{"assessment":{"best_window":{"end":"2026-08-04T23:15Z","end_local":"02:15","hours":3.75,"label":"good","mean_quality":0.7,"start":"2026-08-04T19:30Z","start_local":"22:30"},"cost":{"altitude":0.0,"clouds":0.23,"darkness":2.85,"moon":2.12},"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":7,"high":0,"iso":"2026-08-04T18:00Z","label":"unusable","low":0,"mid":7,"moon_alt":-21,"precip":0.0,"q":0.0,"rh":57,"sky":"civil twilight","temp":15.0,"time":"21:00","wind":7.0},{"alt":null,"cloud":9,"high":0,"iso":"2026-08-04T19:00Z","label":"marginal","low":0,"mid":9,"moon_alt":-12,"precip":0.0,"q":0.45,"rh":56,"sky":"astronomical twilight","temp":14.5,"time":"22:00","wind":5.9},{"alt":null,"cloud":7,"high":0,"iso":"2026-08-04T20:00Z","label":"good","low":0,"mid":7,"moon_alt":-2,"precip":0.0,"q":0.92,"rh":58,"sky":"night","temp":13.9,"time":"23:00","wind":6.2},{"alt":null,"cloud":5,"high":0,"iso":"2026-08-04T21:00Z","label":"good","low":0,"mid":5,"moon_alt":9,"precip":0.0,"q":0.67,"rh":60,"sky":"night","temp":13.4,"time":"00:00","wind":7.3},{"alt":null,"cloud":2,"high":0,"iso":"2026-08-04T22:00Z","label":"good","low":0,"mid":2,"moon_alt":20,"precip":0.0,"q":0.65,"rh":61,"sky":"night","temp":13.2,"time":"01:00","wind":6.0},{"alt":null,"cloud":2,"high":0,"iso":"2026-08-04T23:00Z","label":"good","low":0,"mid":2,"moon_alt":31,"precip":0.0,"q":0.61,"rh":62,"sky":"night","temp":13.1,"time":"02:00","wind":4.4},{"alt":null,"cloud":1,"high":0,"iso":"2026-08-05T00:00Z","label":"marginal","low":0,"mid":1,"moon_alt":41,"precip":0.0,"q":0.58,"rh":61,"sky":"night","temp":13.2,"time":"03:00","wind":2.5},{"alt":null,"cloud":1,"high":0,"iso":"2026-08-05T01:00Z","label":"marginal","low":0,"mid":1,"moon_alt":51,"precip":0.0,"q":0.55,"rh":61,"sky":"night","temp":13.2,"time":"04:00","wind":4.4},{"alt":null,"cloud":1,"high":0,"iso":"2026-08-05T02:00Z","label":"poor","low":0,"mid":1,"moon_alt":59,"precip":0.0,"q":0.26,"rh":61,"sky":"astronomical twilight","temp":12.9,"time":"05:00","wind":5.1},{"alt":null,"cloud":0,"high":0,"iso":"2026-08-05T03:00Z","label":"unusable","low":0,"mid":0,"moon_alt":64,"precip":0.0,"q":0.0,"rh":64,"sky":"civil twilight","temp":12.2,"time":"06:00","wind":5.2}],"peak_quality":0.92,"peak_sky":1.0,"quality_hours":4.54,"reasons":["daylight and twilight cost 2.9 quality-hours","moonlight cost 2.1 quality-hours"],"reference_hours":4.0,"score":95,"score_astronomy":100,"score_weather":95,"sky_hours":4.77,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-08-04T18:10Z","end_local":"21:10","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-08-04T17:35Z","start_local":"20:35"},{"end":"2026-08-04T18:45Z","end_local":"21:45","hours":0.58,"label":"poor","mean_quality":0.14,"start":"2026-08-04T18:10Z","start_local":"21:10"},{"end":"2026-08-04T19:30Z","end_local":"22:30","hours":0.75,"label":"marginal","mean_quality":0.45,"start":"2026-08-04T18:45Z","start_local":"21:45"},{"end":"2026-08-04T23:15Z","end_local":"02:15","hours":3.75,"label":"good","mean_quality":0.7,"start":"2026-08-04T19:30Z","start_local":"22:30"},{"end":"2026-08-05T01:30Z","end_local":"04:30","hours":2.25,"label":"marginal","mean_quality":0.57,"start":"2026-08-04T23:15Z","start_local":"02:15"},{"end":"2026-08-05T02:50Z","end_local":"05:50","hours":1.33,"label":"poor","mean_quality":0.17,"start":"2026-08-05T01:30Z","start_local":"04:30"},{"end":"2026-08-05T03:20Z","end_local":"06:20","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-08-05T02:50Z","start_local":"05:50"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":10,"dark":false,"high":0,"local":"20:00","low":0,"mid":10,"precip":0.0,"rh":61,"temp":16.4,"time":"2026-08-04T17:00Z","wind":5.7},{"cloud":7,"dark":false,"high":0,"local":"21:00","low":0,"mid":7,"precip":0.0,"rh":57,"temp":15.0,"time":"2026-08-04T18:00Z","wind":7.0},{"cloud":9,"dark":false,"high":0,"local":"22:00","low":0,"mid":9,"precip":0.0,"rh":56,"temp":14.5,"time":"2026-08-04T19:00Z","wind":5.9},{"cloud":7,"dark":true,"high":0,"local":"23:00","low":0,"mid":7,"precip":0.0,"rh":58,"temp":13.9,"time":"2026-08-04T20:00Z","wind":6.2},{"cloud":5,"dark":true,"high":0,"local":"00:00","low":0,"mid":5,"precip":0.0,"rh":60,"temp":13.4,"time":"2026-08-04T21:00Z","wind":7.3},{"cloud":2,"dark":true,"high":0,"local":"01:00","low":0,"mid":2,"precip":0.0,"rh":61,"temp":13.2,"time":"2026-08-04T22:00Z","wind":6.0},{"cloud":2,"dark":true,"high":0,"local":"02:00","low":0,"mid":2,"precip":0.0,"rh":62,"temp":13.1,"time":"2026-08-04T23:00Z","wind":4.4},{"cloud":1,"dark":true,"high":0,"local":"03:00","low":0,"mid":1,"precip":0.0,"rh":61,"temp":13.2,"time":"2026-08-05T00:00Z","wind":2.5},{"cloud":1,"dark":true,"high":0,"local":"04:00","low":0,"mid":1,"precip":0.0,"rh":61,"temp":13.2,"time":"2026-08-05T01:00Z","wind":4.4},{"cloud":1,"dark":false,"high":0,"local":"05:00","low":0,"mid":1,"precip":0.0,"rh":61,"temp":12.9,"time":"2026-08-05T02:00Z","wind":5.1},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":64,"temp":12.2,"time":"2026-08-05T03:00Z","wind":5.2},{"cloud":1,"dark":false,"high":0,"local":"07:00","low":0,"mid":1,"precip":0.0,"rh":65,"temp":12.7,"time":"2026-08-05T04:00Z","wind":5.2}],"forecast_source":"history","forecast_updated_at":"2026-10-11T06:44:06Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-08-04T19:26:56Z","dark_hours":6.01,"dark_to":"2026-08-05T01:27:45Z","moon":{"illumination":0.628,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":0.75,"moonrise":"2026-08-04T20:12:23Z","moonset":"2026-08-04T09:13:51Z","sunrise":"2026-08-05T03:19:06Z","sunset":"2026-08-04T17:35:36Z","twilight":{"astronomical":{"end":"2026-08-04T19:26:56Z","start":"2026-08-05T01:27:45Z"},"civil":{"end":"2026-08-04T18:06:33Z","start":"2026-08-05T02:48:09Z"},"nautical":{"end":"2026-08-04T18:44:44Z","start":"2026-08-05T02:09:57Z"}},"window_end":"2026-08-05T09:00:00Z","window_start":"2026-08-04T09:00:00Z"},"night_date":"2026-08-04","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
