{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.33,"best_label":"good","best_window":"05:35\u201305:55","dark_hours":11.33,"date":"2026-12-01","moon_free_dark_hours":6.27,"moon_illumination":43,"moon_separation":19.1,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.2,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.33,"best_label":"good","best_window":"04:35\u201305:55","dark_hours":11.35,"date":"2026-12-02","moon_free_dark_hours":7.4,"moon_illumination":33,"moon_separation":9.2,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":50.2,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.5,"best_label":"good","best_window":"04:25\u201305:55","dark_hours":11.36,"date":"2026-12-03","moon_free_dark_hours":8.5,"moon_illumination":23,"moon_separation":11.9,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":50.2,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.67,"best_label":"good","best_window":"04:15\u201305:55","dark_hours":11.38,"date":"2026-12-04","moon_free_dark_hours":9.6,"moon_illumination":16,"moon_separation":22.7,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":50.2,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.83,"best_label":"good","best_window":"04:05\u201305:55","dark_hours":11.39,"date":"2026-12-05","moon_free_dark_hours":10.72,"moon_illumination":9,"moon_separation":34.6,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":50.2,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.92,"best_label":"good","best_window":"04:00\u201305:55","dark_hours":11.41,"date":"2026-12-06","moon_free_dark_hours":11.38,"moon_illumination":4,"moon_separation":46.5,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":50.2,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.08,"best_label":"good","best_window":"03:55\u201306:00","dark_hours":11.42,"date":"2026-12-07","moon_free_dark_hours":11.4,"moon_illumination":1,"moon_separation":58.5,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":50.2,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.08,"best_label":"good","best_window":"03:55\u201306:00","dark_hours":11.43,"date":"2026-12-08","moon_free_dark_hours":11.42,"moon_illumination":0,"moon_separation":70.3,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":50.2,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.17,"best_label":"good","best_window":"03:50\u201306:00","dark_hours":11.44,"date":"2026-12-09","moon_free_dark_hours":11.42,"moon_illumination":1,"moon_separation":82.1,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":50.2,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.25,"best_label":"good","best_window":"03:45\u201306:00","dark_hours":11.45,"date":"2026-12-10","moon_free_dark_hours":11.43,"moon_illumination":3,"moon_separation":93.8,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":50.2,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.33,"best_label":"good","best_window":"03:40\u201306:00","dark_hours":11.46,"date":"2026-12-11","moon_free_dark_hours":11.37,"moon_illumination":7,"moon_separation":105.5,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":50.2,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.42,"best_label":"good","best_window":"03:35\u201306:00","dark_hours":11.47,"date":"2026-12-12","moon_free_dark_hours":10.33,"moon_illumination":13,"moon_separation":117.2,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":50.2,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"03:35\u201306:00","dark_hours":11.48,"date":"2026-12-13","moon_free_dark_hours":9.27,"moon_illumination":20,"moon_separation":128.9,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":50.2,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.58,"best_label":"good","best_window":"03:30\u201306:05","dark_hours":11.49,"date":"2026-12-14","moon_free_dark_hours":8.23,"moon_illumination":28,"moon_separation":140.6,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":50.2,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.67,"best_label":"good","best_window":"03:25\u201306:05","dark_hours":11.49,"date":"2026-12-15","moon_free_dark_hours":7.2,"moon_illumination":37,"moon_separation":152.4,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":50.2,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.75,"best_label":"good","best_window":"03:20\u201306:05","dark_hours":11.5,"date":"2026-12-16","moon_free_dark_hours":6.13,"moon_illumination":47,"moon_separation":163.8,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":50.2,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.5,"date":"2026-12-17","moon_free_dark_hours":5.07,"moon_illumination":57,"moon_separation":171.6,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":50.2,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.5,"date":"2026-12-18","moon_free_dark_hours":3.92,"moon_illumination":67,"moon_separation":165.5,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.2,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.51,"date":"2026-12-19","moon_free_dark_hours":2.73,"moon_illumination":77,"moon_separation":153.1,"score":null,"score_astronomy":70,"score_weather":null,"transit_alt":50.2,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.83,"best_label":"good","best_window":"03:15\u201306:05","dark_hours":11.51,"date":"2026-12-20","moon_free_dark_hours":1.47,"moon_illumination":86,"moon_separation":139.5,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.2,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.92,"best_label":"good","best_window":"03:10\u201306:05","dark_hours":11.51,"date":"2026-12-21","moon_free_dark_hours":0.17,"moon_illumination":93,"moon_separation":125.1,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":50.2,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.92,"best_label":"good","best_window":"03:15\u201306:10","dark_hours":11.51,"date":"2026-12-22","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":110.4,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":50.2,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.17,"best_label":"good","best_window":"04:00\u201306:10","dark_hours":11.51,"date":"2026-12-23","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":95.3,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":50.2,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.5,"best_label":"good","best_window":"05:40\u201306:10","dark_hours":11.5,"date":"2026-12-24","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":80.1,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":50.2,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.42,"best_label":"marginal","best_window":"02:45\u201306:10","dark_hours":11.5,"date":"2026-12-25","moon_free_dark_hours":0.07,"moon_illumination":95,"moon_separation":65.1,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":50.2,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.33,"best_label":"marginal","best_window":"02:50\u201306:10","dark_hours":11.5,"date":"2026-12-26","moon_free_dark_hours":1.42,"moon_illumination":88,"moon_separation":50.4,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.2,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.42,"best_label":"marginal","best_window":"02:45\u201306:10","dark_hours":11.49,"date":"2026-12-27","moon_free_dark_hours":2.72,"moon_illumination":79,"moon_separation":36.2,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.2,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.75,"best_label":"marginal","best_window":"02:25\u201306:10","dark_hours":11.49,"date":"2026-12-28","moon_free_dark_hours":3.92,"moon_illumination":70,"moon_separation":22.7,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":50.2,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.0,"best_label":"marginal","best_window":"02:10\u201306:10","dark_hours":11.48,"date":"2026-12-29","moon_free_dark_hours":5.1,"moon_illumination":59,"moon_separation":11.3,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":50.2,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.92,"best_label":"good","best_window":"03:15\u201306:10","dark_hours":11.47,"date":"2026-12-30","moon_free_dark_hours":6.22,"moon_illumination":48,"moon_separation":10.1,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":50.2,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Wed"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2026-12-01","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}}