{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":4.5,"best_label":"good","best_window":"01:40\u201306:10","dark_hours":11.31,"date":"2043-01-11","moon_free_dark_hours":11.3,"moon_illumination":1,"moon_separation":113.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.58,"best_label":"good","best_window":"01:35\u201306:10","dark_hours":11.29,"date":"2043-01-12","moon_free_dark_hours":11.27,"moon_illumination":3,"moon_separation":127.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.67,"best_label":"good","best_window":"01:30\u201306:10","dark_hours":11.27,"date":"2043-01-13","moon_free_dark_hours":10.65,"moon_illumination":8,"moon_separation":140.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.67,"best_label":"good","best_window":"01:30\u201306:10","dark_hours":11.25,"date":"2043-01-14","moon_free_dark_hours":9.43,"moon_illumination":15,"moon_separation":154.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.75,"best_label":"good","best_window":"01:25\u201306:10","dark_hours":11.23,"date":"2043-01-15","moon_free_dark_hours":8.22,"moon_illumination":24,"moon_separation":167.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.83,"best_label":"good","best_window":"01:20\u201306:10","dark_hours":11.21,"date":"2043-01-16","moon_free_dark_hours":6.98,"moon_illumination":34,"moon_separation":175.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.92,"best_label":"good","best_window":"01:15\u201306:10","dark_hours":11.18,"date":"2043-01-17","moon_free_dark_hours":5.77,"moon_illumination":45,"moon_separation":163.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.92,"best_label":"good","best_window":"01:15\u201306:10","dark_hours":11.16,"date":"2043-01-18","moon_free_dark_hours":4.52,"moon_illumination":56,"moon_separation":149.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.92,"best_label":"good","best_window":"01:15\u201306:10","dark_hours":11.14,"date":"2043-01-19","moon_free_dark_hours":3.22,"moon_illumination":67,"moon_separation":135.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.92,"best_label":"good","best_window":"01:15\u201306:10","dark_hours":11.11,"date":"2043-01-20","moon_free_dark_hours":1.93,"moon_illumination":78,"moon_separation":120.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.75,"best_label":"good","best_window":"01:20\u201306:05","dark_hours":11.09,"date":"2043-01-21","moon_free_dark_hours":0.7,"moon_illumination":86,"moon_separation":106.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.08,"best_label":"good","best_window":"02:00\u201306:05","dark_hours":11.06,"date":"2043-01-22","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":92.8,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":50.1,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.25,"best_label":"good","best_window":"03:50\u201306:05","dark_hours":11.03,"date":"2043-01-23","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":78.9,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":50.1,"transit_local":"04:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.17,"best_label":"marginal","best_window":"00:55\u201306:05","dark_hours":11.0,"date":"2043-01-24","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":65.2,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":50.1,"transit_local":"04:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.92,"best_label":"marginal","best_window":"01:10\u201306:05","dark_hours":10.98,"date":"2043-01-25","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":51.8,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":50.1,"transit_local":"04:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.08,"best_label":"marginal","best_window":"03:00\u201306:05","dark_hours":10.95,"date":"2043-01-26","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":38.7,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"marginal","best_window":"03:35\u201306:05","dark_hours":10.92,"date":"2043-01-27","moon_free_dark_hours":0.87,"moon_illumination":92,"moon_separation":26.0,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":50.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.33,"best_label":"marginal","best_window":"00:45\u201306:05","dark_hours":10.89,"date":"2043-01-28","moon_free_dark_hours":1.93,"moon_illumination":86,"moon_separation":13.8,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":50.1,"transit_local":"04:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.67,"best_label":"marginal","best_window":"00:20\u201306:00","dark_hours":10.86,"date":"2043-01-29","moon_free_dark_hours":2.97,"moon_illumination":79,"moon_separation":4.4,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":50.1,"transit_local":"04:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.92,"best_label":"marginal","best_window":"00:05\u201306:00","dark_hours":10.83,"date":"2043-01-30","moon_free_dark_hours":3.98,"moon_illumination":70,"moon_separation":12.1,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":50.1,"transit_local":"04:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.08,"best_label":"marginal","best_window":"23:55\u201306:00","dark_hours":10.79,"date":"2043-01-31","moon_free_dark_hours":5.0,"moon_illumination":62,"moon_separation":23.6,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":50.1,"transit_local":"04:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.75,"best_label":"good","best_window":"00:15\u201306:00","dark_hours":10.76,"date":"2043-02-01","moon_free_dark_hours":6.03,"moon_illumination":52,"moon_separation":35.3,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":50.1,"transit_local":"04:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.75,"best_label":"good","best_window":"00:15\u201306:00","dark_hours":10.73,"date":"2043-02-02","moon_free_dark_hours":7.08,"moon_illumination":43,"moon_separation":47.0,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":50.1,"transit_local":"04:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.83,"best_label":"good","best_window":"00:10\u201306:00","dark_hours":10.69,"date":"2043-02-03","moon_free_dark_hours":8.15,"moon_illumination":34,"moon_separation":58.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.83,"best_label":"good","best_window":"00:05\u201305:55","dark_hours":10.66,"date":"2043-02-04","moon_free_dark_hours":9.18,"moon_illumination":25,"moon_separation":71.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.92,"best_label":"good","best_window":"00:00\u201305:55","dark_hours":10.63,"date":"2043-02-05","moon_free_dark_hours":10.15,"moon_illumination":17,"moon_separation":83.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.0,"best_label":"good","best_window":"23:55\u201305:55","dark_hours":10.59,"date":"2043-02-06","moon_free_dark_hours":10.57,"moon_illumination":10,"moon_separation":96.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.0,"best_label":"good","best_window":"23:55\u201305:55","dark_hours":10.55,"date":"2043-02-07","moon_free_dark_hours":10.53,"moon_illumination":5,"moon_separation":109.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.08,"best_label":"good","best_window":"23:50\u201305:55","dark_hours":10.52,"date":"2043-02-08","moon_free_dark_hours":10.5,"moon_illumination":1,"moon_separation":122.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.08,"best_label":"good","best_window":"23:45\u201305:50","dark_hours":10.48,"date":"2043-02-09","moon_free_dark_hours":10.47,"moon_illumination":0,"moon_separation":136.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Mon"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2043-01-11","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}}