{"assessment":{"best_window":{"end":"2026-03-16T03:00Z","end_local":"05:00","hours":8.92,"label":"good","mean_quality":0.91,"start":"2026-03-15T18:05Z","start_local":"20:05"},"cost":{"altitude":0.0,"clouds":0.82,"darkness":2.52,"moon":0.01},"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":"2026-03-15T17:00Z","label":"poor","low":0,"mid":0,"moon_alt":-47,"precip":0.0,"q":0.15,"rh":75,"sky":"nautical twilight","temp":-4.2,"time":"19:00","wind":0.9},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-15T18:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-57,"precip":0.0,"q":0.5,"rh":80,"sky":"astronomical twilight","temp":-4.5,"time":"20:00","wind":1.1},{"alt":null,"cloud":4,"high":0,"iso":"2026-03-15T19:00Z","label":"good","low":4,"mid":0,"moon_alt":-64,"precip":0.0,"q":0.96,"rh":80,"sky":"night","temp":-4.8,"time":"21:00","wind":2.2},{"alt":null,"cloud":15,"high":0,"iso":"2026-03-15T20:00Z","label":"good","low":15,"mid":0,"moon_alt":-67,"precip":0.0,"q":0.83,"rh":81,"sky":"night","temp":-4.7,"time":"22:00","wind":2.2},{"alt":null,"cloud":24,"high":0,"iso":"2026-03-15T21:00Z","label":"good","low":24,"mid":0,"moon_alt":-64,"precip":0.0,"q":0.73,"rh":84,"sky":"night","temp":-4.5,"time":"23:00","wind":1.9},{"alt":null,"cloud":13,"high":0,"iso":"2026-03-15T22:00Z","label":"good","low":13,"mid":0,"moon_alt":-56,"precip":0.0,"q":0.86,"rh":85,"sky":"night","temp":-3.9,"time":"00:00","wind":1.3},{"alt":null,"cloud":18,"high":0,"iso":"2026-03-15T23:00Z","label":"good","low":18,"mid":0,"moon_alt":-47,"precip":0.0,"q":0.8,"rh":85,"sky":"night","temp":-3.6,"time":"01:00","wind":0.4},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-16T00:00Z","label":"good","low":0,"mid":0,"moon_alt":-36,"precip":0.0,"q":1.0,"rh":80,"sky":"night","temp":-4.4,"time":"02:00","wind":2.0},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-16T01:00Z","label":"good","low":0,"mid":0,"moon_alt":-25,"precip":0.0,"q":1.0,"rh":82,"sky":"night","temp":-5.0,"time":"03:00","wind":3.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-16T02:00Z","label":"good","low":0,"mid":0,"moon_alt":-14,"precip":0.0,"q":1.0,"rh":83,"sky":"night","temp":-5.3,"time":"04:00","wind":3.6},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-16T03:00Z","label":"marginal","low":0,"mid":0,"moon_alt":-4,"precip":0.0,"q":0.5,"rh":83,"sky":"astronomical twilight","temp":-5.7,"time":"05:00","wind":3.5},{"alt":null,"cloud":0,"high":0,"iso":"2026-03-16T04:00Z","label":"poor","low":0,"mid":0,"moon_alt":6,"precip":0.0,"q":0.14,"rh":82,"sky":"nautical twilight","temp":-5.9,"time":"06:00","wind":3.1}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":8.82,"reasons":["daylight and twilight cost 2.5 quality-hours","cloud cover cost 0.8 quality-hours"],"reference_hours":4.0,"score":91,"score_astronomy":100,"score_weather":91,"sky_hours":9.64,"verdict":"good","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2026-03-15T17:00Z","end_local":"19:00","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2026-03-15T16:25Z","start_local":"18:25"},{"end":"2026-03-15T17:30Z","end_local":"19:30","hours":0.5,"label":"poor","mean_quality":0.15,"start":"2026-03-15T17:00Z","start_local":"19:00"},{"end":"2026-03-15T18:05Z","end_local":"20:05","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2026-03-15T17:30Z","start_local":"19:30"},{"end":"2026-03-16T03:00Z","end_local":"05:00","hours":8.92,"label":"good","mean_quality":0.91,"start":"2026-03-15T18:05Z","start_local":"20:05"},{"end":"2026-03-16T03:35Z","end_local":"05:35","hours":0.58,"label":"marginal","mean_quality":0.49,"start":"2026-03-16T03:00Z","start_local":"05:00"},{"end":"2026-03-16T04:05Z","end_local":"06:05","hours":0.5,"label":"poor","mean_quality":0.14,"start":"2026-03-16T03:35Z","start_local":"05:35"},{"end":"2026-03-16T04:35Z","end_local":"06:35","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2026-03-16T04:05Z","start_local":"06:05"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":0,"dark":false,"high":0,"local":"18:00","low":0,"mid":0,"precip":0.0,"rh":69,"temp":-2.0,"time":"2026-03-15T16:00Z","wind":3.6},{"cloud":0,"dark":false,"high":0,"local":"19:00","low":0,"mid":0,"precip":0.0,"rh":75,"temp":-4.2,"time":"2026-03-15T17:00Z","wind":0.9},{"cloud":0,"dark":false,"high":0,"local":"20:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":-4.5,"time":"2026-03-15T18:00Z","wind":1.1},{"cloud":4,"dark":true,"high":0,"local":"21:00","low":4,"mid":0,"precip":0.0,"rh":80,"temp":-4.8,"time":"2026-03-15T19:00Z","wind":2.2},{"cloud":15,"dark":true,"high":0,"local":"22:00","low":15,"mid":0,"precip":0.0,"rh":81,"temp":-4.7,"time":"2026-03-15T20:00Z","wind":2.2},{"cloud":24,"dark":true,"high":0,"local":"23:00","low":24,"mid":0,"precip":0.0,"rh":84,"temp":-4.5,"time":"2026-03-15T21:00Z","wind":1.9},{"cloud":13,"dark":true,"high":0,"local":"00:00","low":13,"mid":0,"precip":0.0,"rh":85,"temp":-3.9,"time":"2026-03-15T22:00Z","wind":1.3},{"cloud":18,"dark":true,"high":0,"local":"01:00","low":18,"mid":0,"precip":0.0,"rh":85,"temp":-3.6,"time":"2026-03-15T23:00Z","wind":0.4},{"cloud":0,"dark":true,"high":0,"local":"02:00","low":0,"mid":0,"precip":0.0,"rh":80,"temp":-4.4,"time":"2026-03-16T00:00Z","wind":2.0},{"cloud":0,"dark":true,"high":0,"local":"03:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":-5.0,"time":"2026-03-16T01:00Z","wind":3.5},{"cloud":0,"dark":true,"high":0,"local":"04:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":-5.3,"time":"2026-03-16T02:00Z","wind":3.6},{"cloud":0,"dark":false,"high":0,"local":"05:00","low":0,"mid":0,"precip":0.0,"rh":83,"temp":-5.7,"time":"2026-03-16T03:00Z","wind":3.5},{"cloud":0,"dark":false,"high":0,"local":"06:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":-5.9,"time":"2026-03-16T04:00Z","wind":3.1},{"cloud":0,"dark":false,"high":0,"local":"07:00","low":0,"mid":0,"precip":0.0,"rh":82,"temp":-5.4,"time":"2026-03-16T05:00Z","wind":2.6}],"forecast_source":"history","forecast_updated_at":"2026-10-15T23:12:08Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2026-03-15T18:00:15Z","dark_hours":8.98,"dark_to":"2026-03-16T02:58:50Z","moon":{"illumination":0.111,"phase":"waning crescent","waxing":false},"moon_free_dark_hours":8.95,"moonrise":"2026-03-16T03:23:13Z","moonset":"2026-03-15T12:24:23Z","sunrise":"2026-03-16T04:31:31Z","sunset":"2026-03-15T16:27:25Z","twilight":{"astronomical":{"end":"2026-03-15T18:00:15Z","start":"2026-03-16T02:58:50Z"},"civil":{"end":"2026-03-15T16:55:08Z","start":"2026-03-16T04:03:52Z"},"nautical":{"end":"2026-03-15T17:27:27Z","start":"2026-03-16T03:31:35Z"}},"window_end":"2026-03-16T10:00:00Z","window_start":"2026-03-15T10:00:00Z"},"night_date":"2026-03-15","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
