{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":7.67,"best_label":"good","best_window":"21:30\u201305:10","dark_hours":8.16,"date":"2028-03-30","moon_free_dark_hours":5.03,"moon_illumination":21,"moon_separation":119.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"01:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.58,"best_label":"good","best_window":"21:30\u201305:05","dark_hours":8.11,"date":"2028-03-31","moon_free_dark_hours":3.98,"moon_illumination":30,"moon_separation":107.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.42,"best_label":"good","best_window":"21:35\u201305:00","dark_hours":8.05,"date":"2028-04-01","moon_free_dark_hours":3.03,"moon_illumination":40,"moon_separation":93.9,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":50.2,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.25,"best_label":"good","best_window":"21:40\u201304:55","dark_hours":8.0,"date":"2028-04-02","moon_free_dark_hours":2.23,"moon_illumination":51,"moon_separation":80.5,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":50.2,"transit_local":"01:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.17,"best_label":"good","best_window":"22:45\u201304:55","dark_hours":7.94,"date":"2028-04-03","moon_free_dark_hours":1.53,"moon_illumination":63,"moon_separation":66.7,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":50.2,"transit_local":"01:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.75,"best_label":"good","best_window":"01:35\u201304:20","dark_hours":7.89,"date":"2028-04-04","moon_free_dark_hours":0.93,"moon_illumination":73,"moon_separation":52.7,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":50.2,"transit_local":"00:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.75,"best_label":"marginal","best_window":"21:30\u201305:15","dark_hours":7.83,"date":"2028-04-05","moon_free_dark_hours":0.4,"moon_illumination":83,"moon_separation":38.5,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":50.2,"transit_local":"00:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.75,"best_label":"marginal","best_window":"22:10\u201304:55","dark_hours":7.78,"date":"2028-04-06","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":24.5,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":50.2,"transit_local":"00:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.08,"best_label":"marginal","best_window":"21:35\u201304:40","dark_hours":7.72,"date":"2028-04-07","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":12.2,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":50.2,"transit_local":"00:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.92,"best_label":"marginal","best_window":"21:35\u201304:30","dark_hours":7.66,"date":"2028-04-08","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":11.7,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.2,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.75,"best_label":"marginal","best_window":"21:35\u201304:20","dark_hours":7.61,"date":"2028-04-09","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":23.6,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":50.2,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.08,"best_label":"good","best_window":"21:40\u201321:45","dark_hours":7.55,"date":"2028-04-10","moon_free_dark_hours":0.15,"moon_illumination":97,"moon_separation":37.3,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":50.2,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.75,"best_label":"good","best_window":"21:40\u201300:25","dark_hours":7.49,"date":"2028-04-11","moon_free_dark_hours":1.38,"moon_illumination":92,"moon_separation":50.9,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":50.2,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.08,"best_label":"good","best_window":"21:40\u201302:45","dark_hours":7.44,"date":"2028-04-12","moon_free_dark_hours":2.5,"moon_illumination":85,"moon_separation":64.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.08,"best_label":"good","best_window":"21:40\u201303:45","dark_hours":7.38,"date":"2028-04-13","moon_free_dark_hours":3.47,"moon_illumination":76,"moon_separation":77.3,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.17,"best_label":"good","best_window":"21:45\u201303:55","dark_hours":7.32,"date":"2028-04-14","moon_free_dark_hours":4.27,"moon_illumination":67,"moon_separation":89.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.17,"best_label":"good","best_window":"21:45\u201303:55","dark_hours":7.26,"date":"2028-04-15","moon_free_dark_hours":4.93,"moon_illumination":57,"moon_separation":102.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.17,"best_label":"good","best_window":"21:45\u201303:55","dark_hours":7.21,"date":"2028-04-16","moon_free_dark_hours":5.43,"moon_illumination":48,"moon_separation":114.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.08,"best_label":"good","best_window":"21:50\u201303:55","dark_hours":7.15,"date":"2028-04-17","moon_free_dark_hours":5.88,"moon_illumination":38,"moon_separation":125.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.08,"best_label":"good","best_window":"21:50\u201303:55","dark_hours":7.09,"date":"2028-04-18","moon_free_dark_hours":6.23,"moon_illumination":29,"moon_separation":137.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.0,"best_label":"good","best_window":"21:50\u201303:50","dark_hours":7.03,"date":"2028-04-19","moon_free_dark_hours":6.58,"moon_illumination":21,"moon_separation":148.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.83,"best_label":"good","best_window":"21:55\u201303:45","dark_hours":6.97,"date":"2028-04-20","moon_free_dark_hours":6.88,"moon_illumination":14,"moon_separation":159.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.75,"best_label":"good","best_window":"21:55\u201303:40","dark_hours":6.92,"date":"2028-04-21","moon_free_dark_hours":6.9,"moon_illumination":8,"moon_separation":168.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.75,"best_label":"good","best_window":"21:55\u201303:40","dark_hours":6.86,"date":"2028-04-22","moon_free_dark_hours":6.83,"moon_illumination":4,"moon_separation":168.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.58,"best_label":"good","best_window":"22:00\u201303:35","dark_hours":6.8,"date":"2028-04-23","moon_free_dark_hours":6.77,"moon_illumination":1,"moon_separation":159.5,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.5,"best_label":"good","best_window":"22:00\u201303:30","dark_hours":6.74,"date":"2028-04-24","moon_free_dark_hours":6.73,"moon_illumination":0,"moon_separation":148.0,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.42,"best_label":"good","best_window":"22:00\u201303:25","dark_hours":6.68,"date":"2028-04-25","moon_free_dark_hours":6.67,"moon_illumination":1,"moon_separation":135.7,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.33,"best_label":"good","best_window":"22:00\u201303:20","dark_hours":6.62,"date":"2028-04-26","moon_free_dark_hours":6.32,"moon_illumination":5,"moon_separation":123.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.25,"best_label":"good","best_window":"22:05\u201303:20","dark_hours":6.57,"date":"2028-04-27","moon_free_dark_hours":5.23,"moon_illumination":10,"moon_separation":110.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.17,"best_label":"good","best_window":"22:05\u201303:15","dark_hours":6.51,"date":"2028-04-28","moon_free_dark_hours":4.23,"moon_illumination":18,"moon_separation":97.0,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":50.2,"transit_local":"23:20","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":"2028-03-30","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}}