{"assessment":{"best_window":{"end":"2026-05-05T23:00Z","end_local":"02:00","hours":3.75,"label":"good","mean_quality":0.85,"start":"2026-05-05T19:15Z","start_local":"22:15"},"cost":{"altitude":0.0,"clouds":0.07,"darkness":2.88,"moon":1.76},"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":10,"high":0,"iso":"2026-05-05T18:00Z","label":"poor","low":5,"mid":9,"moon_alt":-34,"precip":0.0,"q":0.13,"rh":72,"sky":"nautical twilight","temp":4.8,"time":"21:00","wind":1.6},{"alt":null,"cloud":2,"high":0,"iso":"2026-05-05T19:00Z","label":"marginal","low":0,"mid":2,"moon_alt":-24,"precip":0.0,"q":0.49,"rh":72,"sky":"astronomical twilight","temp":4.0,"time":"22:00","wind":2.8},{"alt":null,"cloud":2,"high":0,"iso":"2026-05-05T20:00Z","label":"good","low":1,"mid":2,"moon_alt":-14,"precip":0.0,"q":0.98,"rh":68,"sky":"night","temp":3.9,"time":"23:00","wind":2.7},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-05T21:00Z","label":"good","low":0,"mid":0,"moon_alt":-4,"precip":0.0,"q":1.0,"rh":69,"sky":"night","temp":3.0,"time":"00:00","wind":3.3},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-05T22:00Z","label":"good","low":0,"mid":0,"moon_alt":4,"precip":0.0,"q":0.64,"rh":70,"sky":"night","temp":2.5,"time":"01:00","wind":3.8},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-05T23:00Z","label":"marginal","low":0,"mid":0,"moon_alt":11,"precip":0.0,"q":0.6,"rh":72,"sky":"night","temp":2.1,"time":"02:00","wind":3.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T00:00Z","label":"marginal","low":0,"mid":0,"moon_alt":16,"precip":0.0,"q":0.57,"rh":72,"sky":"night","temp":1.4,"time":"03:00","wind":2.7},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T01:00Z","label":"marginal","low":0,"mid":0,"moon_alt":19,"precip":0.0,"q":0.55,"rh":73,"sky":"night","temp":0.8,"time":"04:00","wind":3.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T02:00Z","label":"poor","low":0,"mid":0,"moon_alt":19,"precip":0.0,"q":0.27,"rh":73,"sky":"astronomical twilight","temp":0.7,"time":"05:00","wind":4.4},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T03:00Z","label":"unusable","low":0,"mid":0,"moon_alt":17,"precip":0.0,"q":0.0,"rh":71,"sky":"civil twilight","temp":0.7,"time":"06:00","wind":3.5}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.19,"reasons":["daylight and twilight cost 2.9 quality-hours","moonlight cost 1.8 quality-hours"],"reference_hours":4.0,"score":99,"score_astronomy":100,"score_weather":99,"sky_hours":5.27,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-05-05T17:55Z","end_local":"20:55","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-05-05T17:20Z","start_local":"20:20"},{"end":"2026-05-05T18:35Z","end_local":"21:35","hours":0.67,"label":"poor","mean_quality":0.13,"start":"2026-05-05T17:55Z","start_local":"20:55"},{"end":"2026-05-05T19:15Z","end_local":"22:15","hours":0.67,"label":"marginal","mean_quality":0.46,"start":"2026-05-05T18:35Z","start_local":"21:35"},{"end":"2026-05-05T23:00Z","end_local":"02:00","hours":3.75,"label":"good","mean_quality":0.85,"start":"2026-05-05T19:15Z","start_local":"22:15"},{"end":"2026-05-06T01:25Z","end_local":"04:25","hours":2.42,"label":"marginal","mean_quality":0.57,"start":"2026-05-05T23:00Z","start_local":"02:00"},{"end":"2026-05-06T02:45Z","end_local":"05:45","hours":1.33,"label":"poor","mean_quality":0.18,"start":"2026-05-06T01:25Z","start_local":"04:25"},{"end":"2026-05-06T03:15Z","end_local":"06:15","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-05-06T02:45Z","start_local":"05:45"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":3,"dark":false,"high":0,"local":"20:00","low":2,"mid":2,"precip":0.0,"rh":72,"temp":6.1,"time":"2026-05-05T17:00Z","wind":3.4},{"cloud":10,"dark":false,"high":0,"local":"21:00","low":5,"mid":9,"precip":0.0,"rh":72,"temp":4.8,"time":"2026-05-05T18:00Z","wind":1.6},{"cloud":2,"dark":false,"high":0,"local":"22:00","low":0,"mid":2,"precip":0.0,"rh":72,"temp":4.0,"time":"2026-05-05T19:00Z","wind":2.8},{"cloud":2,"dark":true,"high":0,"local":"23:00","low":1,"mid":2,"precip":0.0,"rh":68,"temp":3.9,"time":"2026-05-05T20:00Z","wind":2.7},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":69,"temp":3.0,"time":"2026-05-05T21:00Z","wind":3.3},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":70,"temp":2.5,"time":"2026-05-05T22:00Z","wind":3.8},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":72,"temp":2.1,"time":"2026-05-05T23:00Z","wind":3.5},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":72,"temp":1.4,"time":"2026-05-06T00:00Z","wind":2.7},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":73,"temp":0.8,"time":"2026-05-06T01:00Z","wind":3.9},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":73,"temp":0.7,"time":"2026-05-06T02:00Z","wind":4.4},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":71,"temp":0.7,"time":"2026-05-06T03:00Z","wind":3.5},{"cloud":0,"dark":false,"high":0,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":66,"temp":2.9,"time":"2026-05-06T04:00Z","wind":2.6}],"forecast_source":"history","forecast_updated_at":"2026-10-14T07:01:23Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-05-05T19:13:31Z","dark_hours":6.13,"dark_to":"2026-05-06T01:21:28Z","moon":{"illumination":0.845,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":2.28,"moonrise":"2026-05-05T21:31:58Z","moonset":"2026-05-06T05:49:21Z","sunrise":"2026-05-06T03:11:35Z","sunset":"2026-05-05T17:23:22Z","twilight":{"astronomical":{"end":"2026-05-05T19:13:31Z","start":"2026-05-06T01:21:28Z"},"civil":{"end":"2026-05-05T17:54:06Z","start":"2026-05-06T02:40:52Z"},"nautical":{"end":"2026-05-05T18:31:56Z","start":"2026-05-06T02:03:02Z"}},"window_end":"2026-05-06T09:00:00Z","window_start":"2026-05-05T09:00:00Z"},"night_date":"2026-05-05","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
