{"assessment":{"best_window":{"end":"2027-10-12T03:00Z","end_local":"06:00","hours":2.67,"label":"good","mean_quality":0.88,"start":"2027-10-12T00:20Z","start_local":"03:20"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.41,"moon":4.18},"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":"2027-10-11T16:00Z","label":"unusable","low":null,"mid":null,"moon_alt":21,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T17:00Z","label":"poor","low":null,"mid":null,"moon_alt":30,"precip":null,"q":0.24,"rh":null,"sky":"astronomical twilight","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T18:00Z","label":"marginal","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.45,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T19:00Z","label":"marginal","low":null,"mid":null,"moon_alt":40,"precip":null,"q":0.43,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":40,"precip":null,"q":0.43,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.45,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":30,"precip":null,"q":0.48,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-11T23:00Z","label":"marginal","low":null,"mid":null,"moon_alt":21,"precip":null,"q":0.53,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-12T00:00Z","label":"marginal","low":null,"mid":null,"moon_alt":12,"precip":null,"q":0.58,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-12T01:00Z","label":"good","low":null,"mid":null,"moon_alt":1,"precip":null,"q":0.64,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-12T02:00Z","label":"good","low":null,"mid":null,"moon_alt":-9,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-12T03:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-20,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-12T04:00Z","label":"poor","low":null,"mid":null,"moon_alt":-30,"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":6.16,"reasons":["moonlight cost 4.2 quality-hours","daylight and twilight cost 2.4 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":6.16,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-10-11T16:15Z","end_local":"19:15","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-10-11T15:45Z","start_local":"18:45"},{"end":"2027-10-11T17:20Z","end_local":"20:20","hours":1.08,"label":"poor","mean_quality":0.15,"start":"2027-10-11T16:15Z","start_local":"19:15"},{"end":"2027-10-12T00:20Z","end_local":"03:20","hours":7.0,"label":"marginal","mean_quality":0.47,"start":"2027-10-11T17:20Z","start_local":"20:20"},{"end":"2027-10-12T03:00Z","end_local":"06:00","hours":2.67,"label":"good","mean_quality":0.88,"start":"2027-10-12T00:20Z","start_local":"03:20"},{"end":"2027-10-12T03:30Z","end_local":"06:30","hours":0.5,"label":"marginal","mean_quality":0.5,"start":"2027-10-12T03:00Z","start_local":"06:00"},{"end":"2027-10-12T04:05Z","end_local":"07:05","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-10-12T03:30Z","start_local":"06:30"},{"end":"2027-10-12T04:30Z","end_local":"07:30","hours":0.42,"label":"unusable","mean_quality":0.0,"start":"2027-10-12T04:05Z","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":"2027-10-11T17:18:59Z","dark_hours":9.63,"dark_to":"2027-10-12T02:57:01Z","moon":{"illumination":0.872,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":1.83,"moonrise":"2027-10-11T13:53:17Z","moonset":"2027-10-12T01:06:08Z","sunrise":"2027-10-12T04:29:21Z","sunset":"2027-10-11T15:46:50Z","twilight":{"astronomical":{"end":"2027-10-11T17:18:59Z","start":"2027-10-12T02:57:01Z"},"civil":{"end":"2027-10-11T16:14:40Z","start":"2027-10-12T04:01:27Z"},"nautical":{"end":"2027-10-11T16:46:48Z","start":"2027-10-12T03:29:16Z"}},"window_end":"2027-10-12T09:00:00Z","window_start":"2027-10-11T09:00:00Z"},"night_date":"2027-10-11","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."]}