{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.08,"best_label":"good","best_window":"23:10\u201300:15","dark_hours":4.48,"date":"2026-06-13","moon_free_dark_hours":4.47,"moon_illumination":2,"moon_separation":119.3,"score":30,"score_astronomy":33,"score_weather":91,"transit_alt":50.2,"transit_local":"20:25","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.92,"best_label":"good","best_window":"23:10\u201300:05","dark_hours":4.46,"date":"2026-06-14","moon_free_dark_hours":4.45,"moon_illumination":0,"moon_separation":104.2,"score":30,"score_astronomy":31,"score_weather":98,"transit_alt":50.2,"transit_local":"20:20","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.5,"best_label":"good","best_window":"23:10\u201323:40","dark_hours":4.45,"date":"2026-06-15","moon_free_dark_hours":4.43,"moon_illumination":1,"moon_separation":89.1,"score":22,"score_astronomy":29,"score_weather":76,"transit_alt":50.2,"transit_local":"20:15","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2026-06-16","moon_free_dark_hours":4.43,"moon_illumination":5,"moon_separation":74.2,"score":0,"score_astronomy":28,"score_weather":0,"transit_alt":50.2,"transit_local":"20:10","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2026-06-17","moon_free_dark_hours":4.18,"moon_illumination":12,"moon_separation":59.6,"score":0,"score_astronomy":26,"score_weather":0,"transit_alt":50.2,"transit_local":"20:10","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.42,"best_label":"good","best_window":"23:10\u201323:35","dark_hours":4.43,"date":"2026-06-18","moon_free_dark_hours":3.65,"moon_illumination":20,"moon_separation":45.4,"score":18,"score_astronomy":22,"score_weather":81,"transit_alt":50.2,"transit_local":"20:05","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":1.17,"best_label":"marginal","best_window":"23:10\u201300:20","dark_hours":4.42,"date":"2026-06-19","moon_free_dark_hours":3.22,"moon_illumination":30,"moon_separation":31.8,"score":15,"score_astronomy":18,"score_weather":83,"transit_alt":50.2,"transit_local":"20:00","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.08,"best_label":"good","best_window":"23:15\u201323:20","dark_hours":4.42,"date":"2026-06-20","moon_free_dark_hours":2.85,"moon_illumination":40,"moon_separation":19.1,"score":13,"score_astronomy":14,"score_weather":94,"transit_alt":50.2,"transit_local":"19:55","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.92,"best_label":"marginal","best_window":"23:15\u201300:10","dark_hours":4.42,"date":"2026-06-21","moon_free_dark_hours":2.5,"moon_illumination":50,"moon_separation":8.9,"score":11,"score_astronomy":11,"score_weather":98,"transit_alt":50.2,"transit_local":"19:50","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.75,"best_label":"marginal","best_window":"23:15\u201300:00","dark_hours":4.42,"date":"2026-06-22","moon_free_dark_hours":2.17,"moon_illumination":60,"moon_separation":11.1,"score":7,"score_astronomy":8,"score_weather":90,"transit_alt":50.2,"transit_local":"19:50","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2026-06-23","moon_free_dark_hours":1.83,"moon_illumination":70,"moon_separation":21.7,"score":2,"score_astronomy":6,"score_weather":30,"transit_alt":50.2,"transit_local":"19:45","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.33,"best_label":"marginal","best_window":"23:15\u201323:35","dark_hours":4.43,"date":"2026-06-24","moon_free_dark_hours":1.43,"moon_illumination":78,"moon_separation":33.3,"score":3,"score_astronomy":5,"score_weather":67,"transit_alt":50.2,"transit_local":"19:40","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.33,"best_label":"marginal","best_window":"23:15\u201323:35","dark_hours":4.44,"date":"2026-06-25","moon_free_dark_hours":0.98,"moon_illumination":86,"moon_separation":45.1,"score":4,"score_astronomy":5,"score_weather":81,"transit_alt":50.2,"transit_local":"19:35","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.42,"best_label":"marginal","best_window":"23:15\u201323:40","dark_hours":4.45,"date":"2026-06-26","moon_free_dark_hours":0.43,"moon_illumination":92,"moon_separation":56.8,"score":4,"score_astronomy":5,"score_weather":88,"transit_alt":50.2,"transit_local":"19:30","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.33,"best_label":"marginal","best_window":"23:15\u201323:35","dark_hours":4.47,"date":"2026-06-27","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":68.5,"score":4,"score_astronomy":5,"score_weather":86,"transit_alt":50.2,"transit_local":"19:30","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.42,"best_label":"marginal","best_window":"23:15\u201323:40","dark_hours":4.48,"date":"2026-06-28","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":80.2,"score":5,"score_astronomy":5,"score_weather":100,"transit_alt":50.2,"transit_local":"19:25","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.5,"best_label":"marginal","best_window":"23:10\u201323:40","dark_hours":4.5,"date":"2026-06-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":91.9,"score":5,"score_astronomy":6,"score_weather":89,"transit_alt":50.2,"transit_local":"19:20","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.58,"best_label":"marginal","best_window":"22:20\u201322:55","dark_hours":4.52,"date":"2026-06-30","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":103.7,"score":6,"score_astronomy":6,"score_weather":98,"transit_alt":50.2,"transit_local":"19:15","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.54,"date":"2026-07-01","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":115.7,"score":2,"score_astronomy":7,"score_weather":23,"transit_alt":50.2,"transit_local":"19:15","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.08,"best_label":"marginal","best_window":"23:10\u201323:15","dark_hours":4.56,"date":"2026-07-02","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":127.7,"score":4,"score_astronomy":6,"score_weather":62,"transit_alt":50.2,"transit_local":"19:10","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.58,"date":"2026-07-03","moon_free_dark_hours":0.17,"moon_illumination":86,"moon_separation":139.8,"score":0,"score_astronomy":6,"score_weather":7,"transit_alt":50.2,"transit_local":"19:05","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.61,"date":"2026-07-04","moon_free_dark_hours":0.53,"moon_illumination":78,"moon_separation":151.9,"score":3,"score_astronomy":5,"score_weather":57,"transit_alt":50.2,"transit_local":"19:00","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.25,"best_label":"marginal","best_window":"22:20\u201322:35","dark_hours":4.64,"date":"2026-07-05","moon_free_dark_hours":0.88,"moon_illumination":70,"moon_separation":163.7,"score":4,"score_astronomy":4,"score_weather":88,"transit_alt":50.2,"transit_local":"18:55","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.33,"best_label":"marginal","best_window":"22:20\u201322:40","dark_hours":4.67,"date":"2026-07-06","moon_free_dark_hours":1.23,"moon_illumination":59,"moon_separation":172.2,"score":4,"score_astronomy":4,"score_weather":94,"transit_alt":50.2,"transit_local":"18:55","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.08,"best_label":"marginal","best_window":"22:15\u201322:20","dark_hours":4.7,"date":"2026-07-07","moon_free_dark_hours":1.62,"moon_illumination":49,"moon_separation":165.7,"score":3,"score_astronomy":3,"score_weather":84,"transit_alt":50.2,"transit_local":"18:50","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.73,"date":"2026-07-08","moon_free_dark_hours":2.07,"moon_illumination":38,"moon_separation":153.1,"score":0,"score_astronomy":3,"score_weather":0,"transit_alt":50.2,"transit_local":"18:45","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.76,"date":"2026-07-09","moon_free_dark_hours":2.6,"moon_illumination":27,"moon_separation":139.4,"score":2,"score_astronomy":3,"score_weather":79,"transit_alt":50.2,"transit_local":"18:40","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.8,"date":"2026-07-10","moon_free_dark_hours":3.3,"moon_illumination":17,"moon_separation":125.2,"score":1,"score_astronomy":2,"score_weather":64,"transit_alt":50.2,"transit_local":"18:35","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"22:15\u201322:25","dark_hours":4.84,"date":"2026-07-11","moon_free_dark_hours":4.18,"moon_illumination":9,"moon_separation":110.5,"score":2,"score_astronomy":2,"score_weather":100,"transit_alt":50.2,"transit_local":"18:35","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.87,"date":"2026-07-12","moon_free_dark_hours":4.87,"moon_illumination":3,"moon_separation":95.7,"score":2,"score_astronomy":2,"score_weather":78,"transit_alt":50.2,"transit_local":"18:30","verdict":"poor","weather_source":"history","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2026-06-13","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}}