{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":5.08,"best_label":"good","best_window":"01:00\u201306:05","dark_hours":11.09,"date":"2039-01-21","moon_free_dark_hours":10.88,"moon_illumination":9,"moon_separation":81.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.17,"best_label":"good","best_window":"00:55\u201306:05","dark_hours":11.06,"date":"2039-01-22","moon_free_dark_hours":11.05,"moon_illumination":4,"moon_separation":95.5,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.25,"best_label":"good","best_window":"00:50\u201306:05","dark_hours":11.03,"date":"2039-01-23","moon_free_dark_hours":11.02,"moon_illumination":1,"moon_separation":109.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.25,"best_label":"good","best_window":"00:50\u201306:05","dark_hours":11.01,"date":"2039-01-24","moon_free_dark_hours":11.0,"moon_illumination":0,"moon_separation":123.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.33,"best_label":"good","best_window":"00:45\u201306:05","dark_hours":10.98,"date":"2039-01-25","moon_free_dark_hours":10.97,"moon_illumination":2,"moon_separation":137.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.42,"best_label":"good","best_window":"00:40\u201306:05","dark_hours":10.95,"date":"2039-01-26","moon_free_dark_hours":10.52,"moon_illumination":7,"moon_separation":151.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.5,"best_label":"good","best_window":"00:35\u201306:05","dark_hours":10.92,"date":"2039-01-27","moon_free_dark_hours":9.4,"moon_illumination":13,"moon_separation":164.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.5,"best_label":"good","best_window":"00:35\u201306:05","dark_hours":10.89,"date":"2039-01-28","moon_free_dark_hours":8.32,"moon_illumination":20,"moon_separation":176.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.5,"best_label":"good","best_window":"00:30\u201306:00","dark_hours":10.86,"date":"2039-01-29","moon_free_dark_hours":7.27,"moon_illumination":29,"moon_separation":170.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.58,"best_label":"good","best_window":"00:25\u201306:00","dark_hours":10.83,"date":"2039-01-30","moon_free_dark_hours":6.25,"moon_illumination":38,"moon_separation":158.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.58,"best_label":"good","best_window":"00:25\u201306:00","dark_hours":10.79,"date":"2039-01-31","moon_free_dark_hours":5.25,"moon_illumination":48,"moon_separation":146.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.67,"best_label":"good","best_window":"00:20\u201306:00","dark_hours":10.76,"date":"2039-02-01","moon_free_dark_hours":4.25,"moon_illumination":57,"moon_separation":135.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.67,"best_label":"good","best_window":"00:20\u201306:00","dark_hours":10.73,"date":"2039-02-02","moon_free_dark_hours":3.23,"moon_illumination":66,"moon_separation":123.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"04:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.67,"best_label":"good","best_window":"00:20\u201306:00","dark_hours":10.7,"date":"2039-02-03","moon_free_dark_hours":2.23,"moon_illumination":75,"moon_separation":111.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.42,"best_label":"good","best_window":"00:30\u201305:55","dark_hours":10.66,"date":"2039-02-04","moon_free_dark_hours":1.25,"moon_illumination":83,"moon_separation":99.2,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":50.1,"transit_local":"03:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.5,"best_label":"good","best_window":"01:25\u201305:55","dark_hours":10.63,"date":"2039-02-05","moon_free_dark_hours":0.32,"moon_illumination":89,"moon_separation":86.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":50.1,"transit_local":"03:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.67,"best_label":"good","best_window":"03:15\u201305:55","dark_hours":10.59,"date":"2039-02-06","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":74.3,"score":null,"score_astronomy":61,"score_weather":null,"transit_alt":50.1,"transit_local":"03:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.92,"best_label":"marginal","best_window":"00:00\u201305:55","dark_hours":10.56,"date":"2039-02-07","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":61.5,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":50.1,"transit_local":"03:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.0,"best_label":"marginal","best_window":"00:55\u201305:55","dark_hours":10.52,"date":"2039-02-08","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":48.3,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":50.1,"transit_local":"03:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.42,"best_label":"marginal","best_window":"03:25\u201305:50","dark_hours":10.48,"date":"2039-02-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":34.9,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":50.1,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.75,"best_label":"marginal","best_window":"04:05\u201305:50","dark_hours":10.45,"date":"2039-02-10","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":21.2,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":50.1,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.0,"best_label":"marginal","best_window":"23:50\u201305:50","dark_hours":10.41,"date":"2039-02-11","moon_free_dark_hours":1.13,"moon_illumination":91,"moon_separation":7.4,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.1,"transit_local":"03:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.42,"best_label":"marginal","best_window":"23:25\u201305:50","dark_hours":10.37,"date":"2039-02-12","moon_free_dark_hours":2.3,"moon_illumination":83,"moon_separation":6.6,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":50.1,"transit_local":"03:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.67,"best_label":"marginal","best_window":"23:05\u201305:45","dark_hours":10.33,"date":"2039-02-13","moon_free_dark_hours":3.47,"moon_illumination":74,"moon_separation":20.7,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":50.1,"transit_local":"03:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.0,"best_label":"good","best_window":"23:25\u201303:25","dark_hours":10.29,"date":"2039-02-14","moon_free_dark_hours":4.63,"moon_illumination":63,"moon_separation":34.8,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":50.1,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.42,"best_label":"good","best_window":"23:20\u201305:45","dark_hours":10.25,"date":"2039-02-15","moon_free_dark_hours":5.85,"moon_illumination":52,"moon_separation":48.9,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":50.1,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.42,"best_label":"good","best_window":"23:20\u201305:45","dark_hours":10.21,"date":"2039-02-16","moon_free_dark_hours":7.03,"moon_illumination":41,"moon_separation":63.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.42,"best_label":"good","best_window":"23:15\u201305:40","dark_hours":10.17,"date":"2039-02-17","moon_free_dark_hours":8.2,"moon_illumination":30,"moon_separation":77.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"03:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.5,"best_label":"good","best_window":"23:10\u201305:40","dark_hours":10.13,"date":"2039-02-18","moon_free_dark_hours":9.25,"moon_illumination":20,"moon_separation":91.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.58,"best_label":"good","best_window":"23:05\u201305:40","dark_hours":10.09,"date":"2039-02-19","moon_free_dark_hours":10.08,"moon_illumination":12,"moon_separation":105.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Sat"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2039-01-21","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}}