{"assessment":{"best_window":{"end":"2026-06-06T22:15Z","end_local":"01:15","hours":2.17,"label":"good","mean_quality":0.8,"start":"2026-06-06T20:05Z","start_local":"23:05"},"cost":{"altitude":0.0,"clouds":1.2,"darkness":3.33,"moon":0.96},"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":12,"high":8,"iso":"2026-06-06T18:00Z","label":"unusable","low":0,"mid":5,"moon_alt":-45,"precip":0.0,"q":0.0,"rh":80,"sky":"civil twilight","temp":12.0,"time":"21:00","wind":3.3},{"alt":null,"cloud":5,"high":1,"iso":"2026-06-06T19:00Z","label":"poor","low":0,"mid":5,"moon_alt":-35,"precip":0.0,"q":0.14,"rh":82,"sky":"nautical twilight","temp":11.0,"time":"22:00","wind":3.6},{"alt":null,"cloud":16,"high":13,"iso":"2026-06-06T20:00Z","label":"marginal","low":0,"mid":4,"moon_alt":-24,"precip":0.0,"q":0.41,"rh":83,"sky":"astronomical twilight","temp":10.3,"time":"23:00","wind":3.4},{"alt":null,"cloud":16,"high":13,"iso":"2026-06-06T21:00Z","label":"good","low":1,"mid":3,"moon_alt":-13,"precip":0.0,"q":0.82,"rh":82,"sky":"night","temp":10.2,"time":"00:00","wind":3.2},{"alt":null,"cloud":33,"high":29,"iso":"2026-06-06T22:00Z","label":"good","low":3,"mid":2,"moon_alt":-2,"precip":0.0,"q":0.63,"rh":82,"sky":"night","temp":10.2,"time":"01:00","wind":2.7},{"alt":null,"cloud":42,"high":39,"iso":"2026-06-06T23:00Z","label":"marginal","low":4,"mid":2,"moon_alt":8,"precip":0.0,"q":0.38,"rh":82,"sky":"night","temp":10.0,"time":"02:00","wind":1.5},{"alt":null,"cloud":33,"high":32,"iso":"2026-06-07T00:00Z","label":"marginal","low":0,"mid":1,"moon_alt":18,"precip":0.0,"q":0.42,"rh":87,"sky":"night","temp":9.2,"time":"03:00","wind":1.7},{"alt":null,"cloud":2,"high":2,"iso":"2026-06-07T01:00Z","label":"marginal","low":0,"mid":1,"moon_alt":26,"precip":0.0,"q":0.31,"rh":86,"sky":"astronomical twilight","temp":9.1,"time":"04:00","wind":1.9},{"alt":null,"cloud":2,"high":0,"iso":"2026-06-07T02:00Z","label":"poor","low":1,"mid":2,"moon_alt":32,"precip":0.0,"q":0.09,"rh":84,"sky":"nautical twilight","temp":8.8,"time":"05:00","wind":2.3}],"peak_quality":0.82,"peak_sky":1.0,"quality_hours":3.52,"reasons":["daylight and twilight cost 3.3 quality-hours","cloud cover cost 1.2 quality-hours","moonlight cost 1.0 quality-hours"],"reference_hours":4.0,"score":75,"score_astronomy":100,"score_weather":75,"sky_hours":4.71,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-06-06T18:30Z","end_local":"21:30","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2026-06-06T17:50Z","start_local":"20:50"},{"end":"2026-06-06T19:10Z","end_local":"22:10","hours":0.67,"label":"poor","mean_quality":0.13,"start":"2026-06-06T18:30Z","start_local":"21:30"},{"end":"2026-06-06T20:05Z","end_local":"23:05","hours":0.92,"label":"marginal","mean_quality":0.47,"start":"2026-06-06T19:10Z","start_local":"22:10"},{"end":"2026-06-06T22:15Z","end_local":"01:15","hours":2.17,"label":"good","mean_quality":0.8,"start":"2026-06-06T20:05Z","start_local":"23:05"},{"end":"2026-06-07T00:40Z","end_local":"03:40","hours":2.42,"label":"marginal","mean_quality":0.41,"start":"2026-06-06T22:15Z","start_local":"01:15"},{"end":"2026-06-07T01:00Z","end_local":"04:00","hours":0.33,"label":"poor","mean_quality":0.2,"start":"2026-06-07T00:40Z","start_local":"03:40"},{"end":"2026-06-07T01:30Z","end_local":"04:30","hours":0.5,"label":"marginal","mean_quality":0.3,"start":"2026-06-07T01:00Z","start_local":"04:00"},{"end":"2026-06-07T02:15Z","end_local":"05:15","hours":0.75,"label":"poor","mean_quality":0.09,"start":"2026-06-07T01:30Z","start_local":"04:30"},{"end":"2026-06-07T02:50Z","end_local":"05:50","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-06-07T02:15Z","start_local":"05:15"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":34,"dark":false,"high":27,"local":"20:00","low":2,"mid":10,"precip":0.0,"rh":75,"temp":14.0,"time":"2026-06-06T17:00Z","wind":5.7},{"cloud":12,"dark":false,"high":8,"local":"21:00","low":0,"mid":5,"precip":0.0,"rh":80,"temp":12.0,"time":"2026-06-06T18:00Z","wind":3.3},{"cloud":5,"dark":false,"high":1,"local":"22:00","low":0,"mid":5,"precip":0.0,"rh":82,"temp":11.0,"time":"2026-06-06T19:00Z","wind":3.6},{"cloud":16,"dark":false,"high":13,"local":"23:00","low":0,"mid":4,"precip":0.0,"rh":83,"temp":10.3,"time":"2026-06-06T20:00Z","wind":3.4},{"cloud":16,"dark":true,"high":13,"local":"00:00","low":1,"mid":3,"precip":0.0,"rh":82,"temp":10.2,"time":"2026-06-06T21:00Z","wind":3.2},{"cloud":33,"dark":true,"high":29,"local":"01:00","low":3,"mid":2,"precip":0.0,"rh":82,"temp":10.2,"time":"2026-06-06T22:00Z","wind":2.7},{"cloud":42,"dark":true,"high":39,"local":"02:00","low":4,"mid":2,"precip":0.0,"rh":82,"temp":10.0,"time":"2026-06-06T23:00Z","wind":1.5},{"cloud":33,"dark":true,"high":32,"local":"03:00","low":0,"mid":1,"precip":0.0,"rh":87,"temp":9.2,"time":"2026-06-07T00:00Z","wind":1.7},{"cloud":2,"dark":false,"high":2,"local":"04:00","low":0,"mid":1,"precip":0.0,"rh":86,"temp":9.1,"time":"2026-06-07T01:00Z","wind":1.9},{"cloud":2,"dark":false,"high":0,"local":"05:00","low":1,"mid":2,"precip":0.0,"rh":84,"temp":8.8,"time":"2026-06-07T02:00Z","wind":2.3},{"cloud":2,"dark":false,"high":0,"local":"06:00","low":2,"mid":0,"precip":0.0,"rh":82,"temp":8.8,"time":"2026-06-07T03:00Z","wind":2.4}],"forecast_source":"history","forecast_updated_at":"2026-10-12T17:55:30Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-06-06T20:00:46Z","dark_hours":4.63,"dark_to":"2026-06-07T00:38:44Z","moon":{"illumination":0.65,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":2.22,"moonrise":"2026-06-06T22:14:26Z","moonset":null,"sunrise":"2026-06-07T02:46:56Z","sunset":"2026-06-06T17:52:35Z","twilight":{"astronomical":{"end":"2026-06-06T20:00:46Z","start":"2026-06-07T00:38:44Z"},"civil":{"end":"2026-06-06T18:26:21Z","start":"2026-06-07T02:13:09Z"},"nautical":{"end":"2026-06-06T19:09:32Z","start":"2026-06-07T01:29:59Z"}},"window_end":"2026-06-07T09:00:00Z","window_start":"2026-06-06T09:00:00Z"},"night_date":"2026-06-06","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}