{"assessment":{"best_window":{"end":"2026-05-07T00:55Z","end_local":"03:55","hours":5.58,"label":"good","mean_quality":0.81,"start":"2026-05-06T19:20Z","start_local":"22:20"},"cost":{"altitude":0.0,"clouds":0.2,"darkness":2.99,"moon":1.29},"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":"2026-05-06T18:00Z","label":"poor","low":0,"mid":0,"moon_alt":-43,"precip":0.0,"q":0.15,"rh":80,"sky":"nautical twilight","temp":6.5,"time":"21:00","wind":4.3},{"alt":null,"cloud":16,"high":16,"iso":"2026-05-06T19:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-32,"precip":0.0,"q":0.41,"rh":81,"sky":"astronomical twilight","temp":5.6,"time":"22:00","wind":4.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T20:00Z","label":"good","low":0,"mid":0,"moon_alt":-22,"precip":0.0,"q":1.0,"rh":81,"sky":"night","temp":5.4,"time":"23:00","wind":5.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T21:00Z","label":"good","low":0,"mid":0,"moon_alt":-12,"precip":0.0,"q":1.0,"rh":81,"sky":"night","temp":4.7,"time":"00:00","wind":4.9},{"alt":null,"cloud":1,"high":1,"iso":"2026-05-06T22:00Z","label":"good","low":0,"mid":0,"moon_alt":-2,"precip":0.0,"q":0.99,"rh":80,"sky":"night","temp":4.3,"time":"01:00","wind":4.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-06T23:00Z","label":"good","low":0,"mid":0,"moon_alt":6,"precip":0.0,"q":0.66,"rh":82,"sky":"night","temp":3.6,"time":"02:00","wind":4.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-07T00:00Z","label":"good","low":0,"mid":0,"moon_alt":13,"precip":0.0,"q":0.62,"rh":77,"sky":"night","temp":4.0,"time":"03:00","wind":4.7},{"alt":null,"cloud":9,"high":9,"iso":"2026-05-07T01:00Z","label":"marginal","low":0,"mid":1,"moon_alt":18,"precip":0.0,"q":0.54,"rh":79,"sky":"night","temp":4.0,"time":"04:00","wind":5.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-05-07T02:00Z","label":"poor","low":0,"mid":0,"moon_alt":21,"precip":0.0,"q":0.29,"rh":80,"sky":"astronomical twilight","temp":3.8,"time":"05:00","wind":5.6},{"alt":null,"cloud":38,"high":37,"iso":"2026-05-07T03:00Z","label":"unusable","low":0,"mid":2,"moon_alt":21,"precip":0.0,"q":0.0,"rh":80,"sky":"civil twilight","temp":3.4,"time":"06:00","wind":5.3}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.44,"reasons":["daylight and twilight cost 3.0 quality-hours","moonlight cost 1.3 quality-hours"],"reference_hours":4.0,"score":97,"score_astronomy":100,"score_weather":97,"sky_hours":5.63,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-05-06T18:00Z","end_local":"21:00","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2026-05-06T17:20Z","start_local":"20:20"},{"end":"2026-05-06T18:35Z","end_local":"21:35","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2026-05-06T18:00Z","start_local":"21:00"},{"end":"2026-05-06T19:20Z","end_local":"22:20","hours":0.75,"label":"marginal","mean_quality":0.46,"start":"2026-05-06T18:35Z","start_local":"21:35"},{"end":"2026-05-07T00:55Z","end_local":"03:55","hours":5.58,"label":"good","mean_quality":0.81,"start":"2026-05-06T19:20Z","start_local":"22:20"},{"end":"2026-05-07T01:20Z","end_local":"04:20","hours":0.42,"label":"marginal","mean_quality":0.55,"start":"2026-05-07T00:55Z","start_local":"03:55"},{"end":"2026-05-07T02:40Z","end_local":"05:40","hours":1.33,"label":"poor","mean_quality":0.19,"start":"2026-05-07T01:20Z","start_local":"04:20"},{"end":"2026-05-07T03:15Z","end_local":"06:15","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-05-07T02:40Z","start_local":"05:40"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":9,"dark":false,"high":7,"local":"20:00","low":1,"mid":2,"precip":0.0,"rh":74,"temp":8.2,"time":"2026-05-06T17:00Z","wind":4.4},{"cloud":0,"dark":false,"high":0,"local":"21:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":6.5,"time":"2026-05-06T18:00Z","wind":4.3},{"cloud":16,"dark":false,"high":16,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":5.6,"time":"2026-05-06T19:00Z","wind":4.9},{"cloud":0,"dark":true,"high":0,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":5.4,"time":"2026-05-06T20:00Z","wind":5.9},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":4.7,"time":"2026-05-06T21:00Z","wind":4.9},{"cloud":1,"dark":true,"high":1,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":4.3,"time":"2026-05-06T22:00Z","wind":4.9},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":3.6,"time":"2026-05-06T23:00Z","wind":4.5},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":77,"temp":4.0,"time":"2026-05-07T00:00Z","wind":4.7},{"cloud":9,"dark":true,"high":9,"local":"04:00","low":0,"mid":1,"precip":0.0,"rh":79,"temp":4.0,"time":"2026-05-07T01:00Z","wind":5.5},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":3.8,"time":"2026-05-07T02:00Z","wind":5.6},{"cloud":38,"dark":false,"high":37,"local":"06:00","low":0,"mid":2,"precip":0.0,"rh":80,"temp":3.4,"time":"2026-05-07T03:00Z","wind":5.3},{"cloud":12,"dark":false,"high":4,"local":"07:00","low":0,"mid":9,"precip":0.0,"rh":79,"temp":4.3,"time":"2026-05-07T04:00Z","wind":4.2}],"forecast_source":"history","forecast_updated_at":"2026-10-14T07:01:24Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-05-06T19:15:10Z","dark_hours":6.08,"dark_to":"2026-05-07T01:19:41Z","moon":{"illumination":0.771,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":3.0,"moonrise":"2026-05-06T22:16:08Z","moonset":"2026-05-07T06:49:07Z","sunrise":"2026-05-07T03:10:23Z","sunset":"2026-05-06T17:24:26Z","twilight":{"astronomical":{"end":"2026-05-06T19:15:10Z","start":"2026-05-07T01:19:41Z"},"civil":{"end":"2026-05-06T17:55:17Z","start":"2026-05-07T02:39:33Z"},"nautical":{"end":"2026-05-06T18:33:18Z","start":"2026-05-07T02:01:33Z"}},"window_end":"2026-05-07T09:00:00Z","window_start":"2026-05-06T09:00:00Z"},"night_date":"2026-05-06","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
