{"assessment":{"best_window":{"end":"2027-01-28T01:55Z","end_local":"03:55","hours":8.75,"label":"good","mean_quality":0.84,"start":"2027-01-27T17:10Z","start_local":"19:10"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.62,"moon":2.41},"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":"2027-01-27T16:00Z","label":"poor","low":null,"mid":null,"moon_alt":-55,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T17:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-48,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T18:00Z","label":"good","low":null,"mid":null,"moon_alt":-39,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T19:00Z","label":"good","low":null,"mid":null,"moon_alt":-29,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T20:00Z","label":"good","low":null,"mid":null,"moon_alt":-19,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T21:00Z","label":"good","low":null,"mid":null,"moon_alt":-8,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T22:00Z","label":"good","low":null,"mid":null,"moon_alt":2,"precip":null,"q":0.73,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-27T23:00Z","label":"good","low":null,"mid":null,"moon_alt":12,"precip":null,"q":0.68,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-28T00:00Z","label":"good","low":null,"mid":null,"moon_alt":21,"precip":null,"q":0.65,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-28T01:00Z","label":"good","low":null,"mid":null,"moon_alt":28,"precip":null,"q":0.62,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-28T02:00Z","label":"marginal","low":null,"mid":null,"moon_alt":33,"precip":null,"q":0.6,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-28T03:00Z","label":"marginal","low":null,"mid":null,"moon_alt":35,"precip":null,"q":0.59,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-28T04:00Z","label":"marginal","low":null,"mid":null,"moon_alt":33,"precip":null,"q":0.6,"rh":null,"sky":"night","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-28T05:00Z","label":"poor","low":null,"mid":null,"moon_alt":29,"precip":null,"q":0.09,"rh":null,"sky":"nautical twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":9.22,"reasons":["daylight and twilight cost 2.6 quality-hours","moonlight cost 2.4 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":9.22,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-01-27T16:00Z","end_local":"18:00","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-01-27T15:25Z","start_local":"17:25"},{"end":"2027-01-27T16:35Z","end_local":"18:35","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-01-27T16:00Z","start_local":"18:00"},{"end":"2027-01-27T17:10Z","end_local":"19:10","hours":0.58,"label":"marginal","mean_quality":0.5,"start":"2027-01-27T16:35Z","start_local":"18:35"},{"end":"2027-01-28T01:55Z","end_local":"03:55","hours":8.75,"label":"good","mean_quality":0.84,"start":"2027-01-27T17:10Z","start_local":"19:10"},{"end":"2027-01-28T04:05Z","end_local":"06:05","hours":2.17,"label":"marginal","mean_quality":0.59,"start":"2027-01-28T01:55Z","start_local":"03:55"},{"end":"2027-01-28T04:20Z","end_local":"06:20","hours":0.25,"label":"poor","mean_quality":0.3,"start":"2027-01-28T04:05Z","start_local":"06:05"},{"end":"2027-01-28T04:35Z","end_local":"06:35","hours":0.25,"label":"marginal","mean_quality":0.3,"start":"2027-01-28T04:20Z","start_local":"06:20"},{"end":"2027-01-28T05:10Z","end_local":"07:10","hours":0.58,"label":"poor","mean_quality":0.09,"start":"2027-01-28T04:35Z","start_local":"06:35"},{"end":"2027-01-28T05:40Z","end_local":"07:40","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-01-28T05:10Z","start_local":"07:10"}]},"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":"2027-01-27T17:05:58Z","dark_hours":10.92,"dark_to":"2027-01-28T04:01:16Z","moon":{"illumination":0.653,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":4.67,"moonrise":"2027-01-27T21:46:49Z","moonset":"2027-01-28T08:19:28Z","sunrise":"2027-01-28T05:37:18Z","sunset":"2027-01-27T15:29:42Z","twilight":{"astronomical":{"end":"2027-01-27T17:05:58Z","start":"2027-01-28T04:01:16Z"},"civil":{"end":"2027-01-27T15:59:32Z","start":"2027-01-28T05:07:33Z"},"nautical":{"end":"2027-01-27T16:33:08Z","start":"2027-01-28T04:34:02Z"}},"window_end":"2027-01-28T10:00:00Z","window_start":"2027-01-27T10:00:00Z"},"night_date":"2027-01-27","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."]}
