{"assessment":{"best_window":{"end":"2025-07-18T00:00Z","end_local":"03:00","hours":2.0,"label":"good","mean_quality":0.66,"start":"2025-07-17T22:00Z","start_local":"01:00"},"cost":{"altitude":0.0,"clouds":2.59,"darkness":3.13,"moon":1.17},"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":11,"high":11,"iso":"2025-07-17T18:00Z","label":"unusable","low":0,"mid":1,"moon_alt":-31,"precip":0.0,"q":0.0,"rh":70,"sky":"civil twilight","temp":15.4,"time":"21:00","wind":4.4},{"alt":null,"cloud":100,"high":100,"iso":"2025-07-17T19:00Z","label":"unusable","low":50,"mid":33,"moon_alt":-23,"precip":0.9,"q":0.0,"rh":80,"sky":"nautical twilight","temp":13.8,"time":"22:00","wind":8.5},{"alt":null,"cloud":100,"high":100,"iso":"2025-07-17T20:00Z","label":"unusable","low":0,"mid":81,"moon_alt":-14,"precip":2.8,"q":0.0,"rh":97,"sky":"night","temp":12.9,"time":"23:00","wind":3.2},{"alt":null,"cloud":27,"high":23,"iso":"2025-07-17T21:00Z","label":"good","low":0,"mid":5,"moon_alt":-4,"precip":0.8,"q":0.7,"rh":96,"sky":"night","temp":12.6,"time":"00:00","wind":5.0},{"alt":null,"cloud":10,"high":0,"iso":"2025-07-17T22:00Z","label":"good","low":0,"mid":10,"moon_alt":7,"precip":0.0,"q":0.69,"rh":98,"sky":"night","temp":11.3,"time":"01:00","wind":3.2},{"alt":null,"cloud":8,"high":0,"iso":"2025-07-17T23:00Z","label":"good","low":1,"mid":8,"moon_alt":18,"precip":0.0,"q":0.67,"rh":100,"sky":"night","temp":10.7,"time":"02:00","wind":3.1},{"alt":null,"cloud":43,"high":17,"iso":"2025-07-18T00:00Z","label":"marginal","low":31,"mid":7,"moon_alt":29,"precip":0.0,"q":0.36,"rh":99,"sky":"night","temp":10.3,"time":"03:00","wind":4.3},{"alt":null,"cloud":99,"high":4,"iso":"2025-07-18T01:00Z","label":"unusable","low":99,"mid":1,"moon_alt":39,"precip":0.0,"q":0.0,"rh":97,"sky":"night","temp":10.7,"time":"04:00","wind":7.1},{"alt":null,"cloud":84,"high":1,"iso":"2025-07-18T02:00Z","label":"unusable","low":83,"mid":5,"moon_alt":49,"precip":0.0,"q":0.0,"rh":98,"sky":"nautical twilight","temp":9.6,"time":"05:00","wind":7.3},{"alt":null,"cloud":69,"high":62,"iso":"2025-07-18T03:00Z","label":"unusable","low":18,"mid":1,"moon_alt":57,"precip":0.0,"q":0.0,"rh":98,"sky":"civil twilight","temp":8.9,"time":"06:00","wind":6.9}],"peak_quality":0.7,"peak_sky":1.0,"quality_hours":2.36,"reasons":["daylight and twilight cost 3.1 quality-hours","cloud cover cost 2.6 quality-hours","moonlight cost 1.2 quality-hours"],"reference_hours":4.0,"score":48,"score_astronomy":100,"score_weather":48,"sky_hours":4.95,"verdict":"marginal","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-07-17T18:30Z","end_local":"21:30","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2025-07-17T17:50Z","start_local":"20:50"},{"end":"2025-07-17T19:00Z","end_local":"22:00","hours":0.5,"label":"poor","mean_quality":0.13,"start":"2025-07-17T18:30Z","start_local":"21:30"},{"end":"2025-07-17T21:00Z","end_local":"00:00","hours":2.0,"label":"unusable","mean_quality":0.0,"start":"2025-07-17T19:00Z","start_local":"22:00"},{"end":"2025-07-17T21:25Z","end_local":"00:25","hours":0.42,"label":"good","mean_quality":0.7,"start":"2025-07-17T21:00Z","start_local":"00:00"},{"end":"2025-07-17T22:00Z","end_local":"01:00","hours":0.58,"label":"marginal","mean_quality":0.55,"start":"2025-07-17T21:25Z","start_local":"00:25"},{"end":"2025-07-18T00:00Z","end_local":"03:00","hours":2.0,"label":"good","mean_quality":0.66,"start":"2025-07-17T22:00Z","start_local":"01:00"},{"end":"2025-07-18T01:00Z","end_local":"04:00","hours":1.0,"label":"marginal","mean_quality":0.36,"start":"2025-07-18T00:00Z","start_local":"03:00"},{"end":"2025-07-18T03:05Z","end_local":"06:05","hours":2.08,"label":"unusable","mean_quality":0.0,"start":"2025-07-18T01:00Z","start_local":"04:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":47,"dark":false,"high":39,"local":"20:00","low":0,"mid":14,"precip":0.0,"rh":59,"temp":17.8,"time":"2025-07-17T17:00Z","wind":9.3},{"cloud":11,"dark":false,"high":11,"local":"21:00","low":0,"mid":1,"precip":0.0,"rh":70,"temp":15.4,"time":"2025-07-17T18:00Z","wind":4.4},{"cloud":100,"dark":false,"high":100,"local":"22:00","low":50,"mid":33,"precip":0.9,"rh":80,"temp":13.8,"time":"2025-07-17T19:00Z","wind":8.5},{"cloud":100,"dark":true,"high":100,"local":"23:00","low":0,"mid":81,"precip":2.8,"rh":97,"temp":12.9,"time":"2025-07-17T20:00Z","wind":3.2},{"cloud":27,"dark":true,"high":23,"local":"00:00","low":0,"mid":5,"precip":0.8,"rh":96,"temp":12.6,"time":"2025-07-17T21:00Z","wind":5.0},{"cloud":10,"dark":true,"high":0,"local":"01:00","low":0,"mid":10,"precip":0.0,"rh":98,"temp":11.3,"time":"2025-07-17T22:00Z","wind":3.2},{"cloud":8,"dark":true,"high":0,"local":"02:00","low":1,"mid":8,"precip":0.0,"rh":100,"temp":10.7,"time":"2025-07-17T23:00Z","wind":3.1},{"cloud":43,"dark":true,"high":17,"local":"03:00","low":31,"mid":7,"precip":0.0,"rh":99,"temp":10.3,"time":"2025-07-18T00:00Z","wind":4.3},{"cloud":99,"dark":true,"high":4,"local":"04:00","low":99,"mid":1,"precip":0.0,"rh":97,"temp":10.7,"time":"2025-07-18T01:00Z","wind":7.1},{"cloud":84,"dark":false,"high":1,"local":"05:00","low":83,"mid":5,"precip":0.0,"rh":98,"temp":9.6,"time":"2025-07-18T02:00Z","wind":7.3},{"cloud":69,"dark":false,"high":62,"local":"06:00","low":18,"mid":1,"precip":0.0,"rh":98,"temp":8.9,"time":"2025-07-18T03:00Z","wind":6.9},{"cloud":83,"dark":false,"high":81,"local":"07:00","low":6,"mid":0,"precip":0.0,"rh":97,"temp":9.1,"time":"2025-07-18T04:00Z","wind":7.6}],"forecast_source":"history","forecast_updated_at":"2026-10-25T01:34:18Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-07-17T19:54:34Z","dark_hours":5.1,"dark_to":"2025-07-18T01:00:18Z","moon":{"illumination":0.511,"phase":"last quarter","waxing":false},"moon_free_dark_hours":1.47,"moonrise":"2025-07-17T21:23:37Z","moonset":"2025-07-17T10:04:45Z","sunrise":"2025-07-18T03:02:16Z","sunset":"2025-07-17T17:52:37Z","twilight":{"astronomical":{"end":"2025-07-17T19:54:34Z","start":"2025-07-18T01:00:18Z"},"civil":{"end":"2025-07-17T18:25:24Z","start":"2025-07-18T02:29:29Z"},"nautical":{"end":"2025-07-17T19:06:47Z","start":"2025-07-18T01:48:05Z"}},"window_end":"2025-07-18T09:00:00Z","window_start":"2025-07-17T09:00:00Z"},"night_date":"2025-07-17","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}