{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.72,"date":"2031-10-13","moon_free_dark_hours":9.25,"moon_illumination":6,"moon_separation":17.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.77,"date":"2031-10-14","moon_free_dark_hours":9.75,"moon_illumination":2,"moon_separation":8.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.81,"date":"2031-10-15","moon_free_dark_hours":9.8,"moon_illumination":0,"moon_separation":13.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.86,"date":"2031-10-16","moon_free_dark_hours":9.83,"moon_illumination":0,"moon_separation":25.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.9,"date":"2031-10-17","moon_free_dark_hours":9.88,"moon_illumination":3,"moon_separation":38.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.94,"date":"2031-10-18","moon_free_dark_hours":9.92,"moon_illumination":8,"moon_separation":52.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.98,"date":"2031-10-19","moon_free_dark_hours":9.45,"moon_illumination":15,"moon_separation":65.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.02,"date":"2031-10-20","moon_free_dark_hours":8.52,"moon_illumination":24,"moon_separation":79.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.07,"date":"2031-10-21","moon_free_dark_hours":7.48,"moon_illumination":34,"moon_separation":93.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.11,"date":"2031-10-22","moon_free_dark_hours":6.37,"moon_illumination":46,"moon_separation":107.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.15,"date":"2031-10-23","moon_free_dark_hours":5.23,"moon_illumination":57,"moon_separation":121.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.19,"date":"2031-10-24","moon_free_dark_hours":4.08,"moon_illumination":68,"moon_separation":135.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.23,"date":"2031-10-25","moon_free_dark_hours":2.95,"moon_illumination":78,"moon_separation":149.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.27,"date":"2031-10-26","moon_free_dark_hours":1.82,"moon_illumination":87,"moon_separation":162.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.31,"date":"2031-10-27","moon_free_dark_hours":0.7,"moon_illumination":93,"moon_separation":171.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.34,"date":"2031-10-28","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":165.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.38,"date":"2031-10-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":153.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.42,"date":"2031-10-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":141.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.46,"date":"2031-10-31","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":128.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.49,"date":"2031-11-01","moon_free_dark_hours":0.02,"moon_illumination":93,"moon_separation":115.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.53,"date":"2031-11-02","moon_free_dark_hours":0.87,"moon_illumination":87,"moon_separation":103.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.57,"date":"2031-11-03","moon_free_dark_hours":1.75,"moon_illumination":80,"moon_separation":91.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.6,"date":"2031-11-04","moon_free_dark_hours":2.67,"moon_illumination":72,"moon_separation":79.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.64,"date":"2031-11-05","moon_free_dark_hours":3.62,"moon_illumination":63,"moon_separation":68.1,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.67,"date":"2031-11-06","moon_free_dark_hours":4.58,"moon_illumination":54,"moon_separation":56.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.7,"date":"2031-11-07","moon_free_dark_hours":5.55,"moon_illumination":44,"moon_separation":44.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"marginal","best_window":"05:25\u201305:30","dark_hours":10.74,"date":"2031-11-08","moon_free_dark_hours":6.55,"moon_illumination":35,"moon_separation":33.1,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"marginal","best_window":"05:20\u201305:30","dark_hours":10.77,"date":"2031-11-09","moon_free_dark_hours":7.55,"moon_illumination":26,"moon_separation":21.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.25,"best_label":"marginal","best_window":"05:15\u201305:30","dark_hours":10.8,"date":"2031-11-10","moon_free_dark_hours":8.58,"moon_illumination":17,"moon_separation":11.1,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":50.2,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"marginal","best_window":"05:10\u201305:35","dark_hours":10.83,"date":"2031-11-11","moon_free_dark_hours":9.67,"moon_illumination":10,"moon_separation":10.1,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":50.2,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2031-10-13","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}}