{"assessment":{"best_window":{"end":"2026-08-09T00:00Z","end_local":"03:00","hours":4.67,"label":"good","mean_quality":0.82,"start":"2026-08-08T19:20Z","start_local":"22:20"},"cost":{"altitude":0.0,"clouds":1.56,"darkness":2.78,"moon":0.29},"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":16,"high":0,"iso":"2026-08-08T18:00Z","label":"unusable","low":4,"mid":13,"moon_alt":-21,"precip":0.0,"q":0.0,"rh":72,"sky":"civil twilight","temp":15.1,"time":"21:00","wind":6.3},{"alt":null,"cloud":10,"high":0,"iso":"2026-08-08T19:00Z","label":"marginal","low":0,"mid":9,"moon_alt":-21,"precip":0.0,"q":0.44,"rh":78,"sky":"astronomical twilight","temp":14.4,"time":"22:00","wind":6.5},{"alt":null,"cloud":9,"high":0,"iso":"2026-08-08T20:00Z","label":"good","low":1,"mid":8,"moon_alt":-19,"precip":0.0,"q":0.9,"rh":83,"sky":"night","temp":13.6,"time":"23:00","wind":5.1},{"alt":null,"cloud":8,"high":0,"iso":"2026-08-08T21:00Z","label":"good","low":5,"mid":5,"moon_alt":-14,"precip":0.0,"q":0.91,"rh":84,"sky":"night","temp":13.2,"time":"00:00","wind":3.9},{"alt":null,"cloud":30,"high":0,"iso":"2026-08-08T22:00Z","label":"good","low":25,"mid":10,"moon_alt":-8,"precip":0.0,"q":0.67,"rh":85,"sky":"night","temp":13.1,"time":"01:00","wind":4.2},{"alt":null,"cloud":15,"high":2,"iso":"2026-08-08T23:00Z","label":"good","low":11,"mid":3,"moon_alt":0,"precip":0.0,"q":0.77,"rh":86,"sky":"night","temp":12.9,"time":"02:00","wind":5.4},{"alt":null,"cloud":41,"high":0,"iso":"2026-08-09T00:00Z","label":"marginal","low":30,"mid":16,"moon_alt":9,"precip":0.0,"q":0.5,"rh":90,"sky":"night","temp":12.3,"time":"03:00","wind":5.6},{"alt":null,"cloud":39,"high":0,"iso":"2026-08-09T01:00Z","label":"marginal","low":21,"mid":30,"moon_alt":19,"precip":0.1,"q":0.51,"rh":91,"sky":"night","temp":12.3,"time":"04:00","wind":6.2},{"alt":null,"cloud":12,"high":0,"iso":"2026-08-09T02:00Z","label":"marginal","low":9,"mid":2,"moon_alt":29,"precip":0.0,"q":0.38,"rh":90,"sky":"astronomical twilight","temp":12.2,"time":"05:00","wind":4.6},{"alt":null,"cloud":19,"high":0,"iso":"2026-08-09T03:00Z","label":"unusable","low":16,"mid":3,"moon_alt":40,"precip":0.0,"q":0.0,"rh":91,"sky":"civil twilight","temp":11.7,"time":"06:00","wind":5.1}],"peak_quality":0.91,"peak_sky":1.0,"quality_hours":5.28,"reasons":["daylight and twilight cost 2.8 quality-hours","cloud cover cost 1.6 quality-hours"],"reference_hours":4.0,"score":77,"score_astronomy":100,"score_weather":77,"sky_hours":6.84,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-08-08T18:05Z","end_local":"21:05","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-08-08T17:30Z","start_local":"20:30"},{"end":"2026-08-08T18:40Z","end_local":"21:40","hours":0.58,"label":"poor","mean_quality":0.12,"start":"2026-08-08T18:05Z","start_local":"21:05"},{"end":"2026-08-08T19:20Z","end_local":"22:20","hours":0.67,"label":"marginal","mean_quality":0.43,"start":"2026-08-08T18:40Z","start_local":"21:40"},{"end":"2026-08-09T00:00Z","end_local":"03:00","hours":4.67,"label":"good","mean_quality":0.82,"start":"2026-08-08T19:20Z","start_local":"22:20"},{"end":"2026-08-09T01:35Z","end_local":"04:35","hours":1.58,"label":"marginal","mean_quality":0.5,"start":"2026-08-09T00:00Z","start_local":"03:00"},{"end":"2026-08-09T02:00Z","end_local":"05:00","hours":0.42,"label":"poor","mean_quality":0.25,"start":"2026-08-09T01:35Z","start_local":"04:35"},{"end":"2026-08-09T02:20Z","end_local":"05:20","hours":0.33,"label":"marginal","mean_quality":0.38,"start":"2026-08-09T02:00Z","start_local":"05:00"},{"end":"2026-08-09T02:55Z","end_local":"05:55","hours":0.58,"label":"poor","mean_quality":0.11,"start":"2026-08-09T02:20Z","start_local":"05:20"},{"end":"2026-08-09T03:25Z","end_local":"06:25","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-08-09T02:55Z","start_local":"05:55"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":13,"dark":false,"high":2,"local":"20:00","low":5,"mid":6,"precip":0.0,"rh":62,"temp":17.3,"time":"2026-08-08T17:00Z","wind":7.4},{"cloud":16,"dark":false,"high":0,"local":"21:00","low":4,"mid":13,"precip":0.0,"rh":72,"temp":15.1,"time":"2026-08-08T18:00Z","wind":6.3},{"cloud":10,"dark":false,"high":0,"local":"22:00","low":0,"mid":9,"precip":0.0,"rh":78,"temp":14.4,"time":"2026-08-08T19:00Z","wind":6.5},{"cloud":9,"dark":true,"high":0,"local":"23:00","low":1,"mid":8,"precip":0.0,"rh":83,"temp":13.6,"time":"2026-08-08T20:00Z","wind":5.1},{"cloud":8,"dark":true,"high":0,"local":"00:00","low":5,"mid":5,"precip":0.0,"rh":84,"temp":13.2,"time":"2026-08-08T21:00Z","wind":3.9},{"cloud":30,"dark":true,"high":0,"local":"01:00","low":25,"mid":10,"precip":0.0,"rh":85,"temp":13.1,"time":"2026-08-08T22:00Z","wind":4.2},{"cloud":15,"dark":true,"high":2,"local":"02:00","low":11,"mid":3,"precip":0.0,"rh":86,"temp":12.9,"time":"2026-08-08T23:00Z","wind":5.4},{"cloud":41,"dark":true,"high":0,"local":"03:00","low":30,"mid":16,"precip":0.0,"rh":90,"temp":12.3,"time":"2026-08-09T00:00Z","wind":5.6},{"cloud":39,"dark":true,"high":0,"local":"04:00","low":21,"mid":30,"precip":0.1,"rh":91,"temp":12.3,"time":"2026-08-09T01:00Z","wind":6.2},{"cloud":12,"dark":false,"high":0,"local":"05:00","low":9,"mid":2,"precip":0.0,"rh":90,"temp":12.2,"time":"2026-08-09T02:00Z","wind":4.6},{"cloud":19,"dark":false,"high":0,"local":"06:00","low":16,"mid":3,"precip":0.0,"rh":91,"temp":11.7,"time":"2026-08-09T03:00Z","wind":5.1},{"cloud":100,"dark":false,"high":0,"local":"07:00","low":100,"mid":9,"precip":0.0,"rh":93,"temp":12.1,"time":"2026-08-09T04:00Z","wind":7.4}],"forecast_source":"history","forecast_updated_at":"2026-10-11T04:50:18Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-08-08T19:19:41Z","dark_hours":6.24,"dark_to":"2026-08-09T01:34:05Z","moon":{"illumination":0.194,"phase":"waning crescent","waxing":false},"moon_free_dark_hours":3.67,"moonrise":"2026-08-08T23:00:41Z","moonset":"2026-08-08T14:09:39Z","sunrise":"2026-08-09T03:23:10Z","sunset":"2026-08-08T17:30:37Z","twilight":{"astronomical":{"end":"2026-08-08T19:19:41Z","start":"2026-08-09T01:34:05Z"},"civil":{"end":"2026-08-08T18:01:09Z","start":"2026-08-09T02:52:37Z"},"nautical":{"end":"2026-08-08T18:38:39Z","start":"2026-08-09T02:15:07Z"}},"window_end":"2026-08-09T09:00:00Z","window_start":"2026-08-08T09:00:00Z"},"night_date":"2026-08-08","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
