{"assessment":{"best_window":{"end":"2027-01-20T04:10Z","end_local":"06:10","hours":0.92,"label":"good","mean_quality":0.72,"start":"2027-01-20T03:15Z","start_local":"05:15"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.63,"moon":6.83},"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":"2027-01-19T16:00Z","label":"poor","low":null,"mid":null,"moon_alt":43,"precip":null,"q":0.06,"rh":null,"sky":"nautical twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T17:00Z","label":"marginal","low":null,"mid":null,"moon_alt":54,"precip":null,"q":0.35,"rh":null,"sky":"night","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T18:00Z","label":"marginal","low":null,"mid":null,"moon_alt":64,"precip":null,"q":0.31,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T19:00Z","label":"poor","low":null,"mid":null,"moon_alt":73,"precip":null,"q":0.3,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T20:00Z","label":"poor","low":null,"mid":null,"moon_alt":76,"precip":null,"q":0.29,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":70,"precip":null,"q":0.3,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":60,"precip":null,"q":0.33,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-19T23:00Z","label":"marginal","low":null,"mid":null,"moon_alt":49,"precip":null,"q":0.37,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-20T00:00Z","label":"marginal","low":null,"mid":null,"moon_alt":39,"precip":null,"q":0.41,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-20T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":28,"precip":null,"q":0.47,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-20T02:00Z","label":"marginal","low":null,"mid":null,"moon_alt":18,"precip":null,"q":0.53,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-20T03:00Z","label":"marginal","low":null,"mid":null,"moon_alt":8,"precip":null,"q":0.59,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-20T04:00Z","label":"good","low":null,"mid":null,"moon_alt":-1,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-20T05:00Z","label":"poor","low":null,"mid":null,"moon_alt":-9,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":5.04,"reasons":["moonlight cost 6.8 quality-hours","daylight and twilight cost 2.6 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":5.04,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-01-19T15:55Z","end_local":"17:55","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2027-01-19T15:15Z","start_local":"17:15"},{"end":"2027-01-19T17:00Z","end_local":"19:00","hours":1.08,"label":"poor","mean_quality":0.12,"start":"2027-01-19T15:55Z","start_local":"17:55"},{"end":"2027-01-19T18:40Z","end_local":"20:40","hours":1.67,"label":"marginal","mean_quality":0.32,"start":"2027-01-19T17:00Z","start_local":"19:00"},{"end":"2027-01-19T20:55Z","end_local":"22:55","hours":2.25,"label":"poor","mean_quality":0.29,"start":"2027-01-19T18:40Z","start_local":"20:40"},{"end":"2027-01-20T03:15Z","end_local":"05:15","hours":6.33,"label":"marginal","mean_quality":0.43,"start":"2027-01-19T20:55Z","start_local":"22:55"},{"end":"2027-01-20T04:10Z","end_local":"06:10","hours":0.92,"label":"good","mean_quality":0.72,"start":"2027-01-20T03:15Z","start_local":"05:15"},{"end":"2027-01-20T04:40Z","end_local":"06:40","hours":0.5,"label":"marginal","mean_quality":0.5,"start":"2027-01-20T04:10Z","start_local":"06:10"},{"end":"2027-01-20T05:15Z","end_local":"07:15","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-01-20T04:40Z","start_local":"06:40"},{"end":"2027-01-20T05:45Z","end_local":"07:45","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-01-20T05:15Z","start_local":"07:15"}]},"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":"2027-01-19T16:57:29Z","dark_hours":11.14,"dark_to":"2027-01-20T04:05:49Z","moon":{"illumination":0.901,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":0.2,"moonrise":"2027-01-19T11:42:47Z","moonset":"2027-01-20T03:52:16Z","sunrise":"2027-01-20T05:43:16Z","sunset":"2027-01-19T15:19:50Z","twilight":{"astronomical":{"end":"2027-01-19T16:57:29Z","start":"2027-01-20T04:05:49Z"},"civil":{"end":"2027-01-19T15:50:15Z","start":"2027-01-20T05:12:56Z"},"nautical":{"end":"2027-01-19T16:24:20Z","start":"2027-01-20T04:38:55Z"}},"window_end":"2027-01-20T10:00:00Z","window_start":"2027-01-19T10:00:00Z"},"night_date":"2027-01-19","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."]}
