{"assessment":{"best_window":{"end":"2026-03-02T03:00Z","end_local":"05:00","hours":3.67,"label":"marginal","mean_quality":0.39,"start":"2026-03-01T23:20Z","start_local":"01:20"},"cost":{"altitude":0.0,"clouds":0.39,"darkness":2.41,"moon":6.72},"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":0,"high":0,"iso":"2026-03-01T17:00Z","label":"poor","low":0,"mid":0,"moon_alt":31,"precip":0.0,"q":0.06,"rh":75,"sky":"nautical twilight","temp":-3.7,"time":"19:00","wind":0.6},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-01T18:00Z","label":"marginal","low":0,"mid":0,"moon_alt":41,"precip":0.0,"q":0.36,"rh":74,"sky":"night","temp":-1.9,"time":"20:00","wind":0.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-01T19:00Z","label":"marginal","low":0,"mid":0,"moon_alt":51,"precip":0.0,"q":0.31,"rh":74,"sky":"night","temp":-3.7,"time":"21:00","wind":1.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-01T20:00Z","label":"poor","low":0,"mid":0,"moon_alt":59,"precip":0.0,"q":0.28,"rh":69,"sky":"night","temp":-4.0,"time":"22:00","wind":1.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-01T21:00Z","label":"poor","low":0,"mid":0,"moon_alt":64,"precip":0.0,"q":0.26,"rh":61,"sky":"night","temp":-3.6,"time":"23:00","wind":1.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-01T22:00Z","label":"poor","low":0,"mid":0,"moon_alt":62,"precip":0.0,"q":0.27,"rh":56,"sky":"night","temp":-3.1,"time":"00:00","wind":0.6},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-01T23:00Z","label":"poor","low":0,"mid":0,"moon_alt":56,"precip":0.0,"q":0.29,"rh":51,"sky":"night","temp":-2.7,"time":"01:00","wind":0.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-02T00:00Z","label":"marginal","low":0,"mid":0,"moon_alt":47,"precip":0.0,"q":0.33,"rh":47,"sky":"night","temp":-1.6,"time":"02:00","wind":1.3},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-02T01:00Z","label":"marginal","low":0,"mid":0,"moon_alt":36,"precip":0.0,"q":0.38,"rh":47,"sky":"night","temp":-1.6,"time":"03:00","wind":0.6},{"alt":null,"cloud":5,"high":5,"iso":"2026-03-02T02:00Z","label":"marginal","low":0,"mid":0,"moon_alt":25,"precip":0.0,"q":0.42,"rh":44,"sky":"night","temp":-1.6,"time":"04:00","wind":0.9},{"alt":null,"cloud":76,"high":76,"iso":"2026-03-02T03:00Z","label":"poor","low":0,"mid":0,"moon_alt":14,"precip":0.0,"q":0.08,"rh":39,"sky":"night","temp":-1.5,"time":"05:00","wind":0.9},{"alt":null,"cloud":82,"high":82,"iso":"2026-03-02T04:00Z","label":"unusable","low":0,"mid":0,"moon_alt":4,"precip":0.0,"q":0.0,"rh":36,"sky":"nautical twilight","temp":-1.5,"time":"06:00","wind":1.0}],"peak_quality":0.48,"peak_sky":0.54,"quality_hours":3.23,"reasons":["moonlight cost 6.7 quality-hours","daylight and twilight cost 2.4 quality-hours","cloud cover cost 0.4 quality-hours"],"reference_hours":4.0,"score":44,"score_astronomy":49,"score_weather":89,"sky_hours":3.62,"verdict":"marginal","verdict_astronomy":"marginal","weather_known":true,"windows":[{"end":"2026-03-01T16:40Z","end_local":"18:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-03-01T16:10Z","start_local":"18:10"},{"end":"2026-03-01T17:45Z","end_local":"19:45","hours":1.08,"label":"poor","mean_quality":0.12,"start":"2026-03-01T16:40Z","start_local":"18:40"},{"end":"2026-03-01T19:15Z","end_local":"21:15","hours":1.5,"label":"marginal","mean_quality":0.33,"start":"2026-03-01T17:45Z","start_local":"19:45"},{"end":"2026-03-01T23:20Z","end_local":"01:20","hours":4.08,"label":"poor","mean_quality":0.27,"start":"2026-03-01T19:15Z","start_local":"21:15"},{"end":"2026-03-02T03:00Z","end_local":"05:00","hours":3.67,"label":"marginal","mean_quality":0.39,"start":"2026-03-01T23:20Z","start_local":"01:20"},{"end":"2026-03-02T04:00Z","end_local":"06:00","hours":1.0,"label":"poor","mean_quality":0.06,"start":"2026-03-02T03:00Z","start_local":"05:00"},{"end":"2026-03-02T04:55Z","end_local":"06:55","hours":0.92,"label":"unusable","mean_quality":0.0,"start":"2026-03-02T04:00Z","start_local":"06:00"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":0,"dark":false,"high":0,"local":"18:00","low":0,"mid":0,"precip":0.0,"rh":71,"temp":-2.3,"time":"2026-03-01T16:00Z","wind":1.4},{"cloud":0,"dark":false,"high":0,"local":"19:00","low":0,"mid":0,"precip":0.0,"rh":75,"temp":-3.7,"time":"2026-03-01T17:00Z","wind":0.6},{"cloud":0,"dark":true,"high":0,"local":"20:00","low":0,"mid":0,"precip":0.0,"rh":74,"temp":-1.9,"time":"2026-03-01T18:00Z","wind":0.5},{"cloud":0,"dark":true,"high":0,"local":"21:00","low":0,"mid":0,"precip":0.0,"rh":74,"temp":-3.7,"time":"2026-03-01T19:00Z","wind":1.9},{"cloud":0,"dark":true,"high":0,"local":"22:00","low":0,"mid":0,"precip":0.0,"rh":69,"temp":-4.0,"time":"2026-03-01T20:00Z","wind":1.9},{"cloud":0,"dark":true,"high":0,"local":"23:00","low":0,"mid":0,"precip":0.0,"rh":61,"temp":-3.6,"time":"2026-03-01T21:00Z","wind":1.5},{"cloud":0,"dark":true,"high":0,"local":"00:00","low":0,"mid":0,"precip":0.0,"rh":56,"temp":-3.1,"time":"2026-03-01T22:00Z","wind":0.6},{"cloud":0,"dark":true,"high":0,"local":"01:00","low":0,"mid":0,"precip":0.0,"rh":51,"temp":-2.7,"time":"2026-03-01T23:00Z","wind":0.5},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":47,"temp":-1.6,"time":"2026-03-02T00:00Z","wind":1.3},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":47,"temp":-1.6,"time":"2026-03-02T01:00Z","wind":0.6},{"cloud":5,"dark":true,"high":5,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":44,"temp":-1.6,"time":"2026-03-02T02:00Z","wind":0.9},{"cloud":76,"dark":true,"high":76,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":39,"temp":-1.5,"time":"2026-03-02T03:00Z","wind":0.9},{"cloud":82,"dark":false,"high":82,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":36,"temp":-1.5,"time":"2026-03-02T04:00Z","wind":1.0},{"cloud":88,"dark":false,"high":88,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":33,"temp":-1.5,"time":"2026-03-02T05:00Z","wind":0.9}],"forecast_source":"history","forecast_updated_at":"2026-10-16T06:26:14Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-03-01T17:43:35Z","dark_hours":9.65,"dark_to":"2026-03-02T03:22:24Z","moon":{"illumination":0.972,"phase":"full moon","waxing":true},"moon_free_dark_hours":0.0,"moonrise":"2026-03-01T14:05:27Z","moonset":"2026-03-02T04:19:24Z","sunrise":"2026-03-02T04:54:33Z","sunset":"2026-03-01T16:11:14Z","twilight":{"astronomical":{"end":"2026-03-01T17:43:35Z","start":"2026-03-02T03:22:24Z"},"civil":{"end":"2026-03-01T16:39:09Z","start":"2026-03-02T04:26:43Z"},"nautical":{"end":"2026-03-01T17:11:21Z","start":"2026-03-02T03:54:35Z"}},"window_end":"2026-03-02T10:00:00Z","window_start":"2026-03-01T10:00:00Z"},"night_date":"2026-03-01","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
