{"assessment":{"best_window":{"end":"2025-08-23T02:00Z","end_local":"05:00","hours":7.08,"label":"good","mean_quality":0.97,"start":"2025-08-22T18:55Z","start_local":"21:55"},"cost":{"altitude":0.0,"clouds":0.29,"darkness":2.62,"moon":0.0},"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":"Worth it","hourly":[{"alt":null,"cloud":9,"high":0,"iso":"2025-08-22T18:00Z","label":"poor","low":7,"mid":2,"moon_alt":-11,"precip":0.0,"q":0.14,"rh":71,"sky":"nautical twilight","temp":13.9,"time":"21:00","wind":5.7},{"alt":null,"cloud":21,"high":0,"iso":"2025-08-22T19:00Z","label":"good","low":5,"mid":17,"moon_alt":-20,"precip":0.0,"q":0.77,"rh":78,"sky":"night","temp":12.5,"time":"22:00","wind":4.5},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-22T20:00Z","label":"good","low":0,"mid":0,"moon_alt":-27,"precip":0.0,"q":1.0,"rh":82,"sky":"night","temp":11.5,"time":"23:00","wind":3.3},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-22T21:00Z","label":"good","low":0,"mid":0,"moon_alt":-32,"precip":0.0,"q":1.0,"rh":83,"sky":"night","temp":11.0,"time":"00:00","wind":6.2},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-22T22:00Z","label":"good","low":0,"mid":0,"moon_alt":-34,"precip":0.0,"q":1.0,"rh":86,"sky":"night","temp":10.4,"time":"01:00","wind":5.9},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-22T23:00Z","label":"good","low":0,"mid":0,"moon_alt":-34,"precip":0.0,"q":1.0,"rh":87,"sky":"night","temp":10.0,"time":"02:00","wind":6.0},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-23T00:00Z","label":"good","low":0,"mid":0,"moon_alt":-30,"precip":0.0,"q":1.0,"rh":87,"sky":"night","temp":9.8,"time":"03:00","wind":6.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-23T01:00Z","label":"good","low":0,"mid":0,"moon_alt":-24,"precip":0.0,"q":1.0,"rh":85,"sky":"night","temp":9.4,"time":"04:00","wind":7.6},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-23T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-16,"precip":0.0,"q":0.5,"rh":85,"sky":"astronomical twilight","temp":9.1,"time":"05:00","wind":7.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-08-23T03:00Z","label":"poor","low":0,"mid":0,"moon_alt":-6,"precip":0.0,"q":0.15,"rh":87,"sky":"nautical twilight","temp":8.6,"time":"06:00","wind":7.8}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":7.59,"reasons":["daylight and twilight cost 2.6 quality-hours"],"reference_hours":4.0,"score":96,"score_astronomy":100,"score_weather":96,"sky_hours":7.88,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-08-22T17:40Z","end_local":"20:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-08-22T17:10Z","start_local":"20:10"},{"end":"2025-08-22T18:15Z","end_local":"21:15","hours":0.58,"label":"poor","mean_quality":0.12,"start":"2025-08-22T17:40Z","start_local":"20:40"},{"end":"2025-08-22T18:55Z","end_local":"21:55","hours":0.67,"label":"marginal","mean_quality":0.45,"start":"2025-08-22T18:15Z","start_local":"21:15"},{"end":"2025-08-23T02:00Z","end_local":"05:00","hours":7.08,"label":"good","mean_quality":0.97,"start":"2025-08-22T18:55Z","start_local":"21:55"},{"end":"2025-08-23T02:35Z","end_local":"05:35","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2025-08-23T02:00Z","start_local":"05:00"},{"end":"2025-08-23T03:10Z","end_local":"06:10","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2025-08-23T02:35Z","start_local":"05:35"},{"end":"2025-08-23T03:40Z","end_local":"06:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-08-23T03:10Z","start_local":"06:10"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":20,"dark":false,"high":2,"local":"20:00","low":16,"mid":5,"precip":0.0,"rh":60,"temp":15.5,"time":"2025-08-22T17:00Z","wind":4.9},{"cloud":9,"dark":false,"high":0,"local":"21:00","low":7,"mid":2,"precip":0.0,"rh":71,"temp":13.9,"time":"2025-08-22T18:00Z","wind":5.7},{"cloud":21,"dark":true,"high":0,"local":"22:00","low":5,"mid":17,"precip":0.0,"rh":78,"temp":12.5,"time":"2025-08-22T19:00Z","wind":4.5},{"cloud":0,"dark":true,"high":0,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":11.5,"time":"2025-08-22T20:00Z","wind":3.3},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":11.0,"time":"2025-08-22T21:00Z","wind":6.2},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":86,"temp":10.4,"time":"2025-08-22T22:00Z","wind":5.9},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":87,"temp":10.0,"time":"2025-08-22T23:00Z","wind":6.0},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":87,"temp":9.8,"time":"2025-08-23T00:00Z","wind":6.8},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":85,"temp":9.4,"time":"2025-08-23T01:00Z","wind":7.6},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":85,"temp":9.1,"time":"2025-08-23T02:00Z","wind":7.8},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":87,"temp":8.6,"time":"2025-08-23T03:00Z","wind":7.8},{"cloud":0,"dark":false,"high":0,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":88,"temp":8.2,"time":"2025-08-23T04:00Z","wind":7.6}],"forecast_source":"history","forecast_updated_at":"2026-10-23T13:51:35Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-08-22T18:52:17Z","dark_hours":7.06,"dark_to":"2025-08-23T01:55:46Z","moon":{"illumination":0.001,"phase":"new moon","waxing":false},"moon_free_dark_hours":7.03,"moonrise":"2025-08-23T03:38:20Z","moonset":"2025-08-22T16:53:53Z","sunrise":"2025-08-23T03:37:47Z","sunset":"2025-08-22T17:10:18Z","twilight":{"astronomical":{"end":"2025-08-22T18:52:17Z","start":"2025-08-23T01:55:46Z"},"civil":{"end":"2025-08-22T17:39:31Z","start":"2025-08-23T03:08:34Z"},"nautical":{"end":"2025-08-22T18:14:46Z","start":"2025-08-23T02:33:17Z"}},"window_end":"2025-08-23T09:00:00Z","window_start":"2025-08-22T09:00:00Z"},"night_date":"2025-08-22","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}