{"assessment":{"best_window":{"end":"2027-06-15T00:40Z","end_local":"03:40","hours":2.08,"label":"good","mean_quality":0.78,"start":"2027-06-14T22:35Z","start_local":"01:35"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":3.33,"moon":1.83},"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":"2027-06-14T18:00Z","label":"unusable","low":null,"mid":null,"moon_alt":29,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-14T19:00Z","label":"poor","low":null,"mid":null,"moon_alt":30,"precip":null,"q":0.07,"rh":null,"sky":"nautical twilight","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-14T20:00Z","label":"poor","low":null,"mid":null,"moon_alt":28,"precip":null,"q":0.25,"rh":null,"sky":"astronomical twilight","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-14T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":23,"precip":null,"q":0.53,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-14T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":16,"precip":null,"q":0.57,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-14T23:00Z","label":"good","low":null,"mid":null,"moon_alt":7,"precip":null,"q":0.62,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-15T00:00Z","label":"good","low":null,"mid":null,"moon_alt":-2,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-15T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-13,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-06-15T02:00Z","label":"poor","low":null,"mid":null,"moon_alt":-23,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"05:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":3.76,"reasons":["daylight and twilight cost 3.3 quality-hours","moonlight cost 1.8 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":94,"score_weather":null,"sky_hours":3.76,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-06-14T18:35Z","end_local":"21:35","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2027-06-14T17:55Z","start_local":"20:55"},{"end":"2027-06-14T20:10Z","end_local":"23:10","hours":1.58,"label":"poor","mean_quality":0.18,"start":"2027-06-14T18:35Z","start_local":"21:35"},{"end":"2027-06-14T22:35Z","end_local":"01:35","hours":2.42,"label":"marginal","mean_quality":0.55,"start":"2027-06-14T20:10Z","start_local":"23:10"},{"end":"2027-06-15T00:40Z","end_local":"03:40","hours":2.08,"label":"good","mean_quality":0.78,"start":"2027-06-14T22:35Z","start_local":"01:35"},{"end":"2027-06-15T01:30Z","end_local":"04:30","hours":0.83,"label":"marginal","mean_quality":0.5,"start":"2027-06-15T00:40Z","start_local":"03:40"},{"end":"2027-06-15T02:15Z","end_local":"05:15","hours":0.75,"label":"poor","mean_quality":0.15,"start":"2027-06-15T01:30Z","start_local":"04:30"},{"end":"2027-06-15T02:50Z","end_local":"05:50","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-06-15T02:15Z","start_local":"05:15"}]},"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":"2027-06-14T20:07:20Z","dark_hours":4.47,"dark_to":"2027-06-15T00:35:24Z","moon":{"illumination":0.839,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":0.83,"moonrise":"2027-06-14T13:51:05Z","moonset":"2027-06-14T23:44:40Z","sunrise":"2027-06-15T02:45:57Z","sunset":"2027-06-14T17:56:46Z","twilight":{"astronomical":{"end":"2027-06-14T20:07:20Z","start":"2027-06-15T00:35:24Z"},"civil":{"end":"2027-06-14T18:30:54Z","start":"2027-06-15T02:11:49Z"},"nautical":{"end":"2027-06-14T19:14:44Z","start":"2027-06-15T01:27:59Z"}},"window_end":"2027-06-15T09:00:00Z","window_start":"2027-06-14T09:00:00Z"},"night_date":"2027-06-14","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."]}