{"assessment":{"best_window":{"end":"2027-03-17T03:00Z","end_local":"05:00","hours":4.92,"label":"good","mean_quality":0.78,"start":"2027-03-16T22:05Z","start_local":"00:05"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.52,"moon":3.12},"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":"2027-03-16T17:00Z","label":"poor","low":null,"mid":null,"moon_alt":74,"precip":null,"q":0.07,"rh":null,"sky":"nautical twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-16T18:00Z","label":"poor","low":null,"mid":null,"moon_alt":73,"precip":null,"q":0.25,"rh":null,"sky":"astronomical twilight","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-16T19:00Z","label":"marginal","low":null,"mid":null,"moon_alt":66,"precip":null,"q":0.51,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-16T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":56,"precip":null,"q":0.53,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-16T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":45,"precip":null,"q":0.56,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-16T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":34,"precip":null,"q":0.6,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-16T23:00Z","label":"good","low":null,"mid":null,"moon_alt":23,"precip":null,"q":0.64,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-17T00:00Z","label":"good","low":null,"mid":null,"moon_alt":13,"precip":null,"q":0.69,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-17T01:00Z","label":"good","low":null,"mid":null,"moon_alt":3,"precip":null,"q":0.73,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-17T02:00Z","label":"good","low":null,"mid":null,"moon_alt":-5,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-17T03:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-13,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-17T04:00Z","label":"poor","low":null,"mid":null,"moon_alt":-19,"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":6.53,"reasons":["moonlight cost 3.1 quality-hours","daylight and twilight cost 2.5 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":6.53,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-03-16T17:00Z","end_local":"19:00","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-03-16T16:25Z","start_local":"18:25"},{"end":"2027-03-16T18:05Z","end_local":"20:05","hours":1.08,"label":"poor","mean_quality":0.17,"start":"2027-03-16T17:00Z","start_local":"19:00"},{"end":"2027-03-16T22:05Z","end_local":"00:05","hours":4.0,"label":"marginal","mean_quality":0.54,"start":"2027-03-16T18:05Z","start_local":"20:05"},{"end":"2027-03-17T03:00Z","end_local":"05:00","hours":4.92,"label":"good","mean_quality":0.78,"start":"2027-03-16T22:05Z","start_local":"00:05"},{"end":"2027-03-17T03:35Z","end_local":"05:35","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2027-03-17T03:00Z","start_local":"05:00"},{"end":"2027-03-17T04:05Z","end_local":"06:05","hours":0.5,"label":"poor","mean_quality":0.15,"start":"2027-03-17T03:35Z","start_local":"05:35"},{"end":"2027-03-17T04:35Z","end_local":"06:35","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-03-17T04:05Z","start_local":"06:05"}]},"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":"2027-03-16T18:01:11Z","dark_hours":8.94,"dark_to":"2027-03-17T02:57:29Z","moon":{"illumination":0.641,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":1.58,"moonrise":null,"moonset":"2027-03-17T01:21:21Z","sunrise":"2027-03-17T04:30:14Z","sunset":"2027-03-16T16:28:17Z","twilight":{"astronomical":{"end":"2027-03-16T18:01:11Z","start":"2027-03-17T02:57:29Z"},"civil":{"end":"2027-03-16T16:55:59Z","start":"2027-03-17T04:02:35Z"},"nautical":{"end":"2027-03-16T17:28:20Z","start":"2027-03-17T03:30:17Z"}},"window_end":"2027-03-17T10:00:00Z","window_start":"2027-03-16T10:00:00Z"},"night_date":"2027-03-16","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."]}