{"assessment":{"best_window":{"end":"2025-07-11T00:55Z","end_local":"03:55","hours":4.83,"label":"marginal","mean_quality":0.4,"start":"2025-07-10T20:05Z","start_local":"23:05"},"cost":{"altitude":0.0,"clouds":0.56,"darkness":3.22,"moon":3.03},"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":82,"high":0,"iso":"2025-07-10T18:00Z","label":"unusable","low":81,"mid":3,"moon_alt":-2,"precip":0.0,"q":0.0,"rh":61,"sky":"civil twilight","temp":11.4,"time":"21:00","wind":9.9},{"alt":null,"cloud":37,"high":0,"iso":"2025-07-10T19:00Z","label":"poor","low":33,"mid":6,"moon_alt":6,"precip":0.0,"q":0.05,"rh":65,"sky":"nautical twilight","temp":10.4,"time":"22:00","wind":8.5},{"alt":null,"cloud":7,"high":0,"iso":"2025-07-10T20:00Z","label":"poor","low":5,"mid":2,"moon_alt":13,"precip":0.0,"q":0.24,"rh":69,"sky":"astronomical twilight","temp":9.7,"time":"23:00","wind":8.9},{"alt":null,"cloud":4,"high":0,"iso":"2025-07-10T21:00Z","label":"marginal","low":4,"mid":0,"moon_alt":18,"precip":0.0,"q":0.46,"rh":74,"sky":"night","temp":8.8,"time":"00:00","wind":8.9},{"alt":null,"cloud":24,"high":0,"iso":"2025-07-10T22:00Z","label":"marginal","low":24,"mid":2,"moon_alt":21,"precip":0.0,"q":0.34,"rh":79,"sky":"night","temp":7.9,"time":"01:00","wind":6.8},{"alt":null,"cloud":28,"high":0,"iso":"2025-07-10T23:00Z","label":"marginal","low":23,"mid":12,"moon_alt":21,"precip":0.0,"q":0.32,"rh":83,"sky":"night","temp":7.3,"time":"02:00","wind":7.3},{"alt":null,"cloud":5,"high":0,"iso":"2025-07-11T00:00Z","label":"marginal","low":0,"mid":5,"moon_alt":19,"precip":0.0,"q":0.45,"rh":81,"sky":"night","temp":7.8,"time":"03:00","wind":8.9},{"alt":null,"cloud":29,"high":0,"iso":"2025-07-11T01:00Z","label":"poor","low":4,"mid":26,"moon_alt":14,"precip":0.0,"q":0.17,"rh":84,"sky":"astronomical twilight","temp":7.5,"time":"04:00","wind":8.8},{"alt":null,"cloud":25,"high":0,"iso":"2025-07-11T02:00Z","label":"poor","low":11,"mid":23,"moon_alt":7,"precip":0.0,"q":0.06,"rh":86,"sky":"nautical twilight","temp":7.1,"time":"05:00","wind":8.4}],"peak_quality":0.47,"peak_sky":0.51,"quality_hours":2.28,"reasons":["daylight and twilight cost 3.2 quality-hours","moonlight cost 3.0 quality-hours","cloud cover cost 0.6 quality-hours"],"reference_hours":4.0,"score":29,"score_astronomy":36,"score_weather":80,"sky_hours":2.84,"verdict":"poor","verdict_astronomy":"poor","weather_known":true,"windows":[{"end":"2025-07-10T19:00Z","end_local":"22:00","hours":1.08,"label":"unusable","mean_quality":0.0,"start":"2025-07-10T17:55Z","start_local":"20:55"},{"end":"2025-07-10T20:05Z","end_local":"23:05","hours":1.08,"label":"poor","mean_quality":0.14,"start":"2025-07-10T19:00Z","start_local":"22:00"},{"end":"2025-07-11T00:55Z","end_local":"03:55","hours":4.83,"label":"marginal","mean_quality":0.4,"start":"2025-07-10T20:05Z","start_local":"23:05"},{"end":"2025-07-11T02:25Z","end_local":"05:25","hours":1.5,"label":"poor","mean_quality":0.13,"start":"2025-07-11T00:55Z","start_local":"03:55"},{"end":"2025-07-11T03:00Z","end_local":"06:00","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-07-11T02:25Z","start_local":"05:25"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":92,"dark":false,"high":0,"local":"20:00","low":91,"mid":25,"precip":0.0,"rh":56,"temp":12.9,"time":"2025-07-10T17:00Z","wind":12.2},{"cloud":82,"dark":false,"high":0,"local":"21:00","low":81,"mid":3,"precip":0.0,"rh":61,"temp":11.4,"time":"2025-07-10T18:00Z","wind":9.9},{"cloud":37,"dark":false,"high":0,"local":"22:00","low":33,"mid":6,"precip":0.0,"rh":65,"temp":10.4,"time":"2025-07-10T19:00Z","wind":8.5},{"cloud":7,"dark":false,"high":0,"local":"23:00","low":5,"mid":2,"precip":0.0,"rh":69,"temp":9.7,"time":"2025-07-10T20:00Z","wind":8.9},{"cloud":4,"dark":true,"high":0,"local":"00:00","low":4,"mid":0,"precip":0.0,"rh":74,"temp":8.8,"time":"2025-07-10T21:00Z","wind":8.9},{"cloud":24,"dark":true,"high":0,"local":"01:00","low":24,"mid":2,"precip":0.0,"rh":79,"temp":7.9,"time":"2025-07-10T22:00Z","wind":6.8},{"cloud":28,"dark":true,"high":0,"local":"02:00","low":23,"mid":12,"precip":0.0,"rh":83,"temp":7.3,"time":"2025-07-10T23:00Z","wind":7.3},{"cloud":5,"dark":true,"high":0,"local":"03:00","low":0,"mid":5,"precip":0.0,"rh":81,"temp":7.8,"time":"2025-07-11T00:00Z","wind":8.9},{"cloud":29,"dark":false,"high":0,"local":"04:00","low":4,"mid":26,"precip":0.0,"rh":84,"temp":7.5,"time":"2025-07-11T01:00Z","wind":8.8},{"cloud":25,"dark":false,"high":0,"local":"05:00","low":11,"mid":23,"precip":0.0,"rh":86,"temp":7.1,"time":"2025-07-11T02:00Z","wind":8.4},{"cloud":25,"dark":false,"high":0,"local":"06:00","low":12,"mid":18,"precip":0.0,"rh":88,"temp":6.7,"time":"2025-07-11T03:00Z","wind":6.7}],"forecast_source":"history","forecast_updated_at":"2026-10-24T22:57:12Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-07-10T20:02:25Z","dark_hours":4.81,"dark_to":"2025-07-11T00:50:54Z","moon":{"illumination":0.998,"phase":"full moon","waxing":false},"moon_free_dark_hours":0.0,"moonrise":"2025-07-10T18:17:58Z","moonset":"2025-07-11T02:53:25Z","sunrise":"2025-07-11T02:56:40Z","sunset":"2025-07-10T17:56:40Z","twilight":{"astronomical":{"end":"2025-07-10T20:02:25Z","start":"2025-07-11T00:50:54Z"},"civil":{"end":"2025-07-10T18:30:04Z","start":"2025-07-11T02:23:16Z"},"nautical":{"end":"2025-07-10T19:12:33Z","start":"2025-07-11T01:40:46Z"}},"window_end":"2025-07-11T09:00:00Z","window_start":"2025-07-10T09:00:00Z"},"night_date":"2025-07-10","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
