{"assessment":{"best_window":null,"cost":{"altitude":0.0,"clouds":5.7,"darkness":2.52,"moon":5.78},"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 12.9 of 12.9 dark hours \u2014 the sky is closed whatever the geometry says.","headline":"Not tonight","hourly":[{"alt":null,"cloud":100,"high":100,"iso":"2025-11-08T16:00Z","label":"unusable","low":100,"mid":53,"moon_alt":-11,"precip":0.2,"q":0.0,"rh":100,"sky":"nautical twilight","temp":5.3,"time":"18:00","wind":10.1},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-08T17:00Z","label":"unusable","low":86,"mid":63,"moon_alt":-4,"precip":0.1,"q":0.0,"rh":100,"sky":"night","temp":5.5,"time":"19:00","wind":9.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-08T18:00Z","label":"unusable","low":100,"mid":31,"moon_alt":5,"precip":0.0,"q":0.0,"rh":98,"sky":"night","temp":5.6,"time":"20:00","wind":6.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-08T19:00Z","label":"unusable","low":100,"mid":23,"moon_alt":14,"precip":0.1,"q":0.0,"rh":100,"sky":"night","temp":5.4,"time":"21:00","wind":3.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-08T20:00Z","label":"unusable","low":100,"mid":45,"moon_alt":24,"precip":0.1,"q":0.0,"rh":99,"sky":"night","temp":5.2,"time":"22:00","wind":3.8},{"alt":null,"cloud":100,"high":99,"iso":"2025-11-08T21:00Z","label":"unusable","low":100,"mid":1,"moon_alt":35,"precip":0.0,"q":0.0,"rh":99,"sky":"night","temp":5.1,"time":"23:00","wind":3.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-08T22:00Z","label":"unusable","low":100,"mid":1,"moon_alt":46,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":4.2,"time":"00:00","wind":4.4},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-08T23:00Z","label":"unusable","low":100,"mid":15,"moon_alt":56,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":3.9,"time":"01:00","wind":4.1},{"alt":null,"cloud":100,"high":98,"iso":"2025-11-09T00:00Z","label":"unusable","low":100,"mid":31,"moon_alt":67,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":3.0,"time":"02:00","wind":4.3},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-09T01:00Z","label":"unusable","low":100,"mid":32,"moon_alt":74,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":1.8,"time":"03:00","wind":5.1},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-09T02:00Z","label":"unusable","low":98,"mid":41,"moon_alt":75,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":1.5,"time":"04:00","wind":4.8},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-09T03:00Z","label":"unusable","low":98,"mid":40,"moon_alt":68,"precip":0.0,"q":0.0,"rh":100,"sky":"night","temp":1.5,"time":"05:00","wind":4.5},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-09T04:00Z","label":"unusable","low":97,"mid":99,"moon_alt":58,"precip":0.0,"q":0.0,"rh":100,"sky":"astronomical twilight","temp":1.1,"time":"06:00","wind":4.3},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-09T05:00Z","label":"unusable","low":9,"mid":100,"moon_alt":48,"precip":0.0,"q":0.0,"rh":97,"sky":"civil twilight","temp":1.6,"time":"07:00","wind":4.4}],"peak_quality":0.0,"peak_sky":1.0,"quality_hours":0.0,"reasons":["moonlight cost 5.8 quality-hours","cloud cover cost 5.7 quality-hours","daylight and twilight cost 2.5 quality-hours"],"reference_hours":4.0,"score":0,"score_astronomy":100,"score_weather":0,"sky_hours":5.7,"verdict":"unusable","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-11-09T05:05Z","end_local":"07:05","hours":14.0,"label":"unusable","mean_quality":0.0,"start":"2025-11-08T15:05Z","start_local":"17:05"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":100,"dark":false,"high":98,"local":"17:00","low":100,"mid":64,"precip":0.9,"rh":100,"temp":5.3,"time":"2025-11-08T15:00Z","wind":10.7},{"cloud":100,"dark":false,"high":100,"local":"18:00","low":100,"mid":53,"precip":0.2,"rh":100,"temp":5.3,"time":"2025-11-08T16:00Z","wind":10.1},{"cloud":100,"dark":true,"high":99,"local":"19:00","low":86,"mid":63,"precip":0.1,"rh":100,"temp":5.5,"time":"2025-11-08T17:00Z","wind":9.9},{"cloud":100,"dark":true,"high":100,"local":"20:00","low":100,"mid":31,"precip":0.0,"rh":98,"temp":5.6,"time":"2025-11-08T18:00Z","wind":6.9},{"cloud":100,"dark":true,"high":100,"local":"21:00","low":100,"mid":23,"precip":0.1,"rh":100,"temp":5.4,"time":"2025-11-08T19:00Z","wind":3.9},{"cloud":100,"dark":true,"high":100,"local":"22:00","low":100,"mid":45,"precip":0.1,"rh":99,"temp":5.2,"time":"2025-11-08T20:00Z","wind":3.8},{"cloud":100,"dark":true,"high":99,"local":"23:00","low":100,"mid":1,"precip":0.0,"rh":99,"temp":5.1,"time":"2025-11-08T21:00Z","wind":3.7},{"cloud":100,"dark":true,"high":100,"local":"00:00","low":100,"mid":1,"precip":0.0,"rh":100,"temp":4.2,"time":"2025-11-08T22:00Z","wind":4.4},{"cloud":100,"dark":true,"high":100,"local":"01:00","low":100,"mid":15,"precip":0.0,"rh":100,"temp":3.9,"time":"2025-11-08T23:00Z","wind":4.1},{"cloud":100,"dark":true,"high":98,"local":"02:00","low":100,"mid":31,"precip":0.0,"rh":100,"temp":3.0,"time":"2025-11-09T00:00Z","wind":4.3},{"cloud":100,"dark":true,"high":100,"local":"03:00","low":100,"mid":32,"precip":0.0,"rh":100,"temp":1.8,"time":"2025-11-09T01:00Z","wind":5.1},{"cloud":100,"dark":true,"high":100,"local":"04:00","low":98,"mid":41,"precip":0.0,"rh":100,"temp":1.5,"time":"2025-11-09T02:00Z","wind":4.8},{"cloud":100,"dark":true,"high":100,"local":"05:00","low":98,"mid":40,"precip":0.0,"rh":100,"temp":1.5,"time":"2025-11-09T03:00Z","wind":4.5},{"cloud":100,"dark":false,"high":100,"local":"06:00","low":97,"mid":99,"precip":0.0,"rh":100,"temp":1.1,"time":"2025-11-09T04:00Z","wind":4.3},{"cloud":100,"dark":false,"high":100,"local":"07:00","low":9,"mid":100,"precip":0.0,"rh":97,"temp":1.6,"time":"2025-11-09T05:00Z","wind":4.4},{"cloud":100,"dark":false,"high":92,"local":"08:00","low":0,"mid":100,"precip":0.0,"rh":89,"temp":3.7,"time":"2025-11-09T06:00Z","wind":5.9}],"forecast_source":"history","forecast_updated_at":"2026-10-19T16:04:35Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-11-08T16:42:29Z","dark_hours":10.75,"dark_to":"2025-11-09T03:27:37Z","moon":{"illumination":0.837,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":0.73,"moonrise":"2025-11-08T17:27:24Z","moonset":"2025-11-09T09:39:58Z","sunrise":"2025-11-09T05:02:56Z","sunset":"2025-11-08T15:07:23Z","twilight":{"astronomical":{"end":"2025-11-08T16:42:29Z","start":"2025-11-09T03:27:37Z"},"civil":{"end":"2025-11-08T15:36:45Z","start":"2025-11-09T04:33:30Z"},"nautical":{"end":"2025-11-08T16:09:56Z","start":"2025-11-09T04:00:14Z"}},"window_end":"2025-11-09T10:00:00Z","window_start":"2025-11-08T10:00:00Z"},"night_date":"2025-11-08","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
