{"assessment":{"best_window":{"end":"2025-08-17T01:50Z","end_local":"04:50","hours":6.75,"label":"good","mean_quality":0.83,"start":"2025-08-16T19:05Z","start_local":"22:05"},"cost":{"altitude":0.0,"clouds":0.08,"darkness":2.77,"moon":1.23},"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":"Worth it","hourly":[{"alt":null,"cloud":0,"high":0,"iso":"2025-08-16T18:00Z","label":"poor","low":0,"mid":0,"moon_alt":-21,"precip":0.0,"q":0.15,"rh":62,"sky":"nautical twilight","temp":12.5,"time":"21:00","wind":5.1},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-16T19:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-16,"precip":0.0,"q":0.5,"rh":71,"sky":"astronomical twilight","temp":11.2,"time":"22:00","wind":4.4},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-16T20:00Z","label":"good","low":0,"mid":0,"moon_alt":-9,"precip":0.0,"q":1.0,"rh":76,"sky":"night","temp":10.2,"time":"23:00","wind":3.3},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-16T21:00Z","label":"good","low":0,"mid":0,"moon_alt":0,"precip":0.0,"q":1.0,"rh":80,"sky":"night","temp":9.4,"time":"00:00","wind":4.1},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-16T22:00Z","label":"good","low":0,"mid":0,"moon_alt":9,"precip":0.0,"q":0.81,"rh":82,"sky":"night","temp":9.0,"time":"01:00","wind":4.5},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-16T23:00Z","label":"good","low":0,"mid":0,"moon_alt":19,"precip":0.0,"q":0.78,"rh":83,"sky":"night","temp":8.7,"time":"02:00","wind":5.7},{"alt":null,"cloud":5,"high":0,"iso":"2025-08-17T00:00Z","label":"good","low":0,"mid":5,"moon_alt":30,"precip":0.0,"q":0.71,"rh":83,"sky":"night","temp":8.3,"time":"03:00","wind":6.4},{"alt":null,"cloud":4,"high":0,"iso":"2025-08-17T01:00Z","label":"good","low":0,"mid":4,"moon_alt":41,"precip":0.0,"q":0.69,"rh":82,"sky":"night","temp":8.3,"time":"04:00","wind":6.1},{"alt":null,"cloud":2,"high":0,"iso":"2025-08-17T02:00Z","label":"marginal","low":0,"mid":2,"moon_alt":51,"precip":0.0,"q":0.34,"rh":82,"sky":"astronomical twilight","temp":8.0,"time":"05:00","wind":7.3},{"alt":null,"cloud":16,"high":0,"iso":"2025-08-17T03:00Z","label":"poor","low":0,"mid":16,"moon_alt":62,"precip":0.0,"q":0.08,"rh":80,"sky":"nautical twilight","temp":8.1,"time":"06:00","wind":7.6}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":6.25,"reasons":["daylight and twilight cost 2.8 quality-hours","moonlight cost 1.2 quality-hours"],"reference_hours":4.0,"score":99,"score_astronomy":100,"score_weather":99,"sky_hours":6.33,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-08-16T17:50Z","end_local":"20:50","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-08-16T17:15Z","start_local":"20:15"},{"end":"2025-08-16T18:30Z","end_local":"21:30","hours":0.67,"label":"poor","mean_quality":0.15,"start":"2025-08-16T17:50Z","start_local":"20:50"},{"end":"2025-08-16T19:05Z","end_local":"22:05","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2025-08-16T18:30Z","start_local":"21:30"},{"end":"2025-08-17T01:50Z","end_local":"04:50","hours":6.75,"label":"good","mean_quality":0.83,"start":"2025-08-16T19:05Z","start_local":"22:05"},{"end":"2025-08-17T02:30Z","end_local":"05:30","hours":0.67,"label":"marginal","mean_quality":0.34,"start":"2025-08-17T01:50Z","start_local":"04:50"},{"end":"2025-08-17T03:05Z","end_local":"06:05","hours":0.58,"label":"poor","mean_quality":0.1,"start":"2025-08-17T02:30Z","start_local":"05:30"},{"end":"2025-08-17T03:35Z","end_local":"06:35","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-08-17T03:05Z","start_local":"06:05"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":3,"dark":false,"high":0,"local":"20:00","low":0,"mid":3,"precip":0.0,"rh":53,"temp":14.8,"time":"2025-08-16T17:00Z","wind":9.8},{"cloud":0,"dark":false,"high":0,"local":"21:00","low":0,"mid":0,"precip":0.0,"rh":62,"temp":12.5,"time":"2025-08-16T18:00Z","wind":5.1},{"cloud":0,"dark":false,"high":0,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":71,"temp":11.2,"time":"2025-08-16T19:00Z","wind":4.4},{"cloud":0,"dark":true,"high":0,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":76,"temp":10.2,"time":"2025-08-16T20:00Z","wind":3.3},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":9.4,"time":"2025-08-16T21:00Z","wind":4.1},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":9.0,"time":"2025-08-16T22:00Z","wind":4.5},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":8.7,"time":"2025-08-16T23:00Z","wind":5.7},{"cloud":5,"dark":true,"high":0,"local":"03:00","low":0,"mid":5,"precip":0.0,"rh":83,"temp":8.3,"time":"2025-08-17T00:00Z","wind":6.4},{"cloud":4,"dark":true,"high":0,"local":"04:00","low":0,"mid":4,"precip":0.0,"rh":82,"temp":8.3,"time":"2025-08-17T01:00Z","wind":6.1},{"cloud":2,"dark":false,"high":0,"local":"05:00","low":0,"mid":2,"precip":0.0,"rh":82,"temp":8.0,"time":"2025-08-17T02:00Z","wind":7.3},{"cloud":16,"dark":false,"high":0,"local":"06:00","low":0,"mid":16,"precip":0.0,"rh":80,"temp":8.1,"time":"2025-08-17T03:00Z","wind":7.6},{"cloud":24,"dark":false,"high":0,"local":"07:00","low":0,"mid":24,"precip":0.0,"rh":76,"temp":8.6,"time":"2025-08-17T04:00Z","wind":7.8}],"forecast_source":"history","forecast_updated_at":"2026-10-23T13:51:34Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-08-16T19:04:03Z","dark_hours":6.71,"dark_to":"2025-08-17T01:46:50Z","moon":{"illumination":0.418,"phase":"waning crescent","waxing":false},"moon_free_dark_hours":1.97,"moonrise":"2025-08-16T21:03:52Z","moonset":"2025-08-16T11:44:37Z","sunrise":"2025-08-17T03:31:37Z","sunset":"2025-08-16T17:19:18Z","twilight":{"astronomical":{"end":"2025-08-16T19:04:03Z","start":"2025-08-17T01:46:50Z"},"civil":{"end":"2025-08-16T17:49:02Z","start":"2025-08-17T03:01:52Z"},"nautical":{"end":"2025-08-16T18:25:10Z","start":"2025-08-17T02:25:43Z"}},"window_end":"2025-08-17T09:00:00Z","window_start":"2025-08-16T09:00:00Z"},"night_date":"2025-08-16","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
