{"assessment":{"best_window":{"end":"2025-06-06T00:40Z","end_local":"03:40","hours":0.67,"label":"good","mean_quality":0.64,"start":"2025-06-06T00:00Z","start_local":"03:00"},"cost":{"altitude":0.0,"clouds":3.18,"darkness":3.26,"moon":1.77},"formula":"astronomy = 100 * min(1, sky_hours / reference_hours) * peak_sky; overall = astronomy * score_weather / 100 (null when the weather is unknown)","hard_limit":"Overcast (\u226580 % cloud) for 5.5 of 7.7 dark hours \u2014 the sky is closed whatever the geometry says.","headline":"Barely","hourly":[{"alt":null,"cloud":100,"high":100,"iso":"2025-06-05T18:00Z","label":"unusable","low":0,"mid":12,"moon_alt":40,"precip":0.0,"q":0.0,"rh":93,"sky":"civil twilight","temp":12.7,"time":"21:00","wind":0.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-06-05T19:00Z","label":"unusable","low":1,"mid":7,"moon_alt":39,"precip":0.0,"q":0.0,"rh":91,"sky":"nautical twilight","temp":12.2,"time":"22:00","wind":0.2},{"alt":null,"cloud":100,"high":100,"iso":"2025-06-05T20:00Z","label":"unusable","low":0,"mid":3,"moon_alt":34,"precip":0.0,"q":0.0,"rh":83,"sky":"night","temp":12.8,"time":"23:00","wind":1.3},{"alt":null,"cloud":99,"high":99,"iso":"2025-06-05T21:00Z","label":"unusable","low":0,"mid":3,"moon_alt":27,"precip":0.0,"q":0.0,"rh":73,"sky":"night","temp":13.6,"time":"00:00","wind":0.8},{"alt":null,"cloud":100,"high":100,"iso":"2025-06-05T22:00Z","label":"unusable","low":0,"mid":3,"moon_alt":18,"precip":0.0,"q":0.0,"rh":70,"sky":"night","temp":13.6,"time":"01:00","wind":0.8},{"alt":null,"cloud":94,"high":94,"iso":"2025-06-05T23:00Z","label":"unusable","low":0,"mid":9,"moon_alt":8,"precip":0.0,"q":0.0,"rh":71,"sky":"night","temp":13.0,"time":"02:00","wind":0.7},{"alt":null,"cloud":32,"high":32,"iso":"2025-06-06T00:00Z","label":"good","low":0,"mid":3,"moon_alt":-3,"precip":0.0,"q":0.64,"rh":74,"sky":"night","temp":12.0,"time":"03:00","wind":0.9},{"alt":null,"cloud":31,"high":30,"iso":"2025-06-06T01:00Z","label":"marginal","low":0,"mid":1,"moon_alt":-13,"precip":0.0,"q":0.33,"rh":81,"sky":"astronomical twilight","temp":10.2,"time":"04:00","wind":2.2},{"alt":null,"cloud":52,"high":52,"iso":"2025-06-06T02:00Z","label":"poor","low":0,"mid":0,"moon_alt":-24,"precip":0.0,"q":0.06,"rh":83,"sky":"nautical twilight","temp":9.6,"time":"05:00","wind":2.1}],"peak_quality":0.64,"peak_sky":1.0,"quality_hours":0.79,"reasons":["daylight and twilight cost 3.3 quality-hours","cloud cover cost 3.2 quality-hours","moonlight cost 1.8 quality-hours"],"reference_hours":4.0,"score":20,"score_astronomy":99,"score_weather":20,"sky_hours":3.97,"verdict":"poor","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-06-06T00:00Z","end_local":"03:00","hours":6.17,"label":"unusable","mean_quality":0.0,"start":"2025-06-05T17:50Z","start_local":"20:50"},{"end":"2025-06-06T00:40Z","end_local":"03:40","hours":0.67,"label":"good","mean_quality":0.64,"start":"2025-06-06T00:00Z","start_local":"03:00"},{"end":"2025-06-06T01:35Z","end_local":"04:35","hours":0.92,"label":"marginal","mean_quality":0.33,"start":"2025-06-06T00:40Z","start_local":"03:40"},{"end":"2025-06-06T02:15Z","end_local":"05:15","hours":0.67,"label":"poor","mean_quality":0.09,"start":"2025-06-06T01:35Z","start_local":"04:35"},{"end":"2025-06-06T02:50Z","end_local":"05:50","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-06-06T02:15Z","start_local":"05:15"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":97,"dark":false,"high":97,"local":"20:00","low":0,"mid":21,"precip":0.0,"rh":93,"temp":14.6,"time":"2025-06-05T17:00Z","wind":1.3},{"cloud":100,"dark":false,"high":100,"local":"21:00","low":0,"mid":12,"precip":0.0,"rh":93,"temp":12.7,"time":"2025-06-05T18:00Z","wind":0.9},{"cloud":100,"dark":false,"high":100,"local":"22:00","low":1,"mid":7,"precip":0.0,"rh":91,"temp":12.2,"time":"2025-06-05T19:00Z","wind":0.2},{"cloud":100,"dark":true,"high":100,"local":"23:00","low":0,"mid":3,"precip":0.0,"rh":83,"temp":12.8,"time":"2025-06-05T20:00Z","wind":1.3},{"cloud":99,"dark":true,"high":99,"local":"00:00","low":0,"mid":3,"precip":0.0,"rh":73,"temp":13.6,"time":"2025-06-05T21:00Z","wind":0.8},{"cloud":100,"dark":true,"high":100,"local":"01:00","low":0,"mid":3,"precip":0.0,"rh":70,"temp":13.6,"time":"2025-06-05T22:00Z","wind":0.8},{"cloud":94,"dark":true,"high":94,"local":"02:00","low":0,"mid":9,"precip":0.0,"rh":71,"temp":13.0,"time":"2025-06-05T23:00Z","wind":0.7},{"cloud":32,"dark":true,"high":32,"local":"03:00","low":0,"mid":3,"precip":0.0,"rh":74,"temp":12.0,"time":"2025-06-06T00:00Z","wind":0.9},{"cloud":31,"dark":false,"high":30,"local":"04:00","low":0,"mid":1,"precip":0.0,"rh":81,"temp":10.2,"time":"2025-06-06T01:00Z","wind":2.2},{"cloud":52,"dark":false,"high":52,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":9.6,"time":"2025-06-06T02:00Z","wind":2.1},{"cloud":66,"dark":false,"high":66,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":10.0,"time":"2025-06-06T03:00Z","wind":2.2}],"forecast_source":"history","forecast_updated_at":"2026-10-26T02:52:57Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-06-05T19:59:58Z","dark_hours":4.65,"dark_to":"2025-06-06T00:39:14Z","moon":{"illumination":0.755,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":0.88,"moonrise":"2025-06-05T12:30:25Z","moonset":"2025-06-05T23:45:19Z","sunrise":"2025-06-06T02:47:07Z","sunset":"2025-06-05T17:52:05Z","twilight":{"astronomical":{"end":"2025-06-05T19:59:58Z","start":"2025-06-06T00:39:14Z"},"civil":{"end":"2025-06-05T18:25:48Z","start":"2025-06-06T02:13:24Z"},"nautical":{"end":"2025-06-05T19:08:54Z","start":"2025-06-06T01:30:19Z"}},"window_end":"2025-06-06T09:00:00Z","window_start":"2025-06-05T09:00:00Z"},"night_date":"2025-06-05","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
