{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.83,"best_label":"good","best_window":"22:45\u201301:35","dark_hours":5.13,"date":"2030-05-24","moon_free_dark_hours":3.43,"moon_illumination":43,"moon_separation":154.5,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":50.2,"transit_local":"21:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.67,"best_label":"good","best_window":"22:50\u201301:30","dark_hours":5.08,"date":"2030-05-25","moon_free_dark_hours":3.85,"moon_illumination":33,"moon_separation":165.2,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":50.2,"transit_local":"21:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.58,"best_label":"good","best_window":"22:50\u201301:25","dark_hours":5.04,"date":"2030-05-26","moon_free_dark_hours":4.25,"moon_illumination":24,"moon_separation":170.2,"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":2.5,"best_label":"good","best_window":"22:50\u201301:20","dark_hours":4.99,"date":"2030-05-27","moon_free_dark_hours":4.67,"moon_illumination":16,"moon_separation":163.6,"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":4.95,"date":"2030-05-28","moon_free_dark_hours":4.93,"moon_illumination":10,"moon_separation":153.1,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":50.2,"transit_local":"21:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.33,"best_label":"good","best_window":"22:55\u201301:15","dark_hours":4.91,"date":"2030-05-29","moon_free_dark_hours":4.88,"moon_illumination":5,"moon_separation":141.8,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":50.2,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.25,"best_label":"good","best_window":"22:55\u201301:10","dark_hours":4.87,"date":"2030-05-30","moon_free_dark_hours":4.85,"moon_illumination":2,"moon_separation":130.4,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":50.2,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.17,"best_label":"good","best_window":"22:55\u201301:05","dark_hours":4.83,"date":"2030-05-31","moon_free_dark_hours":4.82,"moon_illumination":0,"moon_separation":118.8,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":50.2,"transit_local":"21:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.08,"best_label":"good","best_window":"23:00\u201301:05","dark_hours":4.79,"date":"2030-06-01","moon_free_dark_hours":4.77,"moon_illumination":0,"moon_separation":107.2,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":50.2,"transit_local":"21:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.0,"best_label":"good","best_window":"23:00\u201301:00","dark_hours":4.76,"date":"2030-06-02","moon_free_dark_hours":4.73,"moon_illumination":2,"moon_separation":95.4,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":50.2,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.92,"best_label":"good","best_window":"23:00\u201300:55","dark_hours":4.73,"date":"2030-06-03","moon_free_dark_hours":4.7,"moon_illumination":6,"moon_separation":83.6,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":50.2,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.83,"best_label":"good","best_window":"23:00\u201300:50","dark_hours":4.69,"date":"2030-06-04","moon_free_dark_hours":4.52,"moon_illumination":12,"moon_separation":71.6,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":50.2,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.75,"best_label":"good","best_window":"23:00\u201300:45","dark_hours":4.66,"date":"2030-06-05","moon_free_dark_hours":3.95,"moon_illumination":19,"moon_separation":59.5,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":50.2,"transit_local":"20:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.67,"best_label":"good","best_window":"23:05\u201300:45","dark_hours":4.63,"date":"2030-06-06","moon_free_dark_hours":3.43,"moon_illumination":28,"moon_separation":47.3,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":50.2,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.33,"best_label":"good","best_window":"23:05\u201300:25","dark_hours":4.61,"date":"2030-06-07","moon_free_dark_hours":2.97,"moon_illumination":37,"moon_separation":35.0,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":50.2,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.08,"best_label":"good","best_window":"23:05\u201300:10","dark_hours":4.58,"date":"2030-06-08","moon_free_dark_hours":2.5,"moon_illumination":48,"moon_separation":22.8,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":50.2,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.92,"best_label":"marginal","best_window":"23:05\u201301:00","dark_hours":4.56,"date":"2030-06-09","moon_free_dark_hours":2.03,"moon_illumination":58,"moon_separation":12.1,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.2,"transit_local":"20:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.75,"best_label":"marginal","best_window":"23:05\u201300:50","dark_hours":4.53,"date":"2030-06-10","moon_free_dark_hours":1.52,"moon_illumination":69,"moon_separation":11.8,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":50.2,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.42,"best_label":"marginal","best_window":"23:10\u201300:35","dark_hours":4.51,"date":"2030-06-11","moon_free_dark_hours":0.95,"moon_illumination":79,"moon_separation":23.1,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":50.2,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.25,"best_label":"marginal","best_window":"23:10\u201300:25","dark_hours":4.5,"date":"2030-06-12","moon_free_dark_hours":0.27,"moon_illumination":88,"moon_separation":36.8,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":50.2,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.25,"best_label":"marginal","best_window":"23:10\u201300:25","dark_hours":4.48,"date":"2030-06-13","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":51.3,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":50.2,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.33,"best_label":"marginal","best_window":"23:10\u201300:30","dark_hours":4.46,"date":"2030-06-14","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":66.2,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":50.2,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.33,"best_label":"marginal","best_window":"23:10\u201300:30","dark_hours":4.45,"date":"2030-06-15","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":81.1,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":50.2,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.5,"best_label":"good","best_window":"23:10\u201323:40","dark_hours":4.44,"date":"2030-06-16","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":95.9,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":50.2,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.58,"best_label":"good","best_window":"23:10\u201323:45","dark_hours":4.43,"date":"2030-06-17","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":110.4,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":50.2,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.67,"best_label":"good","best_window":"23:10\u201323:50","dark_hours":4.43,"date":"2030-06-18","moon_free_dark_hours":0.03,"moon_illumination":86,"moon_separation":124.4,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.2,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.58,"best_label":"good","best_window":"23:10\u201323:45","dark_hours":4.42,"date":"2030-06-19","moon_free_dark_hours":0.58,"moon_illumination":78,"moon_separation":137.9,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":50.2,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.58,"best_label":"good","best_window":"23:15\u201323:50","dark_hours":4.42,"date":"2030-06-20","moon_free_dark_hours":1.03,"moon_illumination":68,"moon_separation":150.7,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":50.2,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.5,"best_label":"good","best_window":"23:15\u201323:45","dark_hours":4.42,"date":"2030-06-21","moon_free_dark_hours":1.48,"moon_illumination":58,"moon_separation":162.3,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":50.2,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.42,"best_label":"good","best_window":"23:15\u201323:40","dark_hours":4.42,"date":"2030-06-22","moon_free_dark_hours":1.92,"moon_illumination":48,"moon_separation":170.0,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":50.2,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Sat"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2030-05-24","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}}