{"assessment":{"best_window":{"end":"2028-02-02T04:00Z","end_local":"06:00","hours":10.75,"label":"good","mean_quality":0.93,"start":"2028-02-01T17:15Z","start_local":"19:15"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.52,"moon":0.81},"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":"Astronomically worth it \u2014 weather unknown","hourly":[{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T16:00Z","label":"unusable","low":null,"mid":null,"moon_alt":54,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T17:00Z","label":"marginal","low":null,"mid":null,"moon_alt":46,"precip":null,"q":0.39,"rh":null,"sky":"astronomical twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T18:00Z","label":"good","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.8,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T19:00Z","label":"good","low":null,"mid":null,"moon_alt":26,"precip":null,"q":0.82,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T20:00Z","label":"good","low":null,"mid":null,"moon_alt":15,"precip":null,"q":0.84,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T21:00Z","label":"good","low":null,"mid":null,"moon_alt":4,"precip":null,"q":0.86,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T22:00Z","label":"good","low":null,"mid":null,"moon_alt":-6,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-01T23:00Z","label":"good","low":null,"mid":null,"moon_alt":-15,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-02T00:00Z","label":"good","low":null,"mid":null,"moon_alt":-24,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-02T01:00Z","label":"good","low":null,"mid":null,"moon_alt":-30,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-02T02:00Z","label":"good","low":null,"mid":null,"moon_alt":-34,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-02T03:00Z","label":"good","low":null,"mid":null,"moon_alt":-35,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-02T04:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-33,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2028-02-02T05:00Z","label":"poor","low":null,"mid":null,"moon_alt":-28,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":10.68,"reasons":["daylight and twilight cost 2.5 quality-hours","moonlight cost 0.8 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":10.68,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2028-02-01T16:10Z","end_local":"18:10","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2028-02-01T15:35Z","start_local":"17:35"},{"end":"2028-02-01T16:40Z","end_local":"18:40","hours":0.5,"label":"poor","mean_quality":0.12,"start":"2028-02-01T16:10Z","start_local":"18:10"},{"end":"2028-02-01T17:15Z","end_local":"19:15","hours":0.58,"label":"marginal","mean_quality":0.39,"start":"2028-02-01T16:40Z","start_local":"18:40"},{"end":"2028-02-02T04:00Z","end_local":"06:00","hours":10.75,"label":"good","mean_quality":0.93,"start":"2028-02-01T17:15Z","start_local":"19:15"},{"end":"2028-02-02T04:35Z","end_local":"06:35","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2028-02-02T04:00Z","start_local":"06:00"},{"end":"2028-02-02T05:05Z","end_local":"07:05","hours":0.5,"label":"poor","mean_quality":0.15,"start":"2028-02-02T04:35Z","start_local":"06:35"},{"end":"2028-02-02T05:35Z","end_local":"07:35","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2028-02-02T05:05Z","start_local":"07:05"}]},"calculation_version":"2026-10-10.1","forecast":[],"forecast_source":"none","forecast_updated_at":null,"limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2028-02-01T17:11:11Z","dark_hours":10.77,"dark_to":"2028-02-02T03:57:34Z","moon":{"illumination":0.318,"phase":"waxing crescent","waxing":true},"moon_free_dark_hours":6.55,"moonrise":"2028-02-02T08:12:50Z","moonset":"2028-02-01T21:23:34Z","sunrise":"2028-02-02T05:32:47Z","sunset":"2028-02-01T15:35:45Z","twilight":{"astronomical":{"end":"2028-02-01T17:11:11Z","start":"2028-02-02T03:57:34Z"},"civil":{"end":"2028-02-01T16:05:14Z","start":"2028-02-02T05:03:23Z"},"nautical":{"end":"2028-02-01T16:38:32Z","start":"2028-02-02T04:30:09Z"}},"window_end":"2028-02-02T10:00:00Z","window_start":"2028-02-01T10:00:00Z"},"night_date":"2028-02-01","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":["No cloud data for this night (beyond the 4-day forecast, or not yet in the archive) \u2014 the score is geometry only."]}
