{"assessment":{"best_window":{"end":"2026-08-22T01:55Z","end_local":"04:55","hours":7.0,"label":"good","mean_quality":0.89,"start":"2026-08-21T18:55Z","start_local":"21:55"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.7,"moon":0.94},"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":0,"high":0,"iso":"2026-08-21T18:00Z","label":"poor","low":0,"mid":0,"moon_alt":19,"precip":0.0,"q":0.1,"rh":72,"sky":"nautical twilight","temp":17.0,"time":"21:00","wind":2.2},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-21T19:00Z","label":"good","low":0,"mid":0,"moon_alt":16,"precip":0.0,"q":0.66,"rh":68,"sky":"night","temp":16.6,"time":"22:00","wind":1.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-21T20:00Z","label":"good","low":0,"mid":0,"moon_alt":11,"precip":0.0,"q":0.68,"rh":63,"sky":"night","temp":16.2,"time":"23:00","wind":1.0},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-21T21:00Z","label":"good","low":0,"mid":0,"moon_alt":4,"precip":0.0,"q":0.71,"rh":61,"sky":"night","temp":15.7,"time":"00:00","wind":1.7},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-21T22:00Z","label":"good","low":0,"mid":0,"moon_alt":-5,"precip":0.0,"q":1.0,"rh":61,"sky":"night","temp":15.4,"time":"01:00","wind":1.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-21T23:00Z","label":"good","low":0,"mid":0,"moon_alt":-14,"precip":0.0,"q":1.0,"rh":61,"sky":"night","temp":14.9,"time":"02:00","wind":3.1},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-22T00:00Z","label":"good","low":0,"mid":0,"moon_alt":-24,"precip":0.0,"q":1.0,"rh":63,"sky":"night","temp":13.6,"time":"03:00","wind":4.2},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-22T01:00Z","label":"good","low":0,"mid":0,"moon_alt":-34,"precip":0.0,"q":1.0,"rh":66,"sky":"night","temp":13.3,"time":"04:00","wind":4.2},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-22T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-45,"precip":0.0,"q":0.5,"rh":72,"sky":"astronomical twilight","temp":12.6,"time":"05:00","wind":4.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-22T03:00Z","label":"poor","low":0,"mid":0,"moon_alt":-56,"precip":0.0,"q":0.15,"rh":74,"sky":"nautical twilight","temp":12.5,"time":"06:00","wind":4.4}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":6.86,"reasons":["daylight and twilight cost 2.7 quality-hours","moonlight cost 0.9 quality-hours"],"reference_hours":4.0,"score":100,"score_astronomy":100,"score_weather":100,"sky_hours":6.86,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-08-21T17:45Z","end_local":"20:45","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-08-21T17:10Z","start_local":"20:10"},{"end":"2026-08-21T18:20Z","end_local":"21:20","hours":0.58,"label":"poor","mean_quality":0.1,"start":"2026-08-21T17:45Z","start_local":"20:45"},{"end":"2026-08-21T18:55Z","end_local":"21:55","hours":0.58,"label":"marginal","mean_quality":0.33,"start":"2026-08-21T18:20Z","start_local":"21:20"},{"end":"2026-08-22T01:55Z","end_local":"04:55","hours":7.0,"label":"good","mean_quality":0.89,"start":"2026-08-21T18:55Z","start_local":"21:55"},{"end":"2026-08-22T02:35Z","end_local":"05:35","hours":0.67,"label":"marginal","mean_quality":0.5,"start":"2026-08-22T01:55Z","start_local":"04:55"},{"end":"2026-08-22T03:10Z","end_local":"06:10","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2026-08-22T02:35Z","start_local":"05:35"},{"end":"2026-08-22T03:40Z","end_local":"06:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-08-22T03:10Z","start_local":"06:10"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":0,"dark":false,"high":0,"local":"20:00","low":0,"mid":0,"precip":0.0,"rh":71,"temp":18.2,"time":"2026-08-21T17:00Z","wind":1.5},{"cloud":0,"dark":false,"high":0,"local":"21:00","low":0,"mid":0,"precip":0.0,"rh":72,"temp":17.0,"time":"2026-08-21T18:00Z","wind":2.2},{"cloud":0,"dark":true,"high":0,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":68,"temp":16.6,"time":"2026-08-21T19:00Z","wind":1.9},{"cloud":0,"dark":true,"high":0,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":63,"temp":16.2,"time":"2026-08-21T20:00Z","wind":1.0},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":61,"temp":15.7,"time":"2026-08-21T21:00Z","wind":1.7},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":61,"temp":15.4,"time":"2026-08-21T22:00Z","wind":1.5},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":61,"temp":14.9,"time":"2026-08-21T23:00Z","wind":3.1},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":63,"temp":13.6,"time":"2026-08-22T00:00Z","wind":4.2},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":66,"temp":13.3,"time":"2026-08-22T01:00Z","wind":4.2},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":72,"temp":12.6,"time":"2026-08-22T02:00Z","wind":4.5},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":74,"temp":12.5,"time":"2026-08-22T03:00Z","wind":4.4},{"cloud":0,"dark":false,"high":0,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":75,"temp":12.8,"time":"2026-08-22T04:00Z","wind":5.1}],"forecast_source":"history","forecast_updated_at":"2026-10-10T22:36:22Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-08-21T18:54:44Z","dark_hours":6.99,"dark_to":"2026-08-22T01:53:57Z","moon":{"illumination":0.67,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":4.42,"moonrise":"2026-08-21T13:08:41Z","moonset":"2026-08-21T21:27:24Z","sunrise":"2026-08-22T03:36:31Z","sunset":"2026-08-21T17:12:13Z","twilight":{"astronomical":{"end":"2026-08-21T18:54:44Z","start":"2026-08-22T01:53:57Z"},"civil":{"end":"2026-08-21T17:41:31Z","start":"2026-08-22T03:07:12Z"},"nautical":{"end":"2026-08-21T18:16:57Z","start":"2026-08-22T02:31:45Z"}},"window_end":"2026-08-22T09:00:00Z","window_start":"2026-08-21T09:00:00Z"},"night_date":"2026-08-21","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
