{"assessment":{"best_window":{"end":"2027-10-25T03:15Z","end_local":"06:15","hours":10.25,"label":"good","mean_quality":0.96,"start":"2027-10-24T17:00Z","start_local":"20:00"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.42,"moon":0.51},"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":"2027-10-24T16:00Z","label":"poor","low":null,"mid":null,"moon_alt":-31,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T17:00Z","label":"good","low":null,"mid":null,"moon_alt":-36,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T18:00Z","label":"good","low":null,"mid":null,"moon_alt":-38,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T19:00Z","label":"good","low":null,"mid":null,"moon_alt":-37,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T20:00Z","label":"good","low":null,"mid":null,"moon_alt":-33,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T21:00Z","label":"good","low":null,"mid":null,"moon_alt":-27,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T22:00Z","label":"good","low":null,"mid":null,"moon_alt":-18,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-24T23:00Z","label":"good","low":null,"mid":null,"moon_alt":-9,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-25T00:00Z","label":"good","low":null,"mid":null,"moon_alt":2,"precip":null,"q":0.89,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-25T01:00Z","label":"good","low":null,"mid":null,"moon_alt":12,"precip":null,"q":0.87,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-25T02:00Z","label":"good","low":null,"mid":null,"moon_alt":23,"precip":null,"q":0.86,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-25T03:00Z","label":"good","low":null,"mid":null,"moon_alt":33,"precip":null,"q":0.84,"rh":null,"sky":"night","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-10-25T04:00Z","label":"poor","low":null,"mid":null,"moon_alt":43,"precip":null,"q":0.12,"rh":null,"sky":"nautical twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":10.4,"reasons":["daylight and twilight cost 2.4 quality-hours","moonlight cost 0.5 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":10.4,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-10-24T16:00Z","end_local":"19:00","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-10-24T15:25Z","start_local":"18:25"},{"end":"2027-10-24T16:30Z","end_local":"19:30","hours":0.5,"label":"poor","mean_quality":0.15,"start":"2027-10-24T16:00Z","start_local":"19:00"},{"end":"2027-10-24T17:00Z","end_local":"20:00","hours":0.5,"label":"marginal","mean_quality":0.5,"start":"2027-10-24T16:30Z","start_local":"19:30"},{"end":"2027-10-25T03:15Z","end_local":"06:15","hours":10.25,"label":"good","mean_quality":0.96,"start":"2027-10-24T17:00Z","start_local":"20:00"},{"end":"2027-10-25T03:45Z","end_local":"06:45","hours":0.5,"label":"marginal","mean_quality":0.42,"start":"2027-10-25T03:15Z","start_local":"06:15"},{"end":"2027-10-25T04:20Z","end_local":"07:20","hours":0.58,"label":"poor","mean_quality":0.12,"start":"2027-10-25T03:45Z","start_local":"06:45"},{"end":"2027-10-25T04:45Z","end_local":"07:45","hours":0.42,"label":"unusable","mean_quality":0.0,"start":"2027-10-25T04:20Z","start_local":"07:20"}]},"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":"2027-10-24T16:59:52Z","dark_hours":10.19,"dark_to":"2027-10-25T03:11:05Z","moon":{"illumination":0.259,"phase":"waning crescent","waxing":false},"moon_free_dark_hours":6.85,"moonrise":"2027-10-24T23:51:00Z","moonset":"2027-10-24T12:32:55Z","sunrise":"2027-10-25T04:44:15Z","sunset":"2027-10-24T15:26:55Z","twilight":{"astronomical":{"end":"2027-10-24T16:59:52Z","start":"2027-10-25T03:11:05Z"},"civil":{"end":"2027-10-24T15:55:17Z","start":"2027-10-25T04:15:48Z"},"nautical":{"end":"2027-10-24T16:27:42Z","start":"2027-10-25T03:43:18Z"}},"window_end":"2027-10-25T09:00:00Z","window_start":"2027-10-24T09:00:00Z"},"night_date":"2027-10-24","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."]}
