{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":6.58,"best_label":"good","best_window":"23:05\u201305:40","dark_hours":10.05,"date":"2048-02-20","moon_free_dark_hours":4.7,"moon_illumination":42,"moon_separation":132.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.5,"best_label":"good","best_window":"23:05\u201305:35","dark_hours":10.01,"date":"2048-02-21","moon_free_dark_hours":3.72,"moon_illumination":51,"moon_separation":121.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.5,"best_label":"good","best_window":"23:05\u201305:35","dark_hours":9.97,"date":"2048-02-22","moon_free_dark_hours":2.82,"moon_illumination":61,"moon_separation":109.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"02:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.42,"best_label":"good","best_window":"23:10\u201305:35","dark_hours":9.93,"date":"2048-02-23","moon_free_dark_hours":1.98,"moon_illumination":70,"moon_separation":97.7,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":50.1,"transit_local":"02:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.83,"best_label":"good","best_window":"23:45\u201305:35","dark_hours":9.88,"date":"2048-02-24","moon_free_dark_hours":1.27,"moon_illumination":78,"moon_separation":85.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":50.1,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.17,"best_label":"good","best_window":"01:20\u201305:30","dark_hours":9.84,"date":"2048-02-25","moon_free_dark_hours":0.62,"moon_illumination":86,"moon_separation":73.5,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":50.1,"transit_local":"02:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.33,"best_label":"good","best_window":"04:10\u201305:30","dark_hours":9.8,"date":"2048-02-26","moon_free_dark_hours":0.05,"moon_illumination":92,"moon_separation":61.1,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":50.1,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.5,"best_label":"marginal","best_window":"23:00\u201305:30","dark_hours":9.75,"date":"2048-02-27","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":48.3,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":50.1,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.25,"best_label":"marginal","best_window":"01:10\u201305:25","dark_hours":9.71,"date":"2048-02-28","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":35.4,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":50.1,"transit_local":"02:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.25,"best_label":"marginal","best_window":"02:10\u201305:25","dark_hours":9.66,"date":"2048-02-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":22.7,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.1,"transit_local":"02:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.67,"best_label":"marginal","best_window":"22:45\u201305:25","dark_hours":9.62,"date":"2048-03-01","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":11.8,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":50.1,"transit_local":"02:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.08,"best_label":"marginal","best_window":"22:15\u201305:20","dark_hours":9.57,"date":"2048-03-02","moon_free_dark_hours":1.02,"moon_illumination":93,"moon_separation":12.3,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":50.1,"transit_local":"02:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.5,"best_label":"marginal","best_window":"21:50\u201305:20","dark_hours":9.52,"date":"2048-03-03","moon_free_dark_hours":2.22,"moon_illumination":86,"moon_separation":23.7,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":50.1,"transit_local":"02:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.08,"best_label":"good","best_window":"22:10\u201323:15","dark_hours":9.48,"date":"2048-03-04","moon_free_dark_hours":3.45,"moon_illumination":77,"moon_separation":37.0,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":50.1,"transit_local":"02:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.08,"best_label":"good","best_window":"22:10\u201304:15","dark_hours":9.43,"date":"2048-03-05","moon_free_dark_hours":4.63,"moon_illumination":67,"moon_separation":50.9,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":50.1,"transit_local":"01:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.17,"best_label":"good","best_window":"22:05\u201305:15","dark_hours":9.38,"date":"2048-03-06","moon_free_dark_hours":5.75,"moon_illumination":56,"moon_separation":64.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.25,"best_label":"good","best_window":"22:00\u201305:15","dark_hours":9.34,"date":"2048-03-07","moon_free_dark_hours":6.75,"moon_illumination":44,"moon_separation":78.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.25,"best_label":"good","best_window":"21:55\u201305:10","dark_hours":9.29,"date":"2048-03-08","moon_free_dark_hours":7.58,"moon_illumination":34,"moon_separation":92.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.25,"best_label":"good","best_window":"21:55\u201305:10","dark_hours":9.24,"date":"2048-03-09","moon_free_dark_hours":8.27,"moon_illumination":23,"moon_separation":106.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.33,"best_label":"good","best_window":"21:50\u201305:10","dark_hours":9.19,"date":"2048-03-10","moon_free_dark_hours":8.83,"moon_illumination":15,"moon_separation":119.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.33,"best_label":"good","best_window":"21:45\u201305:05","dark_hours":9.14,"date":"2048-03-11","moon_free_dark_hours":9.12,"moon_illumination":8,"moon_separation":132.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.42,"best_label":"good","best_window":"21:40\u201305:05","dark_hours":9.09,"date":"2048-03-12","moon_free_dark_hours":9.07,"moon_illumination":3,"moon_separation":145.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.5,"best_label":"good","best_window":"21:35\u201305:05","dark_hours":9.04,"date":"2048-03-13","moon_free_dark_hours":9.03,"moon_illumination":1,"moon_separation":158.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.42,"best_label":"good","best_window":"21:35\u201305:00","dark_hours":8.99,"date":"2048-03-14","moon_free_dark_hours":8.98,"moon_illumination":0,"moon_separation":168.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.5,"best_label":"good","best_window":"21:30\u201305:00","dark_hours":8.94,"date":"2048-03-15","moon_free_dark_hours":8.92,"moon_illumination":2,"moon_separation":168.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.58,"best_label":"good","best_window":"21:25\u201305:00","dark_hours":8.89,"date":"2048-03-16","moon_free_dark_hours":8.28,"moon_illumination":6,"moon_separation":159.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.58,"best_label":"good","best_window":"21:20\u201304:55","dark_hours":8.84,"date":"2048-03-17","moon_free_dark_hours":7.23,"moon_illumination":11,"moon_separation":148.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.58,"best_label":"good","best_window":"21:20\u201304:55","dark_hours":8.79,"date":"2048-03-18","moon_free_dark_hours":6.18,"moon_illumination":18,"moon_separation":136.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.58,"best_label":"good","best_window":"21:15\u201304:50","dark_hours":8.74,"date":"2048-03-19","moon_free_dark_hours":5.18,"moon_illumination":25,"moon_separation":125.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"01:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.58,"best_label":"good","best_window":"21:15\u201304:50","dark_hours":8.69,"date":"2048-03-20","moon_free_dark_hours":4.23,"moon_illumination":34,"moon_separation":113.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:55","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":"2048-02-20","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}}