{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":5.17,"best_label":"good","best_window":"22:05\u201303:15","dark_hours":6.5,"date":"2036-04-28","moon_free_dark_hours":6.08,"moon_illumination":8,"moon_separation":114.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"transit_local":"23:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.08,"best_label":"good","best_window":"22:05\u201303:10","dark_hours":6.45,"date":"2036-04-29","moon_free_dark_hours":4.97,"moon_illumination":15,"moon_separation":99.9,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":50.2,"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":6.39,"date":"2036-04-30","moon_free_dark_hours":3.92,"moon_illumination":25,"moon_separation":85.7,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":50.2,"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":6.33,"date":"2036-05-01","moon_free_dark_hours":2.95,"moon_illumination":35,"moon_separation":71.4,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":50.2,"transit_local":"23:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.83,"best_label":"good","best_window":"22:10\u201303:00","dark_hours":6.27,"date":"2036-05-02","moon_free_dark_hours":2.12,"moon_illumination":46,"moon_separation":57.2,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":50.2,"transit_local":"23:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.92,"best_label":"good","best_window":"22:35\u201302:30","dark_hours":6.21,"date":"2036-05-03","moon_free_dark_hours":1.38,"moon_illumination":58,"moon_separation":43.1,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":50.2,"transit_local":"23:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.0,"best_label":"marginal","best_window":"22:15\u201303:15","dark_hours":6.16,"date":"2036-05-04","moon_free_dark_hours":0.72,"moon_illumination":69,"moon_separation":29.1,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":50.2,"transit_local":"23:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.83,"best_label":"marginal","best_window":"22:15\u201303:05","dark_hours":6.1,"date":"2036-05-05","moon_free_dark_hours":0.12,"moon_illumination":78,"moon_separation":15.2,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":50.2,"transit_local":"22:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.42,"best_label":"marginal","best_window":"22:20\u201302:45","dark_hours":6.04,"date":"2036-05-06","moon_free_dark_hours":0.0,"moon_illumination":87,"moon_separation":1.9,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":50.2,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.17,"best_label":"marginal","best_window":"22:20\u201302:30","dark_hours":5.99,"date":"2036-05-07","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":12.3,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":50.2,"transit_local":"22:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.83,"best_label":"marginal","best_window":"22:20\u201302:10","dark_hours":5.93,"date":"2036-05-08","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":25.7,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":50.2,"transit_local":"22:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.83,"best_label":"marginal","best_window":"22:25\u201302:15","dark_hours":5.87,"date":"2036-05-09","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":38.9,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":50.2,"transit_local":"22:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.08,"best_label":"marginal","best_window":"22:25\u201302:30","dark_hours":5.82,"date":"2036-05-10","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":51.8,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":50.2,"transit_local":"22:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.17,"best_label":"good","best_window":"22:25\u201323:35","dark_hours":5.76,"date":"2036-05-11","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":64.5,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":50.2,"transit_local":"22:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.58,"best_label":"good","best_window":"22:30\u201301:05","dark_hours":5.71,"date":"2036-05-12","moon_free_dark_hours":0.2,"moon_illumination":93,"moon_separation":76.9,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":50.2,"transit_local":"22:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.33,"best_label":"good","best_window":"22:30\u201301:50","dark_hours":5.65,"date":"2036-05-13","moon_free_dark_hours":1.05,"moon_illumination":87,"moon_separation":89.1,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":50.2,"transit_local":"22:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.42,"best_label":"good","best_window":"22:30\u201301:55","dark_hours":5.6,"date":"2036-05-14","moon_free_dark_hours":1.83,"moon_illumination":80,"moon_separation":101.2,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":50.2,"transit_local":"22:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.42,"best_label":"good","best_window":"22:35\u201302:00","dark_hours":5.55,"date":"2036-05-15","moon_free_dark_hours":2.53,"moon_illumination":72,"moon_separation":113.1,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":50.2,"transit_local":"22:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.42,"best_label":"good","best_window":"22:35\u201302:00","dark_hours":5.49,"date":"2036-05-16","moon_free_dark_hours":3.13,"moon_illumination":63,"moon_separation":124.9,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":50.2,"transit_local":"22:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.42,"best_label":"good","best_window":"22:35\u201302:00","dark_hours":5.44,"date":"2036-05-17","moon_free_dark_hours":3.68,"moon_illumination":54,"moon_separation":136.8,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":50.2,"transit_local":"22:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.25,"best_label":"good","best_window":"22:40\u201301:55","dark_hours":5.39,"date":"2036-05-18","moon_free_dark_hours":4.18,"moon_illumination":45,"moon_separation":148.8,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":50.2,"transit_local":"22:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.17,"best_label":"good","best_window":"22:40\u201301:50","dark_hours":5.34,"date":"2036-05-19","moon_free_dark_hours":4.65,"moon_illumination":35,"moon_separation":160.9,"score":null,"score_astronomy":79,"score_weather":null,"transit_alt":50.2,"transit_local":"22:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.17,"best_label":"good","best_window":"22:40\u201301:50","dark_hours":5.29,"date":"2036-05-20","moon_free_dark_hours":5.12,"moon_illumination":26,"moon_separation":173.2,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":50.2,"transit_local":"21:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.0,"best_label":"good","best_window":"22:45\u201301:45","dark_hours":5.24,"date":"2036-05-21","moon_free_dark_hours":5.22,"moon_illumination":18,"moon_separation":173.8,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":50.2,"transit_local":"21:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"22:45\u201301:40","dark_hours":5.19,"date":"2036-05-22","moon_free_dark_hours":5.18,"moon_illumination":10,"moon_separation":160.8,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":50.2,"transit_local":"21:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"22:45\u201301:35","dark_hours":5.15,"date":"2036-05-23","moon_free_dark_hours":5.13,"moon_illumination":5,"moon_separation":147.3,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":50.2,"transit_local":"21:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.75,"best_label":"good","best_window":"22:45\u201301:30","dark_hours":5.1,"date":"2036-05-24","moon_free_dark_hours":5.08,"moon_illumination":1,"moon_separation":133.4,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.2,"transit_local":"21:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.67,"best_label":"good","best_window":"22:50\u201301:30","dark_hours":5.06,"date":"2036-05-25","moon_free_dark_hours":5.03,"moon_illumination":0,"moon_separation":119.2,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":50.2,"transit_local":"21:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.58,"best_label":"good","best_window":"22:50\u201301:25","dark_hours":5.01,"date":"2036-05-26","moon_free_dark_hours":5.0,"moon_illumination":2,"moon_separation":104.7,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":50.2,"transit_local":"21:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"good","best_window":"22:50\u201301:20","dark_hours":4.97,"date":"2036-05-27","moon_free_dark_hours":4.95,"moon_illumination":6,"moon_separation":90.1,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":50.2,"transit_local":"21:30","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":"2036-04-28","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}}