{"assessment":{"best_window":{"end":"2027-12-04T03:55Z","end_local":"05:55","hours":11.33,"label":"good","mean_quality":0.96,"start":"2027-12-03T16:35Z","start_local":"18:35"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.66,"moon":0.52},"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":"2027-12-03T15:00Z","label":"unusable","low":null,"mid":null,"moon_alt":31,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"17:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T16:00Z","label":"marginal","low":null,"mid":null,"moon_alt":28,"precip":null,"q":0.41,"rh":null,"sky":"astronomical twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T17:00Z","label":"good","low":null,"mid":null,"moon_alt":23,"precip":null,"q":0.84,"rh":null,"sky":"night","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T18:00Z","label":"good","low":null,"mid":null,"moon_alt":15,"precip":null,"q":0.85,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T19:00Z","label":"good","low":null,"mid":null,"moon_alt":7,"precip":null,"q":0.87,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T20:00Z","label":"good","low":null,"mid":null,"moon_alt":-3,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T21:00Z","label":"good","low":null,"mid":null,"moon_alt":-14,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T22:00Z","label":"good","low":null,"mid":null,"moon_alt":-24,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-03T23:00Z","label":"good","low":null,"mid":null,"moon_alt":-35,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-04T00:00Z","label":"good","low":null,"mid":null,"moon_alt":-45,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-04T01:00Z","label":"good","low":null,"mid":null,"moon_alt":-54,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-04T02:00Z","label":"good","low":null,"mid":null,"moon_alt":-61,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-04T03:00Z","label":"good","low":null,"mid":null,"moon_alt":-63,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-04T04:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-59,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-12-04T05:00Z","label":"poor","low":null,"mid":null,"moon_alt":-52,"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":11.57,"reasons":["daylight and twilight cost 2.7 quality-hours","moonlight cost 0.5 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":11.57,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-12-03T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-12-03T14:50Z","start_local":"16:50"},{"end":"2027-12-03T16:00Z","end_local":"18:00","hours":0.58,"label":"poor","mean_quality":0.12,"start":"2027-12-03T15:25Z","start_local":"17:25"},{"end":"2027-12-03T16:35Z","end_local":"18:35","hours":0.58,"label":"marginal","mean_quality":0.42,"start":"2027-12-03T16:00Z","start_local":"18:00"},{"end":"2027-12-04T03:55Z","end_local":"05:55","hours":11.33,"label":"good","mean_quality":0.96,"start":"2027-12-03T16:35Z","start_local":"18:35"},{"end":"2027-12-04T04:30Z","end_local":"06:30","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2027-12-04T03:55Z","start_local":"05:55"},{"end":"2027-12-04T05:05Z","end_local":"07:05","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-12-04T04:30Z","start_local":"06:30"},{"end":"2027-12-04T05:35Z","end_local":"07:35","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-12-04T05:05Z","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":"2027-12-03T16:30:13Z","dark_hours":11.36,"dark_to":"2027-12-04T03:51:50Z","moon":{"illumination":0.29,"phase":"waxing crescent","waxing":true},"moon_free_dark_hours":8.18,"moonrise":"2027-12-04T09:57:23Z","moonset":"2027-12-03T19:39:20Z","sunrise":"2027-12-04T05:31:10Z","sunset":"2027-12-03T14:51:02Z","twilight":{"astronomical":{"end":"2027-12-03T16:30:13Z","start":"2027-12-04T03:51:50Z"},"civil":{"end":"2027-12-03T15:22:05Z","start":"2027-12-04T05:00:03Z"},"nautical":{"end":"2027-12-03T15:56:41Z","start":"2027-12-04T04:25:24Z"}},"window_end":"2027-12-04T10:00:00Z","window_start":"2027-12-03T10:00:00Z"},"night_date":"2027-12-03","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."]}
