{"assessment":{"best_window":{"end":"2027-07-12T00:55Z","end_local":"03:55","hours":4.83,"label":"good","mean_quality":0.9,"start":"2027-07-11T20:05Z","start_local":"23:05"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":3.2,"moon":0.68},"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":"2027-07-11T18:00Z","label":"unusable","low":null,"mid":null,"moon_alt":29,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-11T19:00Z","label":"poor","low":null,"mid":null,"moon_alt":24,"precip":null,"q":0.1,"rh":null,"sky":"nautical twilight","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-11T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":17,"precip":null,"q":0.34,"rh":null,"sky":"astronomical twilight","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-11T21:00Z","label":"good","low":null,"mid":null,"moon_alt":8,"precip":null,"q":0.72,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-11T22:00Z","label":"good","low":null,"mid":null,"moon_alt":-2,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-11T23:00Z","label":"good","low":null,"mid":null,"moon_alt":-12,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-12T00:00Z","label":"good","low":null,"mid":null,"moon_alt":-23,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-12T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-34,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-12T02:00Z","label":"poor","low":null,"mid":null,"moon_alt":-45,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"05:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.2,"reasons":["daylight and twilight cost 3.2 quality-hours","moonlight cost 0.7 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":5.2,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-07-11T18:30Z","end_local":"21:30","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-07-11T17:55Z","start_local":"20:55"},{"end":"2027-07-11T19:15Z","end_local":"22:15","hours":0.75,"label":"poor","mean_quality":0.1,"start":"2027-07-11T18:30Z","start_local":"21:30"},{"end":"2027-07-11T20:05Z","end_local":"23:05","hours":0.83,"label":"marginal","mean_quality":0.33,"start":"2027-07-11T19:15Z","start_local":"22:15"},{"end":"2027-07-12T00:55Z","end_local":"03:55","hours":4.83,"label":"good","mean_quality":0.9,"start":"2027-07-11T20:05Z","start_local":"23:05"},{"end":"2027-07-12T01:45Z","end_local":"04:45","hours":0.83,"label":"marginal","mean_quality":0.5,"start":"2027-07-12T00:55Z","start_local":"03:55"},{"end":"2027-07-12T02:25Z","end_local":"05:25","hours":0.67,"label":"poor","mean_quality":0.15,"start":"2027-07-12T01:45Z","start_local":"04:45"},{"end":"2027-07-12T03:00Z","end_local":"06:00","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-07-12T02:25Z","start_local":"05:25"}]},"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":"2027-07-11T20:01:55Z","dark_hours":4.83,"dark_to":"2027-07-12T00:51:34Z","moon":{"illumination":0.621,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":3.05,"moonrise":"2027-07-11T11:42:42Z","moonset":"2027-07-11T21:47:44Z","sunrise":"2027-07-12T02:57:04Z","sunset":"2027-07-11T17:56:26Z","twilight":{"astronomical":{"end":"2027-07-11T20:01:55Z","start":"2027-07-12T00:51:34Z"},"civil":{"end":"2027-07-11T18:29:47Z","start":"2027-07-12T02:23:43Z"},"nautical":{"end":"2027-07-11T19:12:12Z","start":"2027-07-12T01:41:18Z"}},"window_end":"2027-07-12T09:00:00Z","window_start":"2027-07-11T09:00:00Z"},"night_date":"2027-07-11","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."]}