{"assessment":{"best_window":{"end":"2027-06-12T00:40Z","end_local":"03:40","hours":4.5,"label":"good","mean_quality":0.86,"start":"2027-06-11T20:10Z","start_local":"23:10"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":3.32,"moon":0.84},"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":"2027-06-11T18:00Z","label":"unusable","low":null,"mid":null,"moon_alt":43,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-11T19:00Z","label":"poor","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.1,"rh":null,"sky":"nautical twilight","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-11T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":27,"precip":null,"q":0.34,"rh":null,"sky":"astronomical twilight","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-11T21:00Z","label":"good","low":null,"mid":null,"moon_alt":17,"precip":null,"q":0.72,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-11T22:00Z","label":"good","low":null,"mid":null,"moon_alt":6,"precip":null,"q":0.76,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-11T23:00Z","label":"good","low":null,"mid":null,"moon_alt":-5,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-12T00:00Z","label":"good","low":null,"mid":null,"moon_alt":-16,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-12T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-27,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-12T02:00Z","label":"poor","low":null,"mid":null,"moon_alt":-36,"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":4.76,"reasons":["daylight and twilight cost 3.3 quality-hours","moonlight cost 0.8 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":4.76,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-06-11T18:30Z","end_local":"21:30","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-06-11T17:55Z","start_local":"20:55"},{"end":"2027-06-11T19:15Z","end_local":"22:15","hours":0.75,"label":"poor","mean_quality":0.1,"start":"2027-06-11T18:30Z","start_local":"21:30"},{"end":"2027-06-11T20:10Z","end_local":"23:10","hours":0.92,"label":"marginal","mean_quality":0.33,"start":"2027-06-11T19:15Z","start_local":"22:15"},{"end":"2027-06-12T00:40Z","end_local":"03:40","hours":4.5,"label":"good","mean_quality":0.86,"start":"2027-06-11T20:10Z","start_local":"23:10"},{"end":"2027-06-12T01:30Z","end_local":"04:30","hours":0.83,"label":"marginal","mean_quality":0.5,"start":"2027-06-12T00:40Z","start_local":"03:40"},{"end":"2027-06-12T02:15Z","end_local":"05:15","hours":0.75,"label":"poor","mean_quality":0.15,"start":"2027-06-12T01:30Z","start_local":"04:30"},{"end":"2027-06-12T02:50Z","end_local":"05:50","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-06-12T02:15Z","start_local":"05:15"}]},"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":"2027-06-11T20:05:11Z","dark_hours":4.52,"dark_to":"2027-06-12T00:36:16Z","moon":{"illumination":0.552,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":2.08,"moonrise":"2027-06-11T10:23:02Z","moonset":"2027-06-11T22:30:46Z","sunrise":"2027-06-12T02:46:05Z","sunset":"2027-06-11T17:55:21Z","twilight":{"astronomical":{"end":"2027-06-11T20:05:11Z","start":"2027-06-12T00:36:16Z"},"civil":{"end":"2027-06-11T18:29:22Z","start":"2027-06-12T02:12:04Z"},"nautical":{"end":"2027-06-11T19:13:00Z","start":"2027-06-12T01:28:26Z"}},"window_end":"2027-06-12T09:00:00Z","window_start":"2027-06-11T09:00:00Z"},"night_date":"2027-06-11","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."]}
