{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.35,"date":"2028-07-22","moon_free_dark_hours":5.33,"moon_illumination":1,"moon_separation":54.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.4,"date":"2028-07-23","moon_free_dark_hours":5.38,"moon_illumination":5,"moon_separation":40.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.45,"date":"2028-07-24","moon_free_dark_hours":5.43,"moon_illumination":11,"moon_separation":25.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.5,"date":"2028-07-25","moon_free_dark_hours":5.48,"moon_illumination":20,"moon_separation":13.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.55,"date":"2028-07-26","moon_free_dark_hours":5.38,"moon_illumination":30,"moon_separation":11.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.6,"date":"2028-07-27","moon_free_dark_hours":4.93,"moon_illumination":41,"moon_separation":21.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.66,"date":"2028-07-28","moon_free_dark_hours":4.43,"moon_illumination":52,"moon_separation":34.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.71,"date":"2028-07-29","moon_free_dark_hours":3.85,"moon_illumination":63,"moon_separation":47.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.77,"date":"2028-07-30","moon_free_dark_hours":3.13,"moon_illumination":73,"moon_separation":60.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.82,"date":"2028-07-31","moon_free_dark_hours":2.32,"moon_illumination":82,"moon_separation":73.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.88,"date":"2028-08-01","moon_free_dark_hours":1.37,"moon_illumination":89,"moon_separation":85.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.93,"date":"2028-08-02","moon_free_dark_hours":0.37,"moon_illumination":94,"moon_separation":98.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.99,"date":"2028-08-03","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":110.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.04,"date":"2028-08-04","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":122.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.1,"date":"2028-08-05","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":134.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.16,"date":"2028-08-06","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":145.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.21,"date":"2028-08-07","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":156.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.27,"date":"2028-08-08","moon_free_dark_hours":0.0,"moon_illumination":88,"moon_separation":166.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.33,"date":"2028-08-09","moon_free_dark_hours":0.0,"moon_illumination":82,"moon_separation":169.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.38,"date":"2028-08-10","moon_free_dark_hours":0.15,"moon_illumination":74,"moon_separation":162.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.44,"date":"2028-08-11","moon_free_dark_hours":0.58,"moon_illumination":65,"moon_separation":152.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.5,"date":"2028-08-12","moon_free_dark_hours":1.12,"moon_illumination":56,"moon_separation":140.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.56,"date":"2028-08-13","moon_free_dark_hours":1.75,"moon_illumination":46,"moon_separation":128.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.61,"date":"2028-08-14","moon_free_dark_hours":2.53,"moon_illumination":35,"moon_separation":115.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.67,"date":"2028-08-15","moon_free_dark_hours":3.48,"moon_illumination":26,"moon_separation":102.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.73,"date":"2028-08-16","moon_free_dark_hours":4.6,"moon_illumination":16,"moon_separation":89.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.79,"date":"2028-08-17","moon_free_dark_hours":5.83,"moon_illumination":9,"moon_separation":75.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.84,"date":"2028-08-18","moon_free_dark_hours":6.83,"moon_illumination":3,"moon_separation":60.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.9,"date":"2028-08-19","moon_free_dark_hours":6.88,"moon_illumination":0,"moon_separation":46.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.96,"date":"2028-08-20","moon_free_dark_hours":6.95,"moon_illumination":0,"moon_separation":31.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"15:55","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2028-07-22","target":{"dec":2.05238823,"morphology":"E3","name":"3C 273","ra":187.27791594,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=3C%20273","source":"sesame","type":"BLL","type_text":"BL Lac object \u2014 a blazar","vmag":14.83}}