{"assessment":{"best_window":{"end":"2025-06-30T00:40Z","end_local":"03:40","hours":4.5,"label":"good","mean_quality":0.98,"start":"2025-06-29T20:10Z","start_local":"23:10"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":3.32,"moon":0.13},"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":2,"high":0,"iso":"2025-06-29T18:00Z","label":"unusable","low":2,"mid":0,"moon_alt":31,"precip":0.0,"q":0.0,"rh":72,"sky":"civil twilight","temp":11.6,"time":"21:00","wind":9.4},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-29T19:00Z","label":"poor","low":0,"mid":0,"moon_alt":20,"precip":0.0,"q":0.13,"rh":81,"sky":"nautical twilight","temp":10.1,"time":"22:00","wind":7.5},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-29T20:00Z","label":"marginal","low":0,"mid":0,"moon_alt":9,"precip":0.0,"q":0.45,"rh":84,"sky":"astronomical twilight","temp":9.6,"time":"23:00","wind":8.0},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-29T21:00Z","label":"good","low":0,"mid":0,"moon_alt":-1,"precip":0.0,"q":1.0,"rh":81,"sky":"night","temp":9.8,"time":"00:00","wind":7.3},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-29T22:00Z","label":"good","low":0,"mid":0,"moon_alt":-12,"precip":0.0,"q":1.0,"rh":77,"sky":"night","temp":9.9,"time":"01:00","wind":6.5},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-29T23:00Z","label":"good","low":0,"mid":0,"moon_alt":-21,"precip":0.0,"q":1.0,"rh":75,"sky":"night","temp":10.1,"time":"02:00","wind":6.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-30T00:00Z","label":"good","low":0,"mid":0,"moon_alt":-29,"precip":0.0,"q":1.0,"rh":74,"sky":"night","temp":10.0,"time":"03:00","wind":5.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-30T01:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-36,"precip":0.0,"q":0.5,"rh":72,"sky":"astronomical twilight","temp":10.3,"time":"04:00","wind":6.2},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-30T02:00Z","label":"poor","low":0,"mid":0,"moon_alt":-39,"precip":0.0,"q":0.15,"rh":72,"sky":"nautical twilight","temp":10.5,"time":"05:00","wind":6.1}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.46,"reasons":["daylight and twilight cost 3.3 quality-hours"],"reference_hours":4.0,"score":100,"score_astronomy":100,"score_weather":100,"sky_hours":5.47,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-06-29T18:35Z","end_local":"21:35","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2025-06-29T17:55Z","start_local":"20:55"},{"end":"2025-06-29T19:20Z","end_local":"22:20","hours":0.75,"label":"poor","mean_quality":0.13,"start":"2025-06-29T18:35Z","start_local":"21:35"},{"end":"2025-06-29T20:10Z","end_local":"23:10","hours":0.83,"label":"marginal","mean_quality":0.44,"start":"2025-06-29T19:20Z","start_local":"22:20"},{"end":"2025-06-30T00:40Z","end_local":"03:40","hours":4.5,"label":"good","mean_quality":0.98,"start":"2025-06-29T20:10Z","start_local":"23:10"},{"end":"2025-06-30T01:35Z","end_local":"04:35","hours":0.92,"label":"marginal","mean_quality":0.5,"start":"2025-06-30T00:40Z","start_local":"03:40"},{"end":"2025-06-30T02:20Z","end_local":"05:20","hours":0.75,"label":"poor","mean_quality":0.15,"start":"2025-06-30T01:35Z","start_local":"04:35"},{"end":"2025-06-30T02:50Z","end_local":"05:50","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-06-30T02:20Z","start_local":"05:20"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":8,"dark":false,"high":0,"local":"20:00","low":8,"mid":0,"precip":0.0,"rh":62,"temp":13.7,"time":"2025-06-29T17:00Z","wind":15.6},{"cloud":2,"dark":false,"high":0,"local":"21:00","low":2,"mid":0,"precip":0.0,"rh":72,"temp":11.6,"time":"2025-06-29T18:00Z","wind":9.4},{"cloud":0,"dark":false,"high":0,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":10.1,"time":"2025-06-29T19:00Z","wind":7.5},{"cloud":0,"dark":false,"high":0,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":9.6,"time":"2025-06-29T20:00Z","wind":8.0},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":9.8,"time":"2025-06-29T21:00Z","wind":7.3},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":77,"temp":9.9,"time":"2025-06-29T22:00Z","wind":6.5},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":75,"temp":10.1,"time":"2025-06-29T23:00Z","wind":6.8},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":74,"temp":10.0,"time":"2025-06-30T00:00Z","wind":5.8},{"cloud":0,"dark":false,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":72,"temp":10.3,"time":"2025-06-30T01:00Z","wind":6.2},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":72,"temp":10.5,"time":"2025-06-30T02:00Z","wind":6.1},{"cloud":2,"dark":false,"high":0,"local":"06:00","low":2,"mid":0,"precip":0.0,"rh":72,"temp":10.4,"time":"2025-06-30T03:00Z","wind":6.2}],"forecast_source":"history","forecast_updated_at":"2026-10-25T18:16:49Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-06-29T20:09:41Z","dark_hours":4.5,"dark_to":"2025-06-30T00:39:47Z","moon":{"illumination":0.23,"phase":"waxing crescent","waxing":true},"moon_free_dark_hours":3.78,"moonrise":"2025-06-30T08:13:11Z","moonset":"2025-06-29T20:51:17Z","sunrise":"2025-06-30T02:49:51Z","sunset":"2025-06-29T17:59:37Z","twilight":{"astronomical":{"end":"2025-06-29T20:09:41Z","start":"2025-06-30T00:39:47Z"},"civil":{"end":"2025-06-29T18:33:41Z","start":"2025-06-30T02:15:48Z"},"nautical":{"end":"2025-06-29T19:17:22Z","start":"2025-06-30T01:32:06Z"}},"window_end":"2025-06-30T09:00:00Z","window_start":"2025-06-29T09:00:00Z"},"night_date":"2025-06-29","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}