{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":7.08,"best_label":"marginal","best_window":"21:35\u201304:40","dark_hours":7.7,"date":"2047-04-08","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":12.6,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":50.1,"transit_local":"00:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.92,"best_label":"marginal","best_window":"21:35\u201304:30","dark_hours":7.64,"date":"2047-04-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":11.9,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.1,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.75,"best_label":"marginal","best_window":"21:35\u201304:20","dark_hours":7.58,"date":"2047-04-10","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":24.2,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":50.1,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.17,"best_label":"good","best_window":"21:40\u201321:50","dark_hours":7.53,"date":"2047-04-11","moon_free_dark_hours":0.23,"moon_illumination":96,"moon_separation":38.6,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":50.1,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.25,"best_label":"good","best_window":"21:40\u201300:55","dark_hours":7.47,"date":"2047-04-12","moon_free_dark_hours":1.52,"moon_illumination":91,"moon_separation":53.2,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":50.1,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.42,"best_label":"good","best_window":"21:40\u201303:05","dark_hours":7.41,"date":"2047-04-13","moon_free_dark_hours":2.72,"moon_illumination":83,"moon_separation":67.5,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.08,"best_label":"good","best_window":"21:45\u201303:50","dark_hours":7.36,"date":"2047-04-14","moon_free_dark_hours":3.7,"moon_illumination":73,"moon_separation":81.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.17,"best_label":"good","best_window":"21:45\u201303:55","dark_hours":7.3,"date":"2047-04-15","moon_free_dark_hours":4.52,"moon_illumination":63,"moon_separation":95.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.17,"best_label":"good","best_window":"21:45\u201303:55","dark_hours":7.24,"date":"2047-04-16","moon_free_dark_hours":5.15,"moon_illumination":52,"moon_separation":108.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.17,"best_label":"good","best_window":"21:45\u201303:55","dark_hours":7.18,"date":"2047-04-17","moon_free_dark_hours":5.67,"moon_illumination":42,"moon_separation":121.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.08,"best_label":"good","best_window":"21:50\u201303:55","dark_hours":7.12,"date":"2047-04-18","moon_free_dark_hours":6.08,"moon_illumination":32,"moon_separation":133.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.08,"best_label":"good","best_window":"21:50\u201303:55","dark_hours":7.07,"date":"2047-04-19","moon_free_dark_hours":6.47,"moon_illumination":23,"moon_separation":145.2,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.0,"best_label":"good","best_window":"21:50\u201303:50","dark_hours":7.01,"date":"2047-04-20","moon_free_dark_hours":6.8,"moon_illumination":16,"moon_separation":156.5,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.83,"best_label":"good","best_window":"21:55\u201303:45","dark_hours":6.95,"date":"2047-04-21","moon_free_dark_hours":6.93,"moon_illumination":10,"moon_separation":166.5,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.75,"best_label":"good","best_window":"21:55\u201303:40","dark_hours":6.89,"date":"2047-04-22","moon_free_dark_hours":6.88,"moon_illumination":5,"moon_separation":170.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.67,"best_label":"good","best_window":"21:55\u201303:35","dark_hours":6.83,"date":"2047-04-23","moon_free_dark_hours":6.82,"moon_illumination":2,"moon_separation":162.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.58,"best_label":"good","best_window":"22:00\u201303:35","dark_hours":6.78,"date":"2047-04-24","moon_free_dark_hours":6.77,"moon_illumination":0,"moon_separation":152.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.5,"best_label":"good","best_window":"22:00\u201303:30","dark_hours":6.72,"date":"2047-04-25","moon_free_dark_hours":6.7,"moon_illumination":1,"moon_separation":141.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.42,"best_label":"good","best_window":"22:00\u201303:25","dark_hours":6.66,"date":"2047-04-26","moon_free_dark_hours":6.65,"moon_illumination":3,"moon_separation":129.6,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.25,"best_label":"good","best_window":"22:05\u201303:20","dark_hours":6.6,"date":"2047-04-27","moon_free_dark_hours":5.88,"moon_illumination":7,"moon_separation":117.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.17,"best_label":"good","best_window":"22:05\u201303:15","dark_hours":6.54,"date":"2047-04-28","moon_free_dark_hours":4.93,"moon_illumination":12,"moon_separation":106.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.1,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.17,"best_label":"good","best_window":"22:05\u201303:15","dark_hours":6.48,"date":"2047-04-29","moon_free_dark_hours":4.08,"moon_illumination":19,"moon_separation":94.0,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":50.1,"transit_local":"23:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.0,"best_label":"good","best_window":"22:10\u201303:10","dark_hours":6.43,"date":"2047-04-30","moon_free_dark_hours":3.33,"moon_illumination":28,"moon_separation":81.7,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":50.1,"transit_local":"23:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.92,"best_label":"good","best_window":"22:10\u201303:05","dark_hours":6.37,"date":"2047-05-01","moon_free_dark_hours":2.68,"moon_illumination":37,"moon_separation":69.2,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":50.1,"transit_local":"23:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.83,"best_label":"good","best_window":"22:10\u201303:00","dark_hours":6.31,"date":"2047-05-02","moon_free_dark_hours":2.12,"moon_illumination":48,"moon_separation":56.4,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":50.1,"transit_local":"23:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.0,"best_label":"good","best_window":"22:35\u201302:35","dark_hours":6.25,"date":"2047-05-03","moon_free_dark_hours":1.6,"moon_illumination":58,"moon_separation":43.3,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":50.1,"transit_local":"23:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.08,"best_label":"marginal","best_window":"22:15\u201303:20","dark_hours":6.19,"date":"2047-05-04","moon_free_dark_hours":1.13,"moon_illumination":69,"moon_separation":30.1,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":50.1,"transit_local":"23:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.92,"best_label":"marginal","best_window":"22:15\u201303:10","dark_hours":6.14,"date":"2047-05-05","moon_free_dark_hours":0.65,"moon_illumination":79,"moon_separation":17.3,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":50.1,"transit_local":"23:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.58,"best_label":"marginal","best_window":"22:20\u201302:55","dark_hours":6.08,"date":"2047-05-06","moon_free_dark_hours":0.15,"moon_illumination":88,"moon_separation":9.7,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":50.1,"transit_local":"22:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.33,"best_label":"marginal","best_window":"22:20\u201302:40","dark_hours":6.02,"date":"2047-05-07","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":18.1,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.1,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2047-04-08","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}}
