{"assessment":{"best_window":{"end":"2025-10-09T17:45Z","end_local":"20:45","hours":0.33,"label":"good","mean_quality":0.61,"start":"2025-10-09T17:25Z","start_local":"20:25"},"cost":{"altitude":0.0,"clouds":0.24,"darkness":2.48,"moon":6.04},"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":"Possible, with compromises","hourly":[{"alt":null,"cloud":1,"high":0,"iso":"2025-10-09T16:00Z","label":"unusable","low":1,"mid":0,"moon_alt":-9,"precip":0.0,"q":0.0,"rh":71,"sky":"civil twilight","temp":3.7,"time":"19:00","wind":8.1},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-09T17:00Z","label":"marginal","low":0,"mid":0,"moon_alt":0,"precip":0.0,"q":0.32,"rh":74,"sky":"astronomical twilight","temp":2.6,"time":"20:00","wind":8.4},{"alt":null,"cloud":13,"high":13,"iso":"2025-10-09T18:00Z","label":"marginal","low":0,"mid":0,"moon_alt":10,"precip":0.0,"q":0.5,"rh":81,"sky":"night","temp":2.0,"time":"21:00","wind":11.5},{"alt":null,"cloud":13,"high":13,"iso":"2025-10-09T19:00Z","label":"marginal","low":0,"mid":0,"moon_alt":20,"precip":0.0,"q":0.45,"rh":83,"sky":"night","temp":1.6,"time":"22:00","wind":10.2},{"alt":null,"cloud":2,"high":2,"iso":"2025-10-09T20:00Z","label":"marginal","low":0,"mid":0,"moon_alt":31,"precip":0.0,"q":0.45,"rh":83,"sky":"night","temp":1.3,"time":"23:00","wind":8.1},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-09T21:00Z","label":"marginal","low":0,"mid":0,"moon_alt":42,"precip":0.0,"q":0.41,"rh":82,"sky":"night","temp":1.1,"time":"00:00","wind":7.9},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-09T22:00Z","label":"marginal","low":0,"mid":0,"moon_alt":53,"precip":0.0,"q":0.36,"rh":84,"sky":"night","temp":0.7,"time":"01:00","wind":6.5},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-09T23:00Z","label":"marginal","low":0,"mid":0,"moon_alt":63,"precip":0.0,"q":0.33,"rh":84,"sky":"night","temp":0.2,"time":"02:00","wind":5.7},{"alt":null,"cloud":2,"high":2,"iso":"2025-10-10T00:00Z","label":"marginal","low":0,"mid":0,"moon_alt":70,"precip":0.0,"q":0.3,"rh":84,"sky":"night","temp":-0.4,"time":"03:00","wind":6.3},{"alt":null,"cloud":16,"high":16,"iso":"2025-10-10T01:00Z","label":"poor","low":0,"mid":0,"moon_alt":72,"precip":0.0,"q":0.25,"rh":83,"sky":"night","temp":-0.2,"time":"04:00","wind":6.5},{"alt":null,"cloud":2,"high":2,"iso":"2025-10-10T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":66,"precip":0.0,"q":0.31,"rh":84,"sky":"night","temp":-0.3,"time":"05:00","wind":6.5},{"alt":null,"cloud":6,"high":4,"iso":"2025-10-10T03:00Z","label":"poor","low":2,"mid":0,"moon_alt":57,"precip":0.0,"q":0.16,"rh":84,"sky":"astronomical twilight","temp":-0.3,"time":"06:00","wind":5.8},{"alt":null,"cloud":20,"high":6,"iso":"2025-10-10T04:00Z","label":"unusable","low":15,"mid":2,"moon_alt":46,"precip":0.0,"q":0.0,"rh":85,"sky":"civil twilight","temp":-0.2,"time":"07:00","wind":5.8}],"peak_quality":0.62,"peak_sky":0.62,"quality_hours":4.0,"reasons":["moonlight cost 6.0 quality-hours","daylight and twilight cost 2.5 quality-hours"],"reference_hours":4.0,"score":58,"score_astronomy":62,"score_weather":94,"sky_hours":4.24,"verdict":"marginal","verdict_astronomy":"marginal","weather_known":true,"windows":[{"end":"2025-10-09T16:20Z","end_local":"19:20","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-10-09T15:45Z","start_local":"18:45"},{"end":"2025-10-09T16:50Z","end_local":"19:50","hours":0.5,"label":"poor","mean_quality":0.15,"start":"2025-10-09T16:20Z","start_local":"19:20"},{"end":"2025-10-09T17:25Z","end_local":"20:25","hours":0.58,"label":"marginal","mean_quality":0.37,"start":"2025-10-09T16:50Z","start_local":"19:50"},{"end":"2025-10-09T17:45Z","end_local":"20:45","hours":0.33,"label":"good","mean_quality":0.61,"start":"2025-10-09T17:25Z","start_local":"20:25"},{"end":"2025-10-10T00:20Z","end_local":"03:20","hours":6.58,"label":"marginal","mean_quality":0.4,"start":"2025-10-09T17:45Z","start_local":"20:45"},{"end":"2025-10-10T02:00Z","end_local":"05:00","hours":1.67,"label":"poor","mean_quality":0.27,"start":"2025-10-10T00:20Z","start_local":"03:20"},{"end":"2025-10-10T03:00Z","end_local":"06:00","hours":1.0,"label":"marginal","mean_quality":0.32,"start":"2025-10-10T02:00Z","start_local":"05:00"},{"end":"2025-10-10T04:00Z","end_local":"07:00","hours":1.0,"label":"poor","mean_quality":0.11,"start":"2025-10-10T03:00Z","start_local":"06:00"},{"end":"2025-10-10T04:30Z","end_local":"07:30","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-10-10T04:00Z","start_local":"07:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":21,"dark":false,"high":0,"local":"18:00","low":21,"mid":0,"precip":0.0,"rh":62,"temp":6.1,"time":"2025-10-09T15:00Z","wind":8.2},{"cloud":1,"dark":false,"high":0,"local":"19:00","low":1,"mid":0,"precip":0.0,"rh":71,"temp":3.7,"time":"2025-10-09T16:00Z","wind":8.1},{"cloud":0,"dark":false,"high":0,"local":"20:00","low":0,"mid":0,"precip":0.0,"rh":74,"temp":2.6,"time":"2025-10-09T17:00Z","wind":8.4},{"cloud":13,"dark":true,"high":13,"local":"21:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":2.0,"time":"2025-10-09T18:00Z","wind":11.5},{"cloud":13,"dark":true,"high":13,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":1.6,"time":"2025-10-09T19:00Z","wind":10.2},{"cloud":2,"dark":true,"high":2,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":1.3,"time":"2025-10-09T20:00Z","wind":8.1},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":1.1,"time":"2025-10-09T21:00Z","wind":7.9},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":0.7,"time":"2025-10-09T22:00Z","wind":6.5},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":0.2,"time":"2025-10-09T23:00Z","wind":5.7},{"cloud":2,"dark":true,"high":2,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":-0.4,"time":"2025-10-10T00:00Z","wind":6.3},{"cloud":16,"dark":true,"high":16,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":-0.2,"time":"2025-10-10T01:00Z","wind":6.5},{"cloud":2,"dark":true,"high":2,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":-0.3,"time":"2025-10-10T02:00Z","wind":6.5},{"cloud":6,"dark":false,"high":4,"local":"06:00","low":2,"mid":0,"precip":0.0,"rh":84,"temp":-0.3,"time":"2025-10-10T03:00Z","wind":5.8},{"cloud":20,"dark":false,"high":6,"local":"07:00","low":15,"mid":2,"precip":0.0,"rh":85,"temp":-0.2,"time":"2025-10-10T04:00Z","wind":5.8},{"cloud":27,"dark":false,"high":12,"local":"08:00","low":18,"mid":2,"precip":0.0,"rh":85,"temp":0.8,"time":"2025-10-10T05:00Z","wind":6.1}],"forecast_source":"history","forecast_updated_at":"2026-10-22T08:31:12Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-10-09T17:21:26Z","dark_hours":9.57,"dark_to":"2025-10-10T02:55:21Z","moon":{"illumination":0.889,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":0.0,"moonrise":"2025-10-09T16:59:49Z","moonset":"2025-10-10T08:32:56Z","sunrise":"2025-10-10T04:27:40Z","sunset":"2025-10-09T15:49:18Z","twilight":{"astronomical":{"end":"2025-10-09T17:21:26Z","start":"2025-10-10T02:55:21Z"},"civil":{"end":"2025-10-09T16:17:06Z","start":"2025-10-10T03:59:48Z"},"nautical":{"end":"2025-10-09T16:49:13Z","start":"2025-10-10T03:27:37Z"}},"window_end":"2025-10-10T09:00:00Z","window_start":"2025-10-09T09:00:00Z"},"night_date":"2025-10-09","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}