{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.75,"best_label":"marginal","best_window":"22:20\u201323:05","dark_hours":4.47,"date":"2028-06-27","moon_free_dark_hours":3.7,"moon_illumination":32,"moon_separation":21.9,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":50.2,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.58,"best_label":"marginal","best_window":"23:10\u201323:45","dark_hours":4.49,"date":"2028-06-28","moon_free_dark_hours":3.3,"moon_illumination":43,"moon_separation":11.2,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":50.2,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.5,"best_label":"marginal","best_window":"23:10\u201323:40","dark_hours":4.51,"date":"2028-06-29","moon_free_dark_hours":2.88,"moon_illumination":55,"moon_separation":13.0,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":50.2,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.25,"best_label":"marginal","best_window":"23:10\u201323:25","dark_hours":4.53,"date":"2028-06-30","moon_free_dark_hours":2.4,"moon_illumination":66,"moon_separation":24.5,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":50.2,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"23:10\u201323:20","dark_hours":4.55,"date":"2028-07-01","moon_free_dark_hours":1.87,"moon_illumination":76,"moon_separation":37.4,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":50.2,"transit_local":"19:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"marginal","best_window":"23:10\u201323:15","dark_hours":4.57,"date":"2028-07-02","moon_free_dark_hours":1.23,"moon_illumination":85,"moon_separation":50.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"19:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.08,"best_label":"marginal","best_window":"23:10\u201323:15","dark_hours":4.6,"date":"2028-07-03","moon_free_dark_hours":0.48,"moon_illumination":92,"moon_separation":63.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"19:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.08,"best_label":"marginal","best_window":"23:10\u201323:15","dark_hours":4.62,"date":"2028-07-04","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":76.4,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"19:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.08,"best_label":"marginal","best_window":"23:10\u201323:15","dark_hours":4.65,"date":"2028-07-05","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":89.1,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.17,"best_label":"marginal","best_window":"22:15\u201322:25","dark_hours":4.68,"date":"2028-07-06","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":101.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.25,"best_label":"marginal","best_window":"22:15\u201322:30","dark_hours":4.71,"date":"2028-07-07","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":113.8,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.25,"best_label":"marginal","best_window":"22:15\u201322:30","dark_hours":4.75,"date":"2028-07-08","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":125.8,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.25,"best_label":"marginal","best_window":"22:15\u201322:30","dark_hours":4.78,"date":"2028-07-09","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":137.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"marginal","best_window":"22:15\u201322:25","dark_hours":4.82,"date":"2028-07-10","moon_free_dark_hours":0.0,"moon_illumination":84,"moon_separation":149.0,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.17,"best_label":"marginal","best_window":"22:15\u201322:25","dark_hours":4.86,"date":"2028-07-11","moon_free_dark_hours":0.22,"moon_illumination":77,"moon_separation":159.8,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.08,"best_label":"marginal","best_window":"22:15\u201322:20","dark_hours":4.9,"date":"2028-07-12","moon_free_dark_hours":0.57,"moon_illumination":68,"moon_separation":168.6,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.94,"date":"2028-07-13","moon_free_dark_hours":0.95,"moon_illumination":59,"moon_separation":168.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.98,"date":"2028-07-14","moon_free_dark_hours":1.37,"moon_illumination":49,"moon_separation":159.6,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"18:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.02,"date":"2028-07-15","moon_free_dark_hours":1.85,"moon_illumination":40,"moon_separation":148.3,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"18:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.06,"date":"2028-07-16","moon_free_dark_hours":2.4,"moon_illumination":30,"moon_separation":136.3,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.11,"date":"2028-07-17","moon_free_dark_hours":3.1,"moon_illumination":21,"moon_separation":123.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.15,"date":"2028-07-18","moon_free_dark_hours":3.98,"moon_illumination":13,"moon_separation":110.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.2,"date":"2028-07-19","moon_free_dark_hours":5.02,"moon_illumination":6,"moon_separation":97.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"18:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.25,"date":"2028-07-20","moon_free_dark_hours":5.23,"moon_illumination":2,"moon_separation":83.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"17:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.3,"date":"2028-07-21","moon_free_dark_hours":5.28,"moon_illumination":0,"moon_separation":68.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.35,"date":"2028-07-22","moon_free_dark_hours":5.33,"moon_illumination":1,"moon_separation":54.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.4,"date":"2028-07-23","moon_free_dark_hours":5.38,"moon_illumination":5,"moon_separation":40.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.45,"date":"2028-07-24","moon_free_dark_hours":5.43,"moon_illumination":11,"moon_separation":25.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.5,"date":"2028-07-25","moon_free_dark_hours":5.48,"moon_illumination":20,"moon_separation":13.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.55,"date":"2028-07-26","moon_free_dark_hours":5.38,"moon_illumination":30,"moon_separation":11.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Wed"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2028-06-27","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}}