{"assessment":{"best_window":{"end":"2026-08-23T02:00Z","end_local":"05:00","hours":3.67,"label":"good","mean_quality":0.96,"start":"2026-08-22T22:20Z","start_local":"01:20"},"cost":{"altitude":0.0,"clouds":0.54,"darkness":2.65,"moon":1.39},"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":10,"high":9,"iso":"2026-08-22T18:00Z","label":"poor","low":0,"mid":1,"moon_alt":19,"precip":0.0,"q":0.08,"rh":65,"sky":"nautical twilight","temp":17.4,"time":"21:00","wind":3.2},{"alt":null,"cloud":2,"high":1,"iso":"2026-08-22T19:00Z","label":"marginal","low":0,"mid":1,"moon_alt":18,"precip":0.0,"q":0.59,"rh":63,"sky":"night","temp":17.2,"time":"22:00","wind":2.4},{"alt":null,"cloud":2,"high":2,"iso":"2026-08-22T20:00Z","label":"good","low":0,"mid":1,"moon_alt":15,"precip":0.0,"q":0.61,"rh":62,"sky":"night","temp":17.0,"time":"23:00","wind":3.1},{"alt":null,"cloud":38,"high":37,"iso":"2026-08-22T21:00Z","label":"marginal","low":0,"mid":3,"moon_alt":10,"precip":0.0,"q":0.37,"rh":64,"sky":"night","temp":16.4,"time":"00:00","wind":5.0},{"alt":null,"cloud":15,"high":15,"iso":"2026-08-22T22:00Z","label":"marginal","low":0,"mid":0,"moon_alt":3,"precip":0.0,"q":0.57,"rh":66,"sky":"night","temp":16.2,"time":"01:00","wind":5.8},{"alt":null,"cloud":4,"high":2,"iso":"2026-08-22T23:00Z","label":"good","low":0,"mid":2,"moon_alt":-6,"precip":0.0,"q":0.96,"rh":68,"sky":"night","temp":15.8,"time":"02:00","wind":4.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-23T00:00Z","label":"good","low":0,"mid":0,"moon_alt":-15,"precip":0.0,"q":1.0,"rh":73,"sky":"night","temp":14.5,"time":"03:00","wind":4.8},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-23T01:00Z","label":"good","low":0,"mid":0,"moon_alt":-25,"precip":0.0,"q":1.0,"rh":73,"sky":"night","temp":14.4,"time":"04:00","wind":5.0},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-23T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-36,"precip":0.0,"q":0.5,"rh":75,"sky":"astronomical twilight","temp":13.8,"time":"05:00","wind":5.0},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-23T03:00Z","label":"poor","low":0,"mid":0,"moon_alt":-46,"precip":0.0,"q":0.15,"rh":76,"sky":"nautical twilight","temp":13.6,"time":"06:00","wind":4.2}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.92,"reasons":["daylight and twilight cost 2.6 quality-hours","moonlight cost 1.4 quality-hours","cloud cover cost 0.5 quality-hours"],"reference_hours":4.0,"score":92,"score_astronomy":100,"score_weather":92,"sky_hours":6.46,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-08-22T17:40Z","end_local":"20:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-08-22T17:10Z","start_local":"20:10"},{"end":"2026-08-22T18:55Z","end_local":"21:55","hours":1.25,"label":"poor","mean_quality":0.16,"start":"2026-08-22T17:40Z","start_local":"20:40"},{"end":"2026-08-22T19:50Z","end_local":"22:50","hours":0.92,"label":"marginal","mean_quality":0.59,"start":"2026-08-22T18:55Z","start_local":"21:55"},{"end":"2026-08-22T21:00Z","end_local":"00:00","hours":1.17,"label":"good","mean_quality":0.61,"start":"2026-08-22T19:50Z","start_local":"22:50"},{"end":"2026-08-22T22:20Z","end_local":"01:20","hours":1.33,"label":"marginal","mean_quality":0.43,"start":"2026-08-22T21:00Z","start_local":"00:00"},{"end":"2026-08-23T02:00Z","end_local":"05:00","hours":3.67,"label":"good","mean_quality":0.96,"start":"2026-08-22T22:20Z","start_local":"01:20"},{"end":"2026-08-23T02:35Z","end_local":"05:35","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2026-08-23T02:00Z","start_local":"05:00"},{"end":"2026-08-23T03:10Z","end_local":"06:10","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2026-08-23T02:35Z","start_local":"05:35"},{"end":"2026-08-23T03:40Z","end_local":"06:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-08-23T03:10Z","start_local":"06:10"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":37,"dark":false,"high":36,"local":"20:00","low":0,"mid":2,"precip":0.0,"rh":65,"temp":18.1,"time":"2026-08-22T17:00Z","wind":3.6},{"cloud":10,"dark":false,"high":9,"local":"21:00","low":0,"mid":1,"precip":0.0,"rh":65,"temp":17.4,"time":"2026-08-22T18:00Z","wind":3.2},{"cloud":2,"dark":true,"high":1,"local":"22:00","low":0,"mid":1,"precip":0.0,"rh":63,"temp":17.2,"time":"2026-08-22T19:00Z","wind":2.4},{"cloud":2,"dark":true,"high":2,"local":"23:00","low":0,"mid":1,"precip":0.0,"rh":62,"temp":17.0,"time":"2026-08-22T20:00Z","wind":3.1},{"cloud":38,"dark":true,"high":37,"local":"00:00","low":0,"mid":3,"precip":0.0,"rh":64,"temp":16.4,"time":"2026-08-22T21:00Z","wind":5.0},{"cloud":15,"dark":true,"high":15,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":66,"temp":16.2,"time":"2026-08-22T22:00Z","wind":5.8},{"cloud":4,"dark":true,"high":2,"local":"02:00","low":0,"mid":2,"precip":0.0,"rh":68,"temp":15.8,"time":"2026-08-22T23:00Z","wind":4.9},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":73,"temp":14.5,"time":"2026-08-23T00:00Z","wind":4.8},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":73,"temp":14.4,"time":"2026-08-23T01:00Z","wind":5.0},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":75,"temp":13.8,"time":"2026-08-23T02:00Z","wind":5.0},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":76,"temp":13.6,"time":"2026-08-23T03:00Z","wind":4.2},{"cloud":0,"dark":false,"high":0,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":76,"temp":13.6,"time":"2026-08-23T04:00Z","wind":4.3}],"forecast_source":"history","forecast_updated_at":"2026-10-10T22:01:35Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-08-22T18:52:46Z","dark_hours":7.04,"dark_to":"2026-08-23T01:55:25Z","moon":{"illumination":0.755,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":3.6,"moonrise":"2026-08-22T14:02:58Z","moonset":"2026-08-22T22:18:31Z","sunrise":"2026-08-23T03:37:33Z","sunset":"2026-08-22T17:10:41Z","twilight":{"astronomical":{"end":"2026-08-22T18:52:46Z","start":"2026-08-23T01:55:25Z"},"civil":{"end":"2026-08-22T17:39:54Z","start":"2026-08-23T03:08:18Z"},"nautical":{"end":"2026-08-22T18:15:12Z","start":"2026-08-23T02:33:00Z"}},"window_end":"2026-08-23T09:00:00Z","window_start":"2026-08-22T09:00:00Z"},"night_date":"2026-08-22","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}