{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.9,"date":"2029-09-06","moon_free_dark_hours":7.88,"moon_illumination":3,"moon_separation":42.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.96,"date":"2029-09-07","moon_free_dark_hours":7.93,"moon_illumination":0,"moon_separation":29.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.01,"date":"2029-09-08","moon_free_dark_hours":8.0,"moon_illumination":0,"moon_separation":16.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.07,"date":"2029-09-09","moon_free_dark_hours":8.05,"moon_illumination":3,"moon_separation":10.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.12,"date":"2029-09-10","moon_free_dark_hours":8.1,"moon_illumination":9,"moon_separation":19.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.17,"date":"2029-09-11","moon_free_dark_hours":8.15,"moon_illumination":17,"moon_separation":33.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.23,"date":"2029-09-12","moon_free_dark_hours":7.83,"moon_illumination":27,"moon_separation":47.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.28,"date":"2029-09-13","moon_free_dark_hours":7.03,"moon_illumination":37,"moon_separation":61.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.33,"date":"2029-09-14","moon_free_dark_hours":6.12,"moon_illumination":48,"moon_separation":74.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.39,"date":"2029-09-15","moon_free_dark_hours":5.1,"moon_illumination":60,"moon_separation":88.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.44,"date":"2029-09-16","moon_free_dark_hours":4.03,"moon_illumination":70,"moon_separation":101.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.49,"date":"2029-09-17","moon_free_dark_hours":2.95,"moon_illumination":79,"moon_separation":114.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.54,"date":"2029-09-18","moon_free_dark_hours":1.87,"moon_illumination":86,"moon_separation":126.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.59,"date":"2029-09-19","moon_free_dark_hours":0.82,"moon_illumination":93,"moon_separation":139.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.65,"date":"2029-09-20","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":151.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.7,"date":"2029-09-21","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":162.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.75,"date":"2029-09-22","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":169.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.8,"date":"2029-09-23","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":166.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.85,"date":"2029-09-24","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":157.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.9,"date":"2029-09-25","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":146.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.95,"date":"2029-09-26","moon_free_dark_hours":0.03,"moon_illumination":84,"moon_separation":134.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.0,"date":"2029-09-27","moon_free_dark_hours":0.68,"moon_illumination":77,"moon_separation":123.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.05,"date":"2029-09-28","moon_free_dark_hours":1.45,"moon_illumination":69,"moon_separation":111.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.1,"date":"2029-09-29","moon_free_dark_hours":2.33,"moon_illumination":59,"moon_separation":99.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.14,"date":"2029-09-30","moon_free_dark_hours":3.32,"moon_illumination":50,"moon_separation":87.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.19,"date":"2029-10-01","moon_free_dark_hours":4.38,"moon_illumination":39,"moon_separation":74.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.24,"date":"2029-10-02","moon_free_dark_hours":5.52,"moon_illumination":29,"moon_separation":61.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.29,"date":"2029-10-03","moon_free_dark_hours":6.7,"moon_illumination":20,"moon_separation":48.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.34,"date":"2029-10-04","moon_free_dark_hours":7.93,"moon_illumination":12,"moon_separation":35.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.38,"date":"2029-10-05","moon_free_dark_hours":9.18,"moon_illumination":5,"moon_separation":21.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:55","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":"2029-09-06","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}}