{"assessment":{"best_window":{"end":"2025-10-05T02:50Z","end_local":"05:50","hours":1.25,"label":"good","mean_quality":0.87,"start":"2025-10-05T01:35Z","start_local":"04:35"},"cost":{"altitude":0.0,"clouds":0.2,"darkness":2.48,"moon":4.8},"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":45,"high":0,"iso":"2025-10-04T16:00Z","label":"unusable","low":45,"mid":0,"moon_alt":13,"precip":0.0,"q":0.0,"rh":80,"sky":"civil twilight","temp":2.5,"time":"19:00","wind":3.5},{"alt":null,"cloud":15,"high":0,"iso":"2025-10-04T17:00Z","label":"poor","low":13,"mid":1,"moon_alt":22,"precip":0.0,"q":0.2,"rh":87,"sky":"astronomical twilight","temp":0.9,"time":"20:00","wind":3.2},{"alt":null,"cloud":2,"high":0,"iso":"2025-10-04T18:00Z","label":"marginal","low":1,"mid":2,"moon_alt":30,"precip":0.0,"q":0.43,"rh":90,"sky":"night","temp":-0.2,"time":"21:00","wind":4.0},{"alt":null,"cloud":16,"high":0,"iso":"2025-10-04T19:00Z","label":"marginal","low":0,"mid":16,"moon_alt":36,"precip":0.0,"q":0.33,"rh":93,"sky":"night","temp":-0.7,"time":"22:00","wind":4.4},{"alt":null,"cloud":11,"high":0,"iso":"2025-10-04T20:00Z","label":"marginal","low":0,"mid":11,"moon_alt":39,"precip":0.0,"q":0.34,"rh":95,"sky":"night","temp":-1.2,"time":"23:00","wind":4.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-04T21:00Z","label":"marginal","low":0,"mid":0,"moon_alt":38,"precip":0.0,"q":0.4,"rh":93,"sky":"night","temp":-1.2,"time":"00:00","wind":5.3},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-04T22:00Z","label":"marginal","low":0,"mid":0,"moon_alt":35,"precip":0.0,"q":0.42,"rh":90,"sky":"night","temp":-1.4,"time":"01:00","wind":4.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-04T23:00Z","label":"marginal","low":0,"mid":0,"moon_alt":28,"precip":0.0,"q":0.45,"rh":87,"sky":"night","temp":-1.4,"time":"02:00","wind":5.1},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-05T00:00Z","label":"marginal","low":0,"mid":0,"moon_alt":19,"precip":0.0,"q":0.5,"rh":88,"sky":"night","temp":-1.9,"time":"03:00","wind":5.6},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-05T01:00Z","label":"marginal","low":0,"mid":0,"moon_alt":10,"precip":0.0,"q":0.56,"rh":84,"sky":"night","temp":-1.5,"time":"04:00","wind":6.0},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-05T02:00Z","label":"good","low":0,"mid":0,"moon_alt":-1,"precip":0.0,"q":1.0,"rh":84,"sky":"night","temp":-1.6,"time":"05:00","wind":6.1},{"alt":null,"cloud":0,"high":0,"iso":"2025-10-05T03:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-11,"precip":0.0,"q":0.5,"rh":84,"sky":"astronomical twilight","temp":-1.7,"time":"06:00","wind":6.0},{"alt":null,"cloud":1,"high":0,"iso":"2025-10-05T04:00Z","label":"unusable","low":0,"mid":1,"moon_alt":-22,"precip":0.0,"q":0.0,"rh":84,"sky":"civil twilight","temp":-1.8,"time":"07:00","wind":5.7}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.03,"reasons":["moonlight cost 4.8 quality-hours","daylight and twilight cost 2.5 quality-hours"],"reference_hours":4.0,"score":96,"score_astronomy":100,"score_weather":96,"sky_hours":5.23,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-10-04T16:30Z","end_local":"19:30","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-10-04T15:55Z","start_local":"18:55"},{"end":"2025-10-04T17:30Z","end_local":"20:30","hours":1.0,"label":"poor","mean_quality":0.12,"start":"2025-10-04T16:30Z","start_local":"19:30"},{"end":"2025-10-05T01:35Z","end_local":"04:35","hours":8.08,"label":"marginal","mean_quality":0.43,"start":"2025-10-04T17:30Z","start_local":"20:30"},{"end":"2025-10-05T02:50Z","end_local":"05:50","hours":1.25,"label":"good","mean_quality":0.87,"start":"2025-10-05T01:35Z","start_local":"04:35"},{"end":"2025-10-05T03:25Z","end_local":"06:25","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2025-10-05T02:50Z","start_local":"05:50"},{"end":"2025-10-05T03:55Z","end_local":"06:55","hours":0.5,"label":"poor","mean_quality":0.15,"start":"2025-10-05T03:25Z","start_local":"06:25"},{"end":"2025-10-05T04:25Z","end_local":"07:25","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-10-05T03:55Z","start_local":"06:55"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":58,"dark":false,"high":0,"local":"18:00","low":58,"mid":0,"precip":0.1,"rh":68,"temp":4.5,"time":"2025-10-04T15:00Z","wind":6.6},{"cloud":45,"dark":false,"high":0,"local":"19:00","low":45,"mid":0,"precip":0.0,"rh":80,"temp":2.5,"time":"2025-10-04T16:00Z","wind":3.5},{"cloud":15,"dark":false,"high":0,"local":"20:00","low":13,"mid":1,"precip":0.0,"rh":87,"temp":0.9,"time":"2025-10-04T17:00Z","wind":3.2},{"cloud":2,"dark":true,"high":0,"local":"21:00","low":1,"mid":2,"precip":0.0,"rh":90,"temp":-0.2,"time":"2025-10-04T18:00Z","wind":4.0},{"cloud":16,"dark":true,"high":0,"local":"22:00","low":0,"mid":16,"precip":0.0,"rh":93,"temp":-0.7,"time":"2025-10-04T19:00Z","wind":4.4},{"cloud":11,"dark":true,"high":0,"local":"23:00","low":0,"mid":11,"precip":0.0,"rh":95,"temp":-1.2,"time":"2025-10-04T20:00Z","wind":4.8},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":93,"temp":-1.2,"time":"2025-10-04T21:00Z","wind":5.3},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":90,"temp":-1.4,"time":"2025-10-04T22:00Z","wind":4.8},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":87,"temp":-1.4,"time":"2025-10-04T23:00Z","wind":5.1},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":88,"temp":-1.9,"time":"2025-10-05T00:00Z","wind":5.6},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":-1.5,"time":"2025-10-05T01:00Z","wind":6.0},{"cloud":0,"dark":true,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":-1.6,"time":"2025-10-05T02:00Z","wind":6.1},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":-1.7,"time":"2025-10-05T03:00Z","wind":6.0},{"cloud":1,"dark":false,"high":0,"local":"07:00","low":0,"mid":1,"precip":0.0,"rh":84,"temp":-1.8,"time":"2025-10-05T04:00Z","wind":5.7},{"cloud":1,"dark":false,"high":0,"local":"08:00","low":0,"mid":1,"precip":0.0,"rh":81,"temp":-0.8,"time":"2025-10-05T05:00Z","wind":5.0}],"forecast_source":"history","forecast_updated_at":"2026-10-22T07:02:01Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-10-04T17:29:48Z","dark_hours":9.33,"dark_to":"2025-10-05T02:49:50Z","moon":{"illumination":0.932,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":0.87,"moonrise":"2025-10-04T14:45:34Z","moonset":"2025-10-05T01:56:05Z","sunrise":"2025-10-05T04:22:12Z","sunset":"2025-10-04T15:57:36Z","twilight":{"astronomical":{"end":"2025-10-04T17:29:48Z","start":"2025-10-05T02:49:50Z"},"civil":{"end":"2025-10-04T16:25:18Z","start":"2025-10-05T03:54:27Z"},"nautical":{"end":"2025-10-04T16:57:26Z","start":"2025-10-05T03:22:16Z"}},"window_end":"2025-10-05T09:00:00Z","window_start":"2025-10-04T09:00:00Z"},"night_date":"2025-10-04","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}