{"assessment":{"best_window":{"end":"2027-01-22T20:15Z","end_local":"22:15","hours":3.17,"label":"marginal","mean_quality":0.39,"start":"2027-01-22T17:05Z","start_local":"19:05"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.66,"moon":7.87},"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 possible, with compromises \u2014 weather unknown","hourly":[{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T16:00Z","label":"poor","low":null,"mid":null,"moon_alt":5,"precip":null,"q":0.09,"rh":null,"sky":"nautical twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T17:00Z","label":"poor","low":null,"mid":null,"moon_alt":15,"precip":null,"q":0.25,"rh":null,"sky":"astronomical twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T18:00Z","label":"marginal","low":null,"mid":null,"moon_alt":26,"precip":null,"q":0.43,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T19:00Z","label":"marginal","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.36,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":47,"precip":null,"q":0.31,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T21:00Z","label":"poor","low":null,"mid":null,"moon_alt":57,"precip":null,"q":0.27,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T22:00Z","label":"poor","low":null,"mid":null,"moon_alt":64,"precip":null,"q":0.24,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-22T23:00Z","label":"poor","low":null,"mid":null,"moon_alt":67,"precip":null,"q":0.23,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-23T00:00Z","label":"poor","low":null,"mid":null,"moon_alt":64,"precip":null,"q":0.24,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-23T01:00Z","label":"poor","low":null,"mid":null,"moon_alt":56,"precip":null,"q":0.27,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-23T02:00Z","label":"marginal","low":null,"mid":null,"moon_alt":46,"precip":null,"q":0.32,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-23T03:00Z","label":"marginal","low":null,"mid":null,"moon_alt":35,"precip":null,"q":0.37,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-23T04:00Z","label":"marginal","low":null,"mid":null,"moon_alt":24,"precip":null,"q":0.44,"rh":null,"sky":"night","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-01-23T05:00Z","label":"poor","low":null,"mid":null,"moon_alt":13,"precip":null,"q":0.08,"rh":null,"sky":"nautical twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":0.49,"peak_sky":0.49,"quality_hours":3.88,"reasons":["moonlight cost 7.9 quality-hours","daylight and twilight cost 2.7 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":48,"score_weather":null,"sky_hours":3.88,"verdict":"unknown","verdict_astronomy":"marginal","weather_known":false,"windows":[{"end":"2027-01-22T15:55Z","end_local":"17:55","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-01-22T15:20Z","start_local":"17:20"},{"end":"2027-01-22T17:05Z","end_local":"19:05","hours":1.17,"label":"poor","mean_quality":0.17,"start":"2027-01-22T15:55Z","start_local":"17:55"},{"end":"2027-01-22T20:15Z","end_local":"22:15","hours":3.17,"label":"marginal","mean_quality":0.39,"start":"2027-01-22T17:05Z","start_local":"19:05"},{"end":"2027-01-23T01:45Z","end_local":"03:45","hours":5.5,"label":"poor","mean_quality":0.26,"start":"2027-01-22T20:15Z","start_local":"22:15"},{"end":"2027-01-23T04:05Z","end_local":"06:05","hours":2.33,"label":"marginal","mean_quality":0.37,"start":"2027-01-23T01:45Z","start_local":"03:45"},{"end":"2027-01-23T05:15Z","end_local":"07:15","hours":1.17,"label":"poor","mean_quality":0.15,"start":"2027-01-23T04:05Z","start_local":"06:05"},{"end":"2027-01-23T05:45Z","end_local":"07:45","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-01-23T05:15Z","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":"2027-01-22T17:00:37Z","dark_hours":11.06,"dark_to":"2027-01-23T04:04:21Z","moon":{"illumination":0.997,"phase":"full moon","waxing":false},"moon_free_dark_hours":0.0,"moonrise":"2027-01-22T15:30:02Z","moonset":"2027-01-23T06:14:54Z","sunrise":"2027-01-23T05:41:17Z","sunset":"2027-01-22T15:23:28Z","twilight":{"astronomical":{"end":"2027-01-22T17:00:37Z","start":"2027-01-23T04:04:21Z"},"civil":{"end":"2027-01-22T15:53:40Z","start":"2027-01-23T05:11:10Z"},"nautical":{"end":"2027-01-22T16:27:34Z","start":"2027-01-23T04:37:20Z"}},"window_end":"2027-01-23T10:00:00Z","window_start":"2027-01-22T10:00:00Z"},"night_date":"2027-01-22","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."]}
