{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":6.25,"best_label":"marginal","best_window":"23:30\u201305:45","dark_hours":10.31,"date":"2041-02-13","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":63.5,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":50.1,"transit_local":"03:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.92,"best_label":"marginal","best_window":"23:50\u201305:45","dark_hours":10.27,"date":"2041-02-14","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":51.7,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":50.1,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.58,"best_label":"marginal","best_window":"02:10\u201305:45","dark_hours":10.23,"date":"2041-02-15","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":39.8,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.1,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.75,"best_label":"marginal","best_window":"04:00\u201305:45","dark_hours":10.19,"date":"2041-02-16","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":28.0,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":50.1,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.92,"best_label":"marginal","best_window":"03:45\u201305:40","dark_hours":10.15,"date":"2041-02-17","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":16.0,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.1,"transit_local":"03:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.33,"best_label":"marginal","best_window":"23:20\u201305:40","dark_hours":10.11,"date":"2041-02-18","moon_free_dark_hours":0.83,"moon_illumination":93,"moon_separation":4.2,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":50.1,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.75,"best_label":"marginal","best_window":"22:55\u201305:40","dark_hours":10.07,"date":"2041-02-19","moon_free_dark_hours":1.85,"moon_illumination":87,"moon_separation":8.3,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":50.1,"transit_local":"02:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.0,"best_label":"marginal","best_window":"22:40\u201305:40","dark_hours":10.03,"date":"2041-02-20","moon_free_dark_hours":2.88,"moon_illumination":80,"moon_separation":20.6,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":50.1,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.67,"best_label":"good","best_window":"22:55\u201323:35","dark_hours":9.98,"date":"2041-02-21","moon_free_dark_hours":3.95,"moon_illumination":71,"moon_separation":33.1,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":50.1,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.08,"best_label":"good","best_window":"22:50\u201304:55","dark_hours":9.94,"date":"2041-02-22","moon_free_dark_hours":5.07,"moon_illumination":61,"moon_separation":45.9,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":50.1,"transit_local":"02:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.75,"best_label":"good","best_window":"22:50\u201305:35","dark_hours":9.9,"date":"2041-02-23","moon_free_dark_hours":6.2,"moon_illumination":51,"moon_separation":59.1,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":50.1,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.75,"best_label":"good","best_window":"22:45\u201305:30","dark_hours":9.85,"date":"2041-02-24","moon_free_dark_hours":7.38,"moon_illumination":40,"moon_separation":72.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.83,"best_label":"good","best_window":"22:40\u201305:30","dark_hours":9.81,"date":"2041-02-25","moon_free_dark_hours":8.5,"moon_illumination":29,"moon_separation":86.5,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.92,"best_label":"good","best_window":"22:35\u201305:30","dark_hours":9.77,"date":"2041-02-26","moon_free_dark_hours":9.48,"moon_illumination":20,"moon_separation":100.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.83,"best_label":"good","best_window":"22:35\u201305:25","dark_hours":9.72,"date":"2041-02-27","moon_free_dark_hours":9.7,"moon_illumination":11,"moon_separation":115.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.92,"best_label":"good","best_window":"22:30\u201305:25","dark_hours":9.68,"date":"2041-02-28","moon_free_dark_hours":9.67,"moon_illumination":5,"moon_separation":130.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.0,"best_label":"good","best_window":"22:25\u201305:25","dark_hours":9.63,"date":"2041-03-01","moon_free_dark_hours":9.62,"moon_illumination":1,"moon_separation":145.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.08,"best_label":"good","best_window":"22:20\u201305:25","dark_hours":9.58,"date":"2041-03-02","moon_free_dark_hours":9.57,"moon_illumination":0,"moon_separation":161.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.08,"best_label":"good","best_window":"22:15\u201305:20","dark_hours":9.54,"date":"2041-03-03","moon_free_dark_hours":9.52,"moon_illumination":3,"moon_separation":175.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.08,"best_label":"good","best_window":"22:15\u201305:20","dark_hours":9.49,"date":"2041-03-04","moon_free_dark_hours":8.77,"moon_illumination":8,"moon_separation":169.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.17,"best_label":"good","best_window":"22:10\u201305:20","dark_hours":9.45,"date":"2041-03-05","moon_free_dark_hours":7.5,"moon_illumination":15,"moon_separation":155.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.17,"best_label":"good","best_window":"22:05\u201305:15","dark_hours":9.4,"date":"2041-03-06","moon_free_dark_hours":6.27,"moon_illumination":23,"moon_separation":141.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.17,"best_label":"good","best_window":"22:05\u201305:15","dark_hours":9.35,"date":"2041-03-07","moon_free_dark_hours":5.07,"moon_illumination":33,"moon_separation":128.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.17,"best_label":"good","best_window":"22:05\u201305:15","dark_hours":9.3,"date":"2041-03-08","moon_free_dark_hours":3.9,"moon_illumination":43,"moon_separation":115.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.08,"best_label":"good","best_window":"22:05\u201305:10","dark_hours":9.25,"date":"2041-03-09","moon_free_dark_hours":2.82,"moon_illumination":53,"moon_separation":102.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.0,"best_label":"good","best_window":"22:10\u201305:10","dark_hours":9.21,"date":"2041-03-10","moon_free_dark_hours":1.83,"moon_illumination":62,"moon_separation":90.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":50.1,"transit_local":"01:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.17,"best_label":"good","best_window":"23:00\u201305:10","dark_hours":9.16,"date":"2041-03-11","moon_free_dark_hours":1.02,"moon_illumination":71,"moon_separation":78.5,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":50.1,"transit_local":"01:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.17,"best_label":"good","best_window":"00:55\u201305:05","dark_hours":9.11,"date":"2041-03-12","moon_free_dark_hours":0.3,"moon_illumination":80,"moon_separation":66.6,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":50.1,"transit_local":"01:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.42,"best_label":"marginal","best_window":"21:40\u201305:05","dark_hours":9.06,"date":"2041-03-13","moon_free_dark_hours":0.0,"moon_illumination":86,"moon_separation":54.8,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":50.1,"transit_local":"01:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.92,"best_label":"marginal","best_window":"22:05\u201305:00","dark_hours":9.01,"date":"2041-03-14","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":43.0,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":50.1,"transit_local":"01:20","verdict":"unknown","weather_source":"none","weekday":"Thu"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2041-02-13","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}}