{"assessment":{"best_window":{"end":"2025-10-10T18:00Z","end_local":"21:00","hours":0.67,"label":"good","mean_quality":0.79,"start":"2025-10-10T17:20Z","start_local":"20:20"},"cost":{"altitude":0.0,"clouds":1.75,"darkness":2.42,"moon":5.09},"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":"Possible, with compromises","hourly":[{"alt":null,"cloud":13,"high":0,"iso":"2025-10-10T16:00Z","label":"unusable","low":12,"mid":2,"moon_alt":-13,"precip":0.0,"q":0.0,"rh":87,"sky":"civil twilight","temp":5.3,"time":"19:00","wind":5.7},{"alt":null,"cloud":9,"high":0,"iso":"2025-10-10T17:00Z","label":"marginal","low":9,"mid":0,"moon_alt":-6,"precip":0.0,"q":0.45,"rh":92,"sky":"astronomical twilight","temp":4.0,"time":"20:00","wind":7.3},{"alt":null,"cloud":12,"high":0,"iso":"2025-10-10T18:00Z","label":"marginal","low":12,"mid":0,"moon_alt":3,"precip":0.0,"q":0.58,"rh":96,"sky":"night","temp":3.4,"time":"21:00","wind":8.5},{"alt":null,"cloud":5,"high":0,"iso":"2025-10-10T19:00Z","label":"marginal","low":5,"mid":0,"moon_alt":12,"precip":0.0,"q":0.58,"rh":96,"sky":"night","temp":3.2,"time":"22:00","wind":8.1},{"alt":null,"cloud":2,"high":1,"iso":"2025-10-10T20:00Z","label":"marginal","low":2,"mid":0,"moon_alt":22,"precip":0.0,"q":0.54,"rh":96,"sky":"night","temp":2.9,"time":"23:00","wind":7.0},{"alt":null,"cloud":2,"high":0,"iso":"2025-10-10T21:00Z","label":"marginal","low":2,"mid":0,"moon_alt":33,"precip":0.0,"q":0.49,"rh":95,"sky":"night","temp":2.6,"time":"00:00","wind":8.5},{"alt":null,"cloud":9,"high":2,"iso":"2025-10-10T22:00Z","label":"marginal","low":7,"mid":0,"moon_alt":44,"precip":0.0,"q":0.41,"rh":94,"sky":"night","temp":2.6,"time":"01:00","wind":9.7},{"alt":null,"cloud":48,"high":38,"iso":"2025-10-10T23:00Z","label":"poor","low":13,"mid":2,"moon_alt":55,"precip":0.0,"q":0.19,"rh":93,"sky":"night","temp":2.6,"time":"02:00","wind":11.0},{"alt":null,"cloud":89,"high":77,"iso":"2025-10-11T00:00Z","label":"unusable","low":49,"mid":9,"moon_alt":65,"precip":0.0,"q":0.0,"rh":92,"sky":"night","temp":2.7,"time":"03:00","wind":14.0},{"alt":null,"cloud":100,"high":3,"iso":"2025-10-11T01:00Z","label":"unusable","low":100,"mid":2,"moon_alt":73,"precip":0.0,"q":0.0,"rh":90,"sky":"night","temp":3.0,"time":"04:00","wind":14.3},{"alt":null,"cloud":100,"high":5,"iso":"2025-10-11T02:00Z","label":"unusable","low":100,"mid":2,"moon_alt":75,"precip":0.0,"q":0.0,"rh":88,"sky":"night","temp":3.4,"time":"05:00","wind":15.8},{"alt":null,"cloud":100,"high":16,"iso":"2025-10-11T03:00Z","label":"unusable","low":100,"mid":8,"moon_alt":69,"precip":0.0,"q":0.0,"rh":88,"sky":"astronomical twilight","temp":3.5,"time":"06:00","wind":16.3},{"alt":null,"cloud":100,"high":64,"iso":"2025-10-11T04:00Z","label":"unusable","low":100,"mid":4,"moon_alt":59,"precip":0.0,"q":0.0,"rh":88,"sky":"nautical twilight","temp":3.4,"time":"07:00","wind":15.5}],"peak_quality":0.9,"peak_sky":1.0,"quality_hours":3.5,"reasons":["moonlight cost 5.1 quality-hours","daylight and twilight cost 2.4 quality-hours","cloud cover cost 1.7 quality-hours"],"reference_hours":4.0,"score":67,"score_astronomy":100,"score_weather":67,"sky_hours":5.24,"verdict":"marginal","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-10-10T16:20Z","end_local":"19:20","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-10-10T15:45Z","start_local":"18:45"},{"end":"2025-10-10T16:50Z","end_local":"19:50","hours":0.5,"label":"poor","mean_quality":0.13,"start":"2025-10-10T16:20Z","start_local":"19:20"},{"end":"2025-10-10T17:20Z","end_local":"20:20","hours":0.5,"label":"marginal","mean_quality":0.44,"start":"2025-10-10T16:50Z","start_local":"19:50"},{"end":"2025-10-10T18:00Z","end_local":"21:00","hours":0.67,"label":"good","mean_quality":0.79,"start":"2025-10-10T17:20Z","start_local":"20:20"},{"end":"2025-10-10T23:00Z","end_local":"02:00","hours":5.0,"label":"marginal","mean_quality":0.5,"start":"2025-10-10T18:00Z","start_local":"21:00"},{"end":"2025-10-11T00:00Z","end_local":"03:00","hours":1.0,"label":"poor","mean_quality":0.19,"start":"2025-10-10T23:00Z","start_local":"02:00"},{"end":"2025-10-11T04:30Z","end_local":"07:30","hours":4.5,"label":"unusable","mean_quality":0.0,"start":"2025-10-11T00:00Z","start_local":"03:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":36,"dark":false,"high":0,"local":"18:00","low":30,"mid":27,"precip":0.0,"rh":73,"temp":7.8,"time":"2025-10-10T15:00Z","wind":6.6},{"cloud":13,"dark":false,"high":0,"local":"19:00","low":12,"mid":2,"precip":0.0,"rh":87,"temp":5.3,"time":"2025-10-10T16:00Z","wind":5.7},{"cloud":9,"dark":false,"high":0,"local":"20:00","low":9,"mid":0,"precip":0.0,"rh":92,"temp":4.0,"time":"2025-10-10T17:00Z","wind":7.3},{"cloud":12,"dark":true,"high":0,"local":"21:00","low":12,"mid":0,"precip":0.0,"rh":96,"temp":3.4,"time":"2025-10-10T18:00Z","wind":8.5},{"cloud":5,"dark":true,"high":0,"local":"22:00","low":5,"mid":0,"precip":0.0,"rh":96,"temp":3.2,"time":"2025-10-10T19:00Z","wind":8.1},{"cloud":2,"dark":true,"high":1,"local":"23:00","low":2,"mid":0,"precip":0.0,"rh":96,"temp":2.9,"time":"2025-10-10T20:00Z","wind":7.0},{"cloud":2,"dark":true,"high":0,"local":"00:00","low":2,"mid":0,"precip":0.0,"rh":95,"temp":2.6,"time":"2025-10-10T21:00Z","wind":8.5},{"cloud":9,"dark":true,"high":2,"local":"01:00","low":7,"mid":0,"precip":0.0,"rh":94,"temp":2.6,"time":"2025-10-10T22:00Z","wind":9.7},{"cloud":48,"dark":true,"high":38,"local":"02:00","low":13,"mid":2,"precip":0.0,"rh":93,"temp":2.6,"time":"2025-10-10T23:00Z","wind":11.0},{"cloud":89,"dark":true,"high":77,"local":"03:00","low":49,"mid":9,"precip":0.0,"rh":92,"temp":2.7,"time":"2025-10-11T00:00Z","wind":14.0},{"cloud":100,"dark":true,"high":3,"local":"04:00","low":100,"mid":2,"precip":0.0,"rh":90,"temp":3.0,"time":"2025-10-11T01:00Z","wind":14.3},{"cloud":100,"dark":true,"high":5,"local":"05:00","low":100,"mid":2,"precip":0.0,"rh":88,"temp":3.4,"time":"2025-10-11T02:00Z","wind":15.8},{"cloud":100,"dark":false,"high":16,"local":"06:00","low":100,"mid":8,"precip":0.0,"rh":88,"temp":3.5,"time":"2025-10-11T03:00Z","wind":16.3},{"cloud":100,"dark":false,"high":64,"local":"07:00","low":100,"mid":4,"precip":0.0,"rh":88,"temp":3.4,"time":"2025-10-11T04:00Z","wind":15.5},{"cloud":100,"dark":false,"high":33,"local":"08:00","low":100,"mid":1,"precip":0.0,"rh":86,"temp":3.6,"time":"2025-10-11T05:00Z","wind":15.2}],"forecast_source":"history","forecast_updated_at":"2026-10-22T07:43:52Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-10-10T17:19:49Z","dark_hours":9.61,"dark_to":"2025-10-11T02:56:27Z","moon":{"illumination":0.803,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":0.38,"moonrise":"2025-10-10T17:43:39Z","moonset":null,"sunrise":"2025-10-11T04:28:46Z","sunset":"2025-10-10T15:47:40Z","twilight":{"astronomical":{"end":"2025-10-10T17:19:49Z","start":"2025-10-11T02:56:27Z"},"civil":{"end":"2025-10-10T16:15:29Z","start":"2025-10-11T04:00:53Z"},"nautical":{"end":"2025-10-10T16:47:37Z","start":"2025-10-11T03:28:42Z"}},"window_end":"2025-10-11T09:00:00Z","window_start":"2025-10-10T09:00:00Z"},"night_date":"2025-10-10","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
