{"assessment":{"best_window":{"end":"2027-07-16T01:00Z","end_local":"04:00","hours":1.0,"label":"good","mean_quality":0.81,"start":"2027-07-16T00:00Z","start_local":"03:00"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":3.22,"moon":2.32},"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":"2027-07-15T18:00Z","label":"unusable","low":null,"mid":null,"moon_alt":14,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-15T19:00Z","label":"poor","low":null,"mid":null,"moon_alt":18,"precip":null,"q":0.08,"rh":null,"sky":"nautical twilight","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-15T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":20,"precip":null,"q":0.5,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-15T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":19,"precip":null,"q":0.5,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-15T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":16,"precip":null,"q":0.52,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-15T23:00Z","label":"marginal","low":null,"mid":null,"moon_alt":11,"precip":null,"q":0.56,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-16T00:00Z","label":"good","low":null,"mid":null,"moon_alt":4,"precip":null,"q":0.6,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-16T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-5,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-16T02:00Z","label":"poor","low":null,"mid":null,"moon_alt":-14,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-07-16T03:00Z","label":"unusable","low":null,"mid":null,"moon_alt":-24,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"06:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":3.71,"reasons":["daylight and twilight cost 3.2 quality-hours","moonlight cost 2.3 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":93,"score_weather":null,"sky_hours":3.71,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-07-15T18:30Z","end_local":"21:30","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2027-07-15T17:50Z","start_local":"20:50"},{"end":"2027-07-15T20:00Z","end_local":"23:00","hours":1.5,"label":"poor","mean_quality":0.17,"start":"2027-07-15T18:30Z","start_local":"21:30"},{"end":"2027-07-16T00:00Z","end_local":"03:00","hours":4.0,"label":"marginal","mean_quality":0.53,"start":"2027-07-15T20:00Z","start_local":"23:00"},{"end":"2027-07-16T01:00Z","end_local":"04:00","hours":1.0,"label":"good","mean_quality":0.81,"start":"2027-07-16T00:00Z","start_local":"03:00"},{"end":"2027-07-16T01:50Z","end_local":"04:50","hours":0.83,"label":"marginal","mean_quality":0.5,"start":"2027-07-16T01:00Z","start_local":"04:00"},{"end":"2027-07-16T02:30Z","end_local":"05:30","hours":0.67,"label":"poor","mean_quality":0.15,"start":"2027-07-16T01:50Z","start_local":"04:50"},{"end":"2027-07-16T03:05Z","end_local":"06:05","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-07-16T02:30Z","start_local":"05:30"}]},"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":"2027-07-15T19:57:37Z","dark_hours":4.99,"dark_to":"2027-07-16T00:56:50Z","moon":{"illumination":0.933,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":0.5,"moonrise":"2027-07-15T15:59:49Z","moonset":"2027-07-16T00:25:03Z","sunrise":"2027-07-16T03:00:12Z","sunset":"2027-07-15T17:54:15Z","twilight":{"astronomical":{"end":"2027-07-15T19:57:37Z","start":"2027-07-16T00:56:50Z"},"civil":{"end":"2027-07-15T18:27:16Z","start":"2027-07-16T02:27:11Z"},"nautical":{"end":"2027-07-15T19:09:03Z","start":"2027-07-16T01:45:24Z"}},"window_end":"2027-07-16T09:00:00Z","window_start":"2027-07-15T09:00:00Z"},"night_date":"2027-07-15","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."]}
