{"assessment":{"best_window":{"end":"2026-03-06T03:20Z","end_local":"05:20","hours":5.33,"label":"marginal","mean_quality":0.39,"start":"2026-03-05T22:00Z","start_local":"00:00"},"cost":{"altitude":0.0,"clouds":2.47,"darkness":2.41,"moon":4.84},"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":100,"high":93,"iso":"2026-03-05T17:00Z","label":"unusable","low":30,"mid":99,"moon_alt":-18,"precip":0.0,"q":0.0,"rh":92,"sky":"nautical twilight","temp":-1.7,"time":"19:00","wind":5.5},{"alt":null,"cloud":98,"high":84,"iso":"2026-03-05T18:00Z","label":"unusable","low":19,"mid":97,"moon_alt":-7,"precip":0.0,"q":0.0,"rh":90,"sky":"night","temp":-2.3,"time":"20:00","wind":5.3},{"alt":null,"cloud":95,"high":0,"iso":"2026-03-05T19:00Z","label":"unusable","low":38,"mid":92,"moon_alt":3,"precip":0.0,"q":0.0,"rh":87,"sky":"night","temp":-1.6,"time":"21:00","wind":8.9},{"alt":null,"cloud":36,"high":0,"iso":"2026-03-05T20:00Z","label":"marginal","low":34,"mid":4,"moon_alt":13,"precip":0.0,"q":0.32,"rh":89,"sky":"night","temp":-1.7,"time":"22:00","wind":8.2},{"alt":null,"cloud":30,"high":0,"iso":"2026-03-05T21:00Z","label":"marginal","low":30,"mid":0,"moon_alt":22,"precip":0.0,"q":0.32,"rh":88,"sky":"night","temp":-2.0,"time":"23:00","wind":8.1},{"alt":null,"cloud":16,"high":0,"iso":"2026-03-05T22:00Z","label":"marginal","low":16,"mid":0,"moon_alt":30,"precip":0.0,"q":0.36,"rh":88,"sky":"night","temp":-2.0,"time":"00:00","wind":8.1},{"alt":null,"cloud":9,"high":0,"iso":"2026-03-05T23:00Z","label":"marginal","low":9,"mid":0,"moon_alt":36,"precip":0.0,"q":0.37,"rh":89,"sky":"night","temp":-2.4,"time":"01:00","wind":7.4},{"alt":null,"cloud":1,"high":0,"iso":"2026-03-06T00:00Z","label":"marginal","low":1,"mid":0,"moon_alt":38,"precip":0.0,"q":0.39,"rh":90,"sky":"night","temp":-3.4,"time":"02:00","wind":6.2},{"alt":null,"cloud":1,"high":0,"iso":"2026-03-06T01:00Z","label":"marginal","low":1,"mid":0,"moon_alt":38,"precip":0.0,"q":0.39,"rh":88,"sky":"night","temp":-3.1,"time":"03:00","wind":5.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-06T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":33,"precip":0.0,"q":0.42,"rh":89,"sky":"night","temp":-3.0,"time":"04:00","wind":5.7},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-06T03:00Z","label":"marginal","low":0,"mid":0,"moon_alt":26,"precip":0.0,"q":0.46,"rh":90,"sky":"night","temp":-3.1,"time":"05:00","wind":5.7},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-06T04:00Z","label":"poor","low":0,"mid":0,"moon_alt":18,"precip":0.0,"q":0.08,"rh":90,"sky":"nautical twilight","temp":-3.2,"time":"06:00","wind":4.9}],"peak_quality":0.47,"peak_sky":1.0,"quality_hours":2.87,"reasons":["moonlight cost 4.8 quality-hours","cloud cover cost 2.5 quality-hours","daylight and twilight cost 2.4 quality-hours"],"reference_hours":4.0,"score":54,"score_astronomy":100,"score_weather":54,"sky_hours":5.34,"verdict":"marginal","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-03-05T20:00Z","end_local":"22:00","hours":3.75,"label":"unusable","mean_quality":0.0,"start":"2026-03-05T16:15Z","start_local":"18:15"},{"end":"2026-03-05T20:45Z","end_local":"22:45","hours":0.75,"label":"marginal","mean_quality":0.31,"start":"2026-03-05T20:00Z","start_local":"22:00"},{"end":"2026-03-05T21:00Z","end_local":"23:00","hours":0.25,"label":"poor","mean_quality":0.3,"start":"2026-03-05T20:45Z","start_local":"22:45"},{"end":"2026-03-05T21:45Z","end_local":"23:45","hours":0.75,"label":"marginal","mean_quality":0.31,"start":"2026-03-05T21:00Z","start_local":"23:00"},{"end":"2026-03-05T22:00Z","end_local":"00:00","hours":0.25,"label":"poor","mean_quality":0.3,"start":"2026-03-05T21:45Z","start_local":"23:45"},{"end":"2026-03-06T03:20Z","end_local":"05:20","hours":5.33,"label":"marginal","mean_quality":0.39,"start":"2026-03-05T22:00Z","start_local":"00:00"},{"end":"2026-03-06T04:25Z","end_local":"06:25","hours":1.08,"label":"poor","mean_quality":0.15,"start":"2026-03-06T03:20Z","start_local":"05:20"},{"end":"2026-03-06T04:50Z","end_local":"06:50","hours":0.42,"label":"unusable","mean_quality":0.0,"start":"2026-03-06T04:25Z","start_local":"06:25"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":99,"dark":false,"high":95,"local":"18:00","low":23,"mid":99,"precip":0.0,"rh":93,"temp":-0.6,"time":"2026-03-05T16:00Z","wind":3.5},{"cloud":100,"dark":false,"high":93,"local":"19:00","low":30,"mid":99,"precip":0.0,"rh":92,"temp":-1.7,"time":"2026-03-05T17:00Z","wind":5.5},{"cloud":98,"dark":true,"high":84,"local":"20:00","low":19,"mid":97,"precip":0.0,"rh":90,"temp":-2.3,"time":"2026-03-05T18:00Z","wind":5.3},{"cloud":95,"dark":true,"high":0,"local":"21:00","low":38,"mid":92,"precip":0.0,"rh":87,"temp":-1.6,"time":"2026-03-05T19:00Z","wind":8.9},{"cloud":36,"dark":true,"high":0,"local":"22:00","low":34,"mid":4,"precip":0.0,"rh":89,"temp":-1.7,"time":"2026-03-05T20:00Z","wind":8.2},{"cloud":30,"dark":true,"high":0,"local":"23:00","low":30,"mid":0,"precip":0.0,"rh":88,"temp":-2.0,"time":"2026-03-05T21:00Z","wind":8.1},{"cloud":16,"dark":true,"high":0,"local":"00:00","low":16,"mid":0,"precip":0.0,"rh":88,"temp":-2.0,"time":"2026-03-05T22:00Z","wind":8.1},{"cloud":9,"dark":true,"high":0,"local":"01:00","low":9,"mid":0,"precip":0.0,"rh":89,"temp":-2.4,"time":"2026-03-05T23:00Z","wind":7.4},{"cloud":1,"dark":true,"high":0,"local":"02:00","low":1,"mid":0,"precip":0.0,"rh":90,"temp":-3.4,"time":"2026-03-06T00:00Z","wind":6.2},{"cloud":1,"dark":true,"high":0,"local":"03:00","low":1,"mid":0,"precip":0.0,"rh":88,"temp":-3.1,"time":"2026-03-06T01:00Z","wind":5.9},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":89,"temp":-3.0,"time":"2026-03-06T02:00Z","wind":5.7},{"cloud":0,"dark":true,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":90,"temp":-3.1,"time":"2026-03-06T03:00Z","wind":5.7},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":90,"temp":-3.2,"time":"2026-03-06T04:00Z","wind":4.9},{"cloud":0,"dark":false,"high":0,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":90,"temp":-3.5,"time":"2026-03-06T05:00Z","wind":4.6}],"forecast_source":"history","forecast_updated_at":"2026-10-16T02:46:22Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-03-05T17:48:16Z","dark_hours":9.46,"dark_to":"2026-03-06T03:15:59Z","moon":{"illumination":0.935,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":0.88,"moonrise":"2026-03-05T18:42:32Z","moonset":"2026-03-06T05:44:39Z","sunrise":"2026-03-06T04:48:08Z","sunset":"2026-03-05T16:15:57Z","twilight":{"astronomical":{"end":"2026-03-05T17:48:16Z","start":"2026-03-06T03:15:59Z"},"civil":{"end":"2026-03-05T16:43:45Z","start":"2026-03-06T04:20:24Z"},"nautical":{"end":"2026-03-05T17:15:56Z","start":"2026-03-06T03:48:16Z"}},"window_end":"2026-03-06T10:00:00Z","window_start":"2026-03-05T10:00:00Z"},"night_date":"2026-03-05","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}