{"assessment":{"best_window":{"end":"2027-04-06T02:20Z","end_local":"05:20","hours":7.83,"label":"good","mean_quality":1.0,"start":"2027-04-05T18:30Z","start_local":"21:30"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.58,"moon":0.0},"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":"2027-04-05T17:00Z","label":"unusable","low":null,"mid":null,"moon_alt":-17,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-05T18:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-27,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-05T19:00Z","label":"good","low":null,"mid":null,"moon_alt":-35,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-05T20:00Z","label":"good","low":null,"mid":null,"moon_alt":-41,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-05T21:00Z","label":"good","low":null,"mid":null,"moon_alt":-44,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-05T22:00Z","label":"good","low":null,"mid":null,"moon_alt":-44,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-05T23:00Z","label":"good","low":null,"mid":null,"moon_alt":-40,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-06T00:00Z","label":"good","low":null,"mid":null,"moon_alt":-34,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-06T01:00Z","label":"good","low":null,"mid":null,"moon_alt":-25,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-06T02:00Z","label":"good","low":null,"mid":null,"moon_alt":-15,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-04-06T03:00Z","label":"poor","low":null,"mid":null,"moon_alt":-4,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"06:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":8.59,"reasons":["daylight and twilight cost 2.6 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":8.59,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-04-05T17:20Z","end_local":"20:20","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-04-05T16:50Z","start_local":"19:50"},{"end":"2027-04-05T17:55Z","end_local":"20:55","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-04-05T17:20Z","start_local":"20:20"},{"end":"2027-04-05T18:30Z","end_local":"21:30","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2027-04-05T17:55Z","start_local":"20:55"},{"end":"2027-04-06T02:20Z","end_local":"05:20","hours":7.83,"label":"good","mean_quality":1.0,"start":"2027-04-05T18:30Z","start_local":"21:30"},{"end":"2027-04-06T02:55Z","end_local":"05:55","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2027-04-06T02:20Z","start_local":"05:20"},{"end":"2027-04-06T03:30Z","end_local":"06:30","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-04-06T02:55Z","start_local":"05:55"},{"end":"2027-04-06T04:00Z","end_local":"07:00","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-04-06T03:30Z","start_local":"06:30"}]},"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":"2027-04-05T18:27:11Z","dark_hours":7.87,"dark_to":"2027-04-06T02:19:38Z","moon":{"illumination":0.014,"phase":"new moon","waxing":false},"moon_free_dark_hours":7.85,"moonrise":"2027-04-06T03:24:50Z","moonset":"2027-04-05T15:21:59Z","sunrise":"2027-04-06T03:56:22Z","sunset":"2027-04-05T16:50:22Z","twilight":{"astronomical":{"end":"2027-04-05T18:27:11Z","start":"2027-04-06T02:19:38Z"},"civil":{"end":"2027-04-05T17:18:38Z","start":"2027-04-06T03:28:07Z"},"nautical":{"end":"2027-04-05T17:52:14Z","start":"2027-04-06T02:54:33Z"}},"window_end":"2027-04-06T09:00:00Z","window_start":"2027-04-05T09:00:00Z"},"night_date":"2027-04-05","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."]}
