"temp":2.2,"time":"2025-10-06T00:00Z","wind":5.1},{"cloud":95,"dark":true,"high":90,"local":"04:00","low":0,"mid":70,"precip":0.0,"rh":71,"temp":2.1,"time":"2025-10-06T01:00Z","wind":4.7},{"cloud":100,"dark":true,"high":100,"local":"05:00","low":2,"mid":100,"precip":0.0,"rh":68,"temp":2.8,"time":"2025-10-06T02:00Z","wind":5.3},{"cloud":100,"dark":false,"high":100,"local":"06:00","low":9,"mid":100,"precip":0.0,"rh":68,"temp":3.7,"time":"2025-10-06T03:00Z","wind":5.9},{"cloud":100,"dark":false,"high":100,"local":"07:00","low":16,"mid":100,"precip":1.1,"rh":89,"temp":2.9,"time":"2025-10-06T04:00Z","wind":5.2},{"cloud":100,"dark":false,"high":99,"local":"08:00","low":4,"mid":100,"precip":2.0,"rh":91,"temp":3.3,"time":"2025-10-06T05:00Z","wind":4.3}],"forecast_source":"history","forecast_updated_at":"2026-10-22T11:21:41Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-10-05T17:28:06Z","dark_hours":9.38,"dark_to":"2025-10-06T02:50:57Z","moon":{"illumination":0.978,"phase":"full moon","waxing":true},"moon_free_dark_hours":0.0,"moonrise":"2025-10-05T15:08:26Z","moonset":"2025-10-06T03:11:34Z","sunrise":"2025-10-06T04:23:17Z","sunset":"2025-10-05T15:55:55Z","twilight":{"astronomical":{"end":"2025-10-05T17:28:06Z","start":"2025-10-06T02:50:57Z"},"civil":{"end":"2025-10-05T16:23:38Z","start":"2025-10-06T03:55:31Z"},"nautical":{"end":"2025-10-05T16:55:45Z","start":"2025-10-06T03:23:20Z"}},"window_end":"2025-10-06T09:00:00Z","window_start":"2025-10-05T09:00:00Z"},"night_date":"2025-10-05","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
