{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.5,"best_label":"good","best_window":"05:10\u201305:40","dark_hours":11.06,"date":"2028-11-18","moon_free_dark_hours":11.05,"moon_illumination":7,"moon_separation":82.2,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.2,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.58,"best_label":"good","best_window":"05:05\u201305:40","dark_hours":11.08,"date":"2028-11-19","moon_free_dark_hours":10.25,"moon_illumination":14,"moon_separation":95.5,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.2,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.75,"best_label":"good","best_window":"05:00\u201305:45","dark_hours":11.11,"date":"2028-11-20","moon_free_dark_hours":9.17,"moon_illumination":21,"moon_separation":108.3,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":50.2,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"05:00\u201305:45","dark_hours":11.13,"date":"2028-11-21","moon_free_dark_hours":8.08,"moon_illumination":30,"moon_separation":120.7,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":50.2,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.83,"best_label":"good","best_window":"04:55\u201305:45","dark_hours":11.16,"date":"2028-11-22","moon_free_dark_hours":7.03,"moon_illumination":40,"moon_separation":132.7,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.2,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.92,"best_label":"good","best_window":"04:50\u201305:45","dark_hours":11.18,"date":"2028-11-23","moon_free_dark_hours":6.03,"moon_illumination":49,"moon_separation":144.3,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":50.2,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.0,"best_label":"good","best_window":"04:45\u201305:45","dark_hours":11.2,"date":"2028-11-24","moon_free_dark_hours":5.05,"moon_illumination":59,"moon_separation":155.5,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":50.2,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.17,"best_label":"good","best_window":"04:40\u201305:50","dark_hours":11.22,"date":"2028-11-25","moon_free_dark_hours":4.08,"moon_illumination":68,"moon_separation":165.4,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":50.2,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.17,"best_label":"good","best_window":"04:40\u201305:50","dark_hours":11.25,"date":"2028-11-26","moon_free_dark_hours":3.1,"moon_illumination":76,"moon_separation":170.1,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":50.2,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.25,"best_label":"good","best_window":"04:35\u201305:50","dark_hours":11.27,"date":"2028-11-27","moon_free_dark_hours":2.12,"moon_illumination":84,"moon_separation":163.7,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":50.2,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.25,"best_label":"good","best_window":"04:35\u201305:50","dark_hours":11.29,"date":"2028-11-28","moon_free_dark_hours":1.1,"moon_illumination":90,"moon_separation":153.2,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":50.2,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.25,"best_label":"good","best_window":"04:35\u201305:50","dark_hours":11.3,"date":"2028-11-29","moon_free_dark_hours":0.03,"moon_illumination":95,"moon_separation":141.5,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":50.2,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.25,"best_label":"good","best_window":"04:35\u201305:50","dark_hours":11.32,"date":"2028-11-30","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":129.4,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":50.2,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.33,"best_label":"good","best_window":"04:35\u201305:55","dark_hours":11.34,"date":"2028-12-01","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":116.9,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":50.2,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.25,"best_label":"good","best_window":"04:40\u201305:55","dark_hours":11.36,"date":"2028-12-02","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":104.1,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":50.2,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.42,"best_label":"good","best_window":"05:30\u201305:55","dark_hours":11.37,"date":"2028-12-03","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":91.1,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":50.2,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.08,"best_label":"marginal","best_window":"03:50\u201305:55","dark_hours":11.39,"date":"2028-12-04","moon_free_dark_hours":0.67,"moon_illumination":91,"moon_separation":77.9,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.2,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.0,"best_label":"marginal","best_window":"03:55\u201305:55","dark_hours":11.4,"date":"2028-12-05","moon_free_dark_hours":1.83,"moon_illumination":84,"moon_separation":64.5,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":50.2,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"marginal","best_window":"03:50\u201305:55","dark_hours":11.41,"date":"2028-12-06","moon_free_dark_hours":3.02,"moon_illumination":75,"moon_separation":51.0,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":50.2,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.25,"best_label":"marginal","best_window":"03:45\u201306:00","dark_hours":11.43,"date":"2028-12-07","moon_free_dark_hours":4.22,"moon_illumination":65,"moon_separation":37.5,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":50.2,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.5,"best_label":"marginal","best_window":"03:30\u201306:00","dark_hours":11.44,"date":"2028-12-08","moon_free_dark_hours":5.42,"moon_illumination":54,"moon_separation":24.4,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":50.2,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.67,"best_label":"good","best_window":"04:20\u201306:00","dark_hours":11.45,"date":"2028-12-09","moon_free_dark_hours":6.62,"moon_illumination":42,"moon_separation":12.9,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":50.2,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.0,"best_label":"good","best_window":"04:00\u201306:00","dark_hours":11.46,"date":"2028-12-10","moon_free_dark_hours":7.83,"moon_illumination":31,"moon_separation":11.6,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":50.2,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.25,"best_label":"good","best_window":"03:45\u201306:00","dark_hours":11.47,"date":"2028-12-11","moon_free_dark_hours":9.07,"moon_illumination":21,"moon_separation":22.4,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":50.2,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.42,"best_label":"good","best_window":"03:35\u201306:00","dark_hours":11.48,"date":"2028-12-12","moon_free_dark_hours":10.33,"moon_illumination":12,"moon_separation":35.7,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":50.2,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.58,"best_label":"good","best_window":"03:30\u201306:05","dark_hours":11.48,"date":"2028-12-13","moon_free_dark_hours":11.47,"moon_illumination":6,"moon_separation":49.4,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":50.2,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"03:25\u201306:05","dark_hours":11.49,"date":"2028-12-14","moon_free_dark_hours":11.47,"moon_illumination":2,"moon_separation":63.2,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":50.2,"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":"2028-12-15","moon_free_dark_hours":11.48,"moon_illumination":0,"moon_separation":76.8,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":50.2,"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":"2028-12-16","moon_free_dark_hours":11.48,"moon_illumination":1,"moon_separation":90.2,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":50.2,"transit_local":"07:05","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":"2028-12-17","moon_free_dark_hours":11.48,"moon_illumination":4,"moon_separation":103.2,"score":null,"score_astronomy":68,"score_weather":null,"transit_alt":50.2,"transit_local":"07:00","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":"2028-11-18","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}}