{"assessment":{"best_window":{"end":"2025-06-09T00:40Z","end_local":"03:40","hours":0.08,"label":"good","mean_quality":0.6,"start":"2025-06-09T00:35Z","start_local":"03:35"},"cost":{"altitude":0.0,"clouds":0.03,"darkness":3.36,"moon":2.59},"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":18,"high":18,"iso":"2025-06-08T18:00Z","label":"unusable","low":0,"mid":0,"moon_alt":18,"precip":0.0,"q":0.0,"rh":82,"sky":"civil twilight","temp":13.8,"time":"21:00","wind":1.4},{"alt":null,"cloud":5,"high":5,"iso":"2025-06-08T19:00Z","label":"poor","low":0,"mid":0,"moon_alt":23,"precip":0.0,"q":0.07,"rh":77,"sky":"nautical twilight","temp":13.2,"time":"22:00","wind":1.2},{"alt":null,"cloud":1,"high":1,"iso":"2025-06-08T20:00Z","label":"poor","low":0,"mid":1,"moon_alt":25,"precip":0.0,"q":0.23,"rh":74,"sky":"astronomical twilight","temp":12.7,"time":"23:00","wind":1.9},{"alt":null,"cloud":1,"high":0,"iso":"2025-06-08T21:00Z","label":"marginal","low":0,"mid":0,"moon_alt":25,"precip":0.0,"q":0.46,"rh":75,"sky":"night","temp":12.0,"time":"00:00","wind":2.2},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-08T22:00Z","label":"marginal","low":0,"mid":0,"moon_alt":21,"precip":0.0,"q":0.48,"rh":78,"sky":"night","temp":11.5,"time":"01:00","wind":3.4},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-08T23:00Z","label":"marginal","low":0,"mid":0,"moon_alt":16,"precip":0.0,"q":0.52,"rh":81,"sky":"night","temp":11.1,"time":"02:00","wind":3.6},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-09T00:00Z","label":"marginal","low":0,"mid":0,"moon_alt":8,"precip":0.0,"q":0.57,"rh":83,"sky":"night","temp":10.8,"time":"03:00","wind":3.8},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-09T01:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-1,"precip":0.0,"q":0.5,"rh":84,"sky":"astronomical twilight","temp":10.2,"time":"04:00","wind":4.7},{"alt":null,"cloud":0,"high":0,"iso":"2025-06-09T02:00Z","label":"poor","low":0,"mid":0,"moon_alt":-11,"precip":0.0,"q":0.15,"rh":82,"sky":"nautical twilight","temp":10.2,"time":"05:00","wind":4.4}],"peak_quality":0.6,"peak_sky":0.6,"quality_hours":3.02,"reasons":["daylight and twilight cost 3.4 quality-hours","moonlight cost 2.6 quality-hours"],"reference_hours":4.0,"score":46,"score_astronomy":46,"score_weather":99,"sky_hours":3.05,"verdict":"marginal","verdict_astronomy":"marginal","weather_known":true,"windows":[{"end":"2025-06-08T18:30Z","end_local":"21:30","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2025-06-08T17:50Z","start_local":"20:50"},{"end":"2025-06-08T20:05Z","end_local":"23:05","hours":1.58,"label":"poor","mean_quality":0.14,"start":"2025-06-08T18:30Z","start_local":"21:30"},{"end":"2025-06-09T00:35Z","end_local":"03:35","hours":4.5,"label":"marginal","mean_quality":0.5,"start":"2025-06-08T20:05Z","start_local":"23:05"},{"end":"2025-06-09T00:40Z","end_local":"03:40","hours":0.08,"label":"good","mean_quality":0.6,"start":"2025-06-09T00:35Z","start_local":"03:35"},{"end":"2025-06-09T01:30Z","end_local":"04:30","hours":0.83,"label":"marginal","mean_quality":0.44,"start":"2025-06-09T00:40Z","start_local":"03:40"},{"end":"2025-06-09T02:15Z","end_local":"05:15","hours":0.75,"label":"poor","mean_quality":0.15,"start":"2025-06-09T01:30Z","start_local":"04:30"},{"end":"2025-06-09T02:50Z","end_local":"05:50","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-06-09T02:15Z","start_local":"05:15"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":20,"dark":false,"high":20,"local":"20:00","low":0,"mid":0,"precip":0.0,"rh":79,"temp":16.0,"time":"2025-06-08T17:00Z","wind":3.1},{"cloud":18,"dark":false,"high":18,"local":"21:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":13.8,"time":"2025-06-08T18:00Z","wind":1.4},{"cloud":5,"dark":false,"high":5,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":77,"temp":13.2,"time":"2025-06-08T19:00Z","wind":1.2},{"cloud":1,"dark":false,"high":1,"local":"23:00","low":0,"mid":1,"precip":0.0,"rh":74,"temp":12.7,"time":"2025-06-08T20:00Z","wind":1.9},{"cloud":1,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":75,"temp":12.0,"time":"2025-06-08T21:00Z","wind":2.2},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":78,"temp":11.5,"time":"2025-06-08T22:00Z","wind":3.4},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":81,"temp":11.1,"time":"2025-06-08T23:00Z","wind":3.6},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":10.8,"time":"2025-06-09T00:00Z","wind":3.8},{"cloud":0,"dark":false,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":84,"temp":10.2,"time":"2025-06-09T01:00Z","wind":4.7},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":10.2,"time":"2025-06-09T02:00Z","wind":4.4},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":10.3,"time":"2025-06-09T03:00Z","wind":4.4}],"forecast_source":"history","forecast_updated_at":"2026-10-26T02:52:58Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-06-08T20:02:59Z","dark_hours":4.57,"dark_to":"2025-06-09T00:37:23Z","moon":{"illumination":0.946,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":0.0,"moonrise":"2025-06-08T15:38:23Z","moonset":"2025-06-09T00:53:49Z","sunrise":"2025-06-09T02:46:25Z","sunset":"2025-06-08T17:53:57Z","twilight":{"astronomical":{"end":"2025-06-08T20:02:59Z","start":"2025-06-09T00:37:23Z"},"civil":{"end":"2025-06-08T18:27:51Z","start":"2025-06-09T02:12:31Z"},"nautical":{"end":"2025-06-08T19:11:16Z","start":"2025-06-09T01:29:07Z"}},"window_end":"2025-06-09T09:00:00Z","window_start":"2025-06-08T09:00:00Z"},"night_date":"2025-06-08","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
