{"assessment":{"best_window":{"end":"2025-08-06T01:30Z","end_local":"04:30","hours":0.5,"label":"good","mean_quality":1.0,"start":"2025-08-06T01:00Z","start_local":"04:00"},"cost":{"altitude":0.0,"clouds":1.64,"darkness":2.94,"moon":2.01},"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":45,"high":3,"iso":"2025-08-05T18:00Z","label":"unusable","low":2,"mid":44,"moon_alt":16,"precip":0.0,"q":0.0,"rh":66,"sky":"civil twilight","temp":13.1,"time":"21:00","wind":3.5},{"alt":null,"cloud":59,"high":7,"iso":"2025-08-05T19:00Z","label":"poor","low":21,"mid":57,"moon_alt":19,"precip":0.0,"q":0.09,"rh":58,"sky":"astronomical twilight","temp":13.8,"time":"22:00","wind":9.1},{"alt":null,"cloud":48,"high":5,"iso":"2025-08-05T20:00Z","label":"poor","low":8,"mid":42,"moon_alt":19,"precip":0.0,"q":0.25,"rh":68,"sky":"night","temp":12.7,"time":"23:00","wind":10.2},{"alt":null,"cloud":1,"high":0,"iso":"2025-08-05T21:00Z","label":"marginal","low":1,"mid":0,"moon_alt":16,"precip":0.0,"q":0.55,"rh":80,"sky":"night","temp":11.6,"time":"00:00","wind":8.5},{"alt":null,"cloud":1,"high":0,"iso":"2025-08-05T22:00Z","label":"marginal","low":1,"mid":0,"moon_alt":11,"precip":0.0,"q":0.57,"rh":88,"sky":"night","temp":10.5,"time":"01:00","wind":5.6},{"alt":null,"cloud":24,"high":24,"iso":"2025-08-05T23:00Z","label":"marginal","low":0,"mid":0,"moon_alt":5,"precip":0.0,"q":0.46,"rh":86,"sky":"night","temp":10.6,"time":"02:00","wind":7.5},{"alt":null,"cloud":70,"high":70,"iso":"2025-08-06T00:00Z","label":"poor","low":0,"mid":1,"moon_alt":-3,"precip":0.0,"q":0.22,"rh":87,"sky":"night","temp":10.4,"time":"03:00","wind":7.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-06T01:00Z","label":"good","low":0,"mid":0,"moon_alt":-13,"precip":0.0,"q":1.0,"rh":85,"sky":"night","temp":11.0,"time":"04:00","wind":8.2},{"alt":null,"cloud":7,"high":7,"iso":"2025-08-06T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-22,"precip":0.0,"q":0.46,"rh":87,"sky":"astronomical twilight","temp":10.7,"time":"05:00","wind":8.9},{"alt":null,"cloud":13,"high":13,"iso":"2025-08-06T03:00Z","label":"unusable","low":0,"mid":0,"moon_alt":-33,"precip":0.0,"q":0.0,"rh":88,"sky":"civil twilight","temp":10.3,"time":"06:00","wind":9.2}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":3.34,"reasons":["daylight and twilight cost 2.9 quality-hours","moonlight cost 2.0 quality-hours","cloud cover cost 1.6 quality-hours"],"reference_hours":4.0,"score":67,"score_astronomy":100,"score_weather":67,"sky_hours":4.97,"verdict":"marginal","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-08-05T18:05Z","end_local":"21:05","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-08-05T17:30Z","start_local":"20:30"},{"end":"2025-08-05T21:00Z","end_local":"00:00","hours":2.92,"label":"poor","mean_quality":0.16,"start":"2025-08-05T18:05Z","start_local":"21:05"},{"end":"2025-08-05T22:40Z","end_local":"01:40","hours":1.67,"label":"marginal","mean_quality":0.57,"start":"2025-08-05T21:00Z","start_local":"00:00"},{"end":"2025-08-05T23:00Z","end_local":"02:00","hours":0.33,"label":"good","mean_quality":0.61,"start":"2025-08-05T22:40Z","start_local":"01:40"},{"end":"2025-08-05T23:40Z","end_local":"02:40","hours":0.67,"label":"marginal","mean_quality":0.47,"start":"2025-08-05T23:00Z","start_local":"02:00"},{"end":"2025-08-06T00:00Z","end_local":"03:00","hours":0.33,"label":"good","mean_quality":0.73,"start":"2025-08-05T23:40Z","start_local":"02:40"},{"end":"2025-08-06T01:00Z","end_local":"04:00","hours":1.0,"label":"poor","mean_quality":0.22,"start":"2025-08-06T00:00Z","start_local":"03:00"},{"end":"2025-08-06T01:30Z","end_local":"04:30","hours":0.5,"label":"good","mean_quality":1.0,"start":"2025-08-06T01:00Z","start_local":"04:00"},{"end":"2025-08-06T02:15Z","end_local":"05:15","hours":0.75,"label":"marginal","mean_quality":0.49,"start":"2025-08-06T01:30Z","start_local":"04:30"},{"end":"2025-08-06T02:50Z","end_local":"05:50","hours":0.58,"label":"poor","mean_quality":0.14,"start":"2025-08-06T02:15Z","start_local":"05:15"},{"end":"2025-08-06T03:25Z","end_local":"06:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-08-06T02:50Z","start_local":"05:50"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":19,"dark":false,"high":3,"local":"20:00","low":3,"mid":16,"precip":0.0,"rh":59,"temp":15.5,"time":"2025-08-05T17:00Z","wind":5.1},{"cloud":45,"dark":false,"high":3,"local":"21:00","low":2,"mid":44,"precip":0.0,"rh":66,"temp":13.1,"time":"2025-08-05T18:00Z","wind":3.5},{"cloud":59,"dark":false,"high":7,"local":"22:00","low":21,"mid":57,"precip":0.0,"rh":58,"temp":13.8,"time":"2025-08-05T19:00Z","wind":9.1},{"cloud":48,"dark":true,"high":5,"local":"23:00","low":8,"mid":42,"precip":0.0,"rh":68,"temp":12.7,"time":"2025-08-05T20:00Z","wind":10.2},{"cloud":1,"dark":true,"high":0,"local":"00:00","low":1,"mid":0,"precip":0.0,"rh":80,"temp":11.6,"time":"2025-08-05T21:00Z","wind":8.5},{"cloud":1,"dark":true,"high":0,"local":"01:00","low":1,"mid":0,"precip":0.0,"rh":88,"temp":10.5,"time":"2025-08-05T22:00Z","wind":5.6},{"cloud":24,"dark":true,"high":24,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":86,"temp":10.6,"time":"2025-08-05T23:00Z","wind":7.5},{"cloud":70,"dark":true,"high":70,"local":"03:00","low":0,"mid":1,"precip":0.0,"rh":87,"temp":10.4,"time":"2025-08-06T00:00Z","wind":7.8},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":85,"temp":11.0,"time":"2025-08-06T01:00Z","wind":8.2},{"cloud":7,"dark":false,"high":7,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":87,"temp":10.7,"time":"2025-08-06T02:00Z","wind":8.9},{"cloud":13,"dark":false,"high":13,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":88,"temp":10.3,"time":"2025-08-06T03:00Z","wind":9.2},{"cloud":21,"dark":false,"high":19,"local":"07:00","low":0,"mid":15,"precip":0.0,"rh":88,"temp":10.8,"time":"2025-08-06T04:00Z","wind":10.1}],"forecast_source":"history","forecast_updated_at":"2026-10-24T09:55:44Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-08-05T19:24:42Z","dark_hours":6.08,"dark_to":"2025-08-06T01:29:43Z","moon":{"illumination":0.876,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":1.9,"moonrise":"2025-08-05T15:22:43Z","moonset":"2025-08-05T23:34:29Z","sunrise":"2025-08-06T03:20:21Z","sunset":"2025-08-05T17:34:05Z","twilight":{"astronomical":{"end":"2025-08-05T19:24:42Z","start":"2025-08-06T01:29:43Z"},"civil":{"end":"2025-08-05T18:04:54Z","start":"2025-08-06T02:49:32Z"},"nautical":{"end":"2025-08-05T18:42:53Z","start":"2025-08-06T02:11:33Z"}},"window_end":"2025-08-06T09:00:00Z","window_start":"2025-08-05T09:00:00Z"},"night_date":"2025-08-05","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}