{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.58,"best_label":"good","best_window":"03:30\u201306:05","dark_hours":11.49,"date":"2045-12-14","moon_free_dark_hours":7.4,"moon_illumination":35,"moon_separation":149.2,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":50.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.67,"best_label":"good","best_window":"03:25\u201306:05","dark_hours":11.49,"date":"2045-12-15","moon_free_dark_hours":6.42,"moon_illumination":44,"moon_separation":160.2,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":50.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.75,"best_label":"good","best_window":"03:20\u201306:05","dark_hours":11.5,"date":"2045-12-16","moon_free_dark_hours":5.42,"moon_illumination":54,"moon_separation":169.5,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":50.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.5,"date":"2045-12-17","moon_free_dark_hours":4.4,"moon_illumination":63,"moon_separation":169.3,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":50.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.5,"date":"2045-12-18","moon_free_dark_hours":3.35,"moon_illumination":72,"moon_separation":159.6,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.1,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.51,"date":"2045-12-19","moon_free_dark_hours":2.25,"moon_illumination":81,"moon_separation":147.8,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.1,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.51,"date":"2045-12-20","moon_free_dark_hours":1.1,"moon_illumination":88,"moon_separation":135.2,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"03:10\u201306:05","dark_hours":11.51,"date":"2045-12-21","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":122.0,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":50.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"03:20\u201306:10","dark_hours":11.51,"date":"2045-12-22","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":108.4,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":50.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.08,"best_label":"good","best_window":"04:05\u201306:10","dark_hours":11.5,"date":"2045-12-23","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":94.4,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":50.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.58,"best_label":"good","best_window":"05:35\u201306:10","dark_hours":11.5,"date":"2045-12-24","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":80.2,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":50.1,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.42,"best_label":"marginal","best_window":"02:45\u201306:10","dark_hours":11.5,"date":"2045-12-25","moon_free_dark_hours":0.03,"moon_illumination":95,"moon_separation":65.8,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":50.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.33,"best_label":"marginal","best_window":"02:50\u201306:10","dark_hours":11.49,"date":"2045-12-26","moon_free_dark_hours":1.32,"moon_illumination":89,"moon_separation":51.4,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.42,"best_label":"marginal","best_window":"02:45\u201306:10","dark_hours":11.49,"date":"2045-12-27","moon_free_dark_hours":2.62,"moon_illumination":80,"moon_separation":37.1,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.1,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.75,"best_label":"marginal","best_window":"02:25\u201306:10","dark_hours":11.48,"date":"2045-12-28","moon_free_dark_hours":3.87,"moon_illumination":70,"moon_separation":23.4,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":50.1,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.0,"best_label":"marginal","best_window":"02:10\u201306:10","dark_hours":11.48,"date":"2045-12-29","moon_free_dark_hours":5.07,"moon_illumination":59,"moon_separation":11.6,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":50.1,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.08,"best_label":"good","best_window":"03:05\u201306:10","dark_hours":11.47,"date":"2045-12-30","moon_free_dark_hours":6.28,"moon_illumination":48,"moon_separation":11.0,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":50.1,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.5,"best_label":"good","best_window":"02:40\u201306:10","dark_hours":11.46,"date":"2045-12-31","moon_free_dark_hours":7.48,"moon_illumination":37,"moon_separation":22.0,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":50.1,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.83,"best_label":"good","best_window":"02:20\u201306:10","dark_hours":11.45,"date":"2046-01-01","moon_free_dark_hours":8.68,"moon_illumination":27,"moon_separation":34.8,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":50.1,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.92,"best_label":"good","best_window":"02:15\u201306:10","dark_hours":11.44,"date":"2046-01-02","moon_free_dark_hours":9.85,"moon_illumination":18,"moon_separation":47.7,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":50.1,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.0,"best_label":"good","best_window":"02:10\u201306:10","dark_hours":11.43,"date":"2046-01-03","moon_free_dark_hours":10.97,"moon_illumination":11,"moon_separation":60.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.08,"best_label":"good","best_window":"02:05\u201306:10","dark_hours":11.41,"date":"2046-01-04","moon_free_dark_hours":11.4,"moon_illumination":5,"moon_separation":73.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.17,"best_label":"good","best_window":"02:00\u201306:10","dark_hours":11.4,"date":"2046-01-05","moon_free_dark_hours":11.38,"moon_illumination":2,"moon_separation":85.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.17,"best_label":"good","best_window":"02:00\u201306:10","dark_hours":11.39,"date":"2046-01-06","moon_free_dark_hours":11.37,"moon_illumination":0,"moon_separation":98.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.25,"best_label":"good","best_window":"01:55\u201306:10","dark_hours":11.37,"date":"2046-01-07","moon_free_dark_hours":11.35,"moon_illumination":1,"moon_separation":110.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.33,"best_label":"good","best_window":"01:50\u201306:10","dark_hours":11.36,"date":"2046-01-08","moon_free_dark_hours":11.33,"moon_illumination":3,"moon_separation":122.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.42,"best_label":"good","best_window":"01:45\u201306:10","dark_hours":11.34,"date":"2046-01-09","moon_free_dark_hours":10.77,"moon_illumination":7,"moon_separation":134.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.42,"best_label":"good","best_window":"01:45\u201306:10","dark_hours":11.32,"date":"2046-01-10","moon_free_dark_hours":9.73,"moon_illumination":12,"moon_separation":145.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.5,"best_label":"good","best_window":"01:40\u201306:10","dark_hours":11.3,"date":"2046-01-11","moon_free_dark_hours":8.72,"moon_illumination":19,"moon_separation":156.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.58,"best_label":"good","best_window":"01:35\u201306:10","dark_hours":11.28,"date":"2046-01-12","moon_free_dark_hours":7.7,"moon_illumination":27,"moon_separation":166.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Fri"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2045-12-14","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}}