{"assessment":{"best_window":{"end":"2026-05-14T23:00Z","end_local":"02:00","hours":3.5,"label":"good","mean_quality":0.93,"start":"2026-05-14T19:30Z","start_local":"22:30"},"cost":{"altitude":0.0,"clouds":1.84,"darkness":2.98,"moon":0.0},"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":23,"high":0,"iso":"2026-05-14T18:00Z","label":"unusable","low":23,"mid":0,"moon_alt":-28,"precip":0.0,"q":0.0,"rh":92,"sky":"civil twilight","temp":3.2,"time":"21:00","wind":3.3},{"alt":null,"cloud":9,"high":0,"iso":"2026-05-14T19:00Z","label":"marginal","low":8,"mid":1,"moon_alt":-33,"precip":0.0,"q":0.45,"rh":93,"sky":"astronomical twilight","temp":2.6,"time":"22:00","wind":4.7},{"alt":null,"cloud":2,"high":0,"iso":"2026-05-14T20:00Z","label":"good","low":2,"mid":0,"moon_alt":-35,"precip":0.0,"q":0.98,"rh":92,"sky":"night","temp":2.2,"time":"23:00","wind":4.8},{"alt":null,"cloud":1,"high":0,"iso":"2026-05-14T21:00Z","label":"good","low":1,"mid":0,"moon_alt":-35,"precip":0.0,"q":0.99,"rh":92,"sky":"night","temp":1.7,"time":"00:00","wind":4.6},{"alt":null,"cloud":16,"high":0,"iso":"2026-05-14T22:00Z","label":"good","low":16,"mid":0,"moon_alt":-31,"precip":0.0,"q":0.82,"rh":94,"sky":"night","temp":1.1,"time":"01:00","wind":4.7},{"alt":null,"cloud":38,"high":0,"iso":"2026-05-14T23:00Z","label":"marginal","low":38,"mid":0,"moon_alt":-25,"precip":0.0,"q":0.58,"rh":96,"sky":"night","temp":0.8,"time":"02:00","wind":4.8},{"alt":null,"cloud":40,"high":0,"iso":"2026-05-15T00:00Z","label":"marginal","low":40,"mid":0,"moon_alt":-17,"precip":0.0,"q":0.56,"rh":100,"sky":"night","temp":0.2,"time":"03:00","wind":4.6},{"alt":null,"cloud":99,"high":8,"iso":"2026-05-15T01:00Z","label":"unusable","low":99,"mid":0,"moon_alt":-7,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":0.1,"time":"04:00","wind":5.9},{"alt":null,"cloud":92,"high":48,"iso":"2026-05-15T02:00Z","label":"unusable","low":84,"mid":0,"moon_alt":3,"precip":0.0,"q":0.0,"rh":99,"sky":"nautical twilight","temp":1.1,"time":"05:00","wind":7.0},{"alt":null,"cloud":84,"high":48,"iso":"2026-05-15T03:00Z","label":"unusable","low":69,"mid":3,"moon_alt":14,"precip":0.0,"q":0.0,"rh":99,"sky":"civil twilight","temp":0.7,"time":"06:00","wind":5.6}],"peak_quality":0.99,"peak_sky":1.0,"quality_hours":4.76,"reasons":["daylight and twilight cost 3.0 quality-hours","cloud cover cost 1.8 quality-hours"],"reference_hours":4.0,"score":72,"score_astronomy":100,"score_weather":72,"sky_hours":6.6,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-05-14T18:05Z","end_local":"21:05","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-05-14T17:30Z","start_local":"20:30"},{"end":"2026-05-14T18:45Z","end_local":"21:45","hours":0.67,"label":"poor","mean_quality":0.11,"start":"2026-05-14T18:05Z","start_local":"21:05"},{"end":"2026-05-14T19:30Z","end_local":"22:30","hours":0.75,"label":"marginal","mean_quality":0.42,"start":"2026-05-14T18:45Z","start_local":"21:45"},{"end":"2026-05-14T23:00Z","end_local":"02:00","hours":3.5,"label":"good","mean_quality":0.93,"start":"2026-05-14T19:30Z","start_local":"22:30"},{"end":"2026-05-15T01:00Z","end_local":"04:00","hours":2.0,"label":"marginal","mean_quality":0.57,"start":"2026-05-14T23:00Z","start_local":"02:00"},{"end":"2026-05-15T03:05Z","end_local":"06:05","hours":2.08,"label":"unusable","mean_quality":0.0,"start":"2026-05-15T01:00Z","start_local":"04:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":13,"dark":false,"high":0,"local":"20:00","low":13,"mid":0,"precip":0.0,"rh":80,"temp":5.1,"time":"2026-05-14T17:00Z","wind":4.9},{"cloud":23,"dark":false,"high":0,"local":"21:00","low":23,"mid":0,"precip":0.0,"rh":92,"temp":3.2,"time":"2026-05-14T18:00Z","wind":3.3},{"cloud":9,"dark":false,"high":0,"local":"22:00","low":8,"mid":1,"precip":0.0,"rh":93,"temp":2.6,"time":"2026-05-14T19:00Z","wind":4.7},{"cloud":2,"dark":true,"high":0,"local":"23:00","low":2,"mid":0,"precip":0.0,"rh":92,"temp":2.2,"time":"2026-05-14T20:00Z","wind":4.8},{"cloud":1,"dark":true,"high":0,"local":"00:00","low":1,"mid":0,"precip":0.0,"rh":92,"temp":1.7,"time":"2026-05-14T21:00Z","wind":4.6},{"cloud":16,"dark":true,"high":0,"local":"01:00","low":16,"mid":0,"precip":0.0,"rh":94,"temp":1.1,"time":"2026-05-14T22:00Z","wind":4.7},{"cloud":38,"dark":true,"high":0,"local":"02:00","low":38,"mid":0,"precip":0.0,"rh":96,"temp":0.8,"time":"2026-05-14T23:00Z","wind":4.8},{"cloud":40,"dark":true,"high":0,"local":"03:00","low":40,"mid":0,"precip":0.0,"rh":100,"temp":0.2,"time":"2026-05-15T00:00Z","wind":4.6},{"cloud":99,"dark":true,"high":8,"local":"04:00","low":99,"mid":0,"precip":0.0,"rh":100,"temp":0.1,"time":"2026-05-15T01:00Z","wind":5.9},{"cloud":92,"dark":false,"high":48,"local":"05:00","low":84,"mid":0,"precip":0.0,"rh":99,"temp":1.1,"time":"2026-05-15T02:00Z","wind":7.0},{"cloud":84,"dark":false,"high":48,"local":"06:00","low":69,"mid":3,"precip":0.0,"rh":99,"temp":0.7,"time":"2026-05-15T03:00Z","wind":5.6},{"cloud":99,"dark":false,"high":49,"local":"07:00","low":98,"mid":8,"precip":0.0,"rh":99,"temp":1.3,"time":"2026-05-15T04:00Z","wind":6.3}],"forecast_source":"history","forecast_updated_at":"2026-10-13T18:24:22Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-05-14T19:28:18Z","dark_hours":5.63,"dark_to":"2026-05-15T01:06:08Z","moon":{"illumination":0.054,"phase":"waning crescent","waxing":false},"moon_free_dark_hours":5.62,"moonrise":"2026-05-15T01:44:09Z","moonset":"2026-05-14T14:49:25Z","sunrise":"2026-05-15T03:01:37Z","sunset":"2026-05-14T17:32:47Z","twilight":{"astronomical":{"end":"2026-05-14T19:28:18Z","start":"2026-05-15T01:06:08Z"},"civil":{"end":"2026-05-14T18:04:29Z","start":"2026-05-15T02:29:56Z"},"nautical":{"end":"2026-05-14T18:43:57Z","start":"2026-05-15T01:50:28Z"}},"window_end":"2026-05-15T09:00:00Z","window_start":"2026-05-14T09:00:00Z"},"night_date":"2026-05-14","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
