{"assessment":{"best_window":{"end":"2027-02-16T03:45Z","end_local":"05:45","hours":5.0,"label":"good","mean_quality":0.81,"start":"2027-02-15T22:45Z","start_local":"00:45"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.55,"moon":3.72},"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":"2027-02-15T16:00Z","label":"unusable","low":null,"mid":null,"moon_alt":67,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T17:00Z","label":"poor","low":null,"mid":null,"moon_alt":74,"precip":null,"q":0.23,"rh":null,"sky":"astronomical twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T18:00Z","label":"marginal","low":null,"mid":null,"moon_alt":74,"precip":null,"q":0.47,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T19:00Z","label":"marginal","low":null,"mid":null,"moon_alt":67,"precip":null,"q":0.48,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":57,"precip":null,"q":0.5,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":46,"precip":null,"q":0.53,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.57,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-15T23:00Z","label":"good","low":null,"mid":null,"moon_alt":25,"precip":null,"q":0.61,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-16T00:00Z","label":"good","low":null,"mid":null,"moon_alt":15,"precip":null,"q":0.66,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-16T01:00Z","label":"good","low":null,"mid":null,"moon_alt":5,"precip":null,"q":0.7,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-16T02:00Z","label":"good","low":null,"mid":null,"moon_alt":-3,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-16T03:00Z","label":"good","low":null,"mid":null,"moon_alt":-11,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-16T04:00Z","label":"marginal","low":null,"mid":null,"moon_alt":-16,"precip":null,"q":0.5,"rh":null,"sky":"astronomical twilight","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-02-16T05:00Z","label":"unusable","low":null,"mid":null,"moon_alt":-20,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":7.23,"reasons":["moonlight cost 3.7 quality-hours","daylight and twilight cost 2.5 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":7.23,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-02-15T16:25Z","end_local":"18:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-02-15T15:50Z","start_local":"17:50"},{"end":"2027-02-15T17:30Z","end_local":"19:30","hours":1.08,"label":"poor","mean_quality":0.16,"start":"2027-02-15T16:25Z","start_local":"18:25"},{"end":"2027-02-15T22:45Z","end_local":"00:45","hours":5.25,"label":"marginal","mean_quality":0.51,"start":"2027-02-15T17:30Z","start_local":"19:30"},{"end":"2027-02-16T03:45Z","end_local":"05:45","hours":5.0,"label":"good","mean_quality":0.81,"start":"2027-02-15T22:45Z","start_local":"00:45"},{"end":"2027-02-16T04:15Z","end_local":"06:15","hours":0.5,"label":"marginal","mean_quality":0.5,"start":"2027-02-16T03:45Z","start_local":"05:45"},{"end":"2027-02-16T04:50Z","end_local":"06:50","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-02-16T04:15Z","start_local":"06:15"},{"end":"2027-02-16T05:20Z","end_local":"07:20","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-02-16T04:50Z","start_local":"06:50"}]},"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":"2027-02-15T17:27:12Z","dark_hours":10.26,"dark_to":"2027-02-16T03:42:32Z","moon":{"illumination":0.678,"phase":"waxing gibbous","waxing":true},"moon_free_dark_hours":2.1,"moonrise":null,"moonset":"2027-02-16T01:35:24Z","sunrise":"2027-02-16T05:15:41Z","sunset":"2027-02-15T15:53:51Z","twilight":{"astronomical":{"end":"2027-02-15T17:27:12Z","start":"2027-02-16T03:42:32Z"},"civil":{"end":"2027-02-15T16:22:24Z","start":"2027-02-16T04:47:13Z"},"nautical":{"end":"2027-02-15T16:54:58Z","start":"2027-02-16T04:14:43Z"}},"window_end":"2027-02-16T10:00:00Z","window_start":"2027-02-15T10:00:00Z"},"night_date":"2027-02-15","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."]}
