{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.6,"date":"2026-10-10","moon_free_dark_hours":9.58,"moon_illumination":0,"moon_separation":17.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"12:35","verdict":"unusable","weather_source":"forecast","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.64,"date":"2026-10-11","moon_free_dark_hours":9.63,"moon_illumination":2,"moon_separation":29.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"12:30","verdict":"unusable","weather_source":"forecast","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.69,"date":"2026-10-12","moon_free_dark_hours":9.67,"moon_illumination":6,"moon_separation":41.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"12:30","verdict":"unusable","weather_source":"forecast","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.73,"date":"2026-10-13","moon_free_dark_hours":9.72,"moon_illumination":11,"moon_separation":53.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"12:25","verdict":"unusable","weather_source":"forecast","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.78,"date":"2026-10-14","moon_free_dark_hours":9.7,"moon_illumination":17,"moon_separation":65.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.82,"date":"2026-10-15","moon_free_dark_hours":8.97,"moon_illumination":25,"moon_separation":77.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.86,"date":"2026-10-16","moon_free_dark_hours":8.12,"moon_illumination":34,"moon_separation":89.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.91,"date":"2026-10-17","moon_free_dark_hours":7.15,"moon_illumination":43,"moon_separation":100.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.95,"date":"2026-10-18","moon_free_dark_hours":6.12,"moon_illumination":52,"moon_separation":112.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.99,"date":"2026-10-19","moon_free_dark_hours":5.05,"moon_illumination":62,"moon_separation":124.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.03,"date":"2026-10-20","moon_free_dark_hours":4.0,"moon_illumination":71,"moon_separation":136.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.08,"date":"2026-10-21","moon_free_dark_hours":2.92,"moon_illumination":80,"moon_separation":148.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.12,"date":"2026-10-22","moon_free_dark_hours":1.82,"moon_illumination":87,"moon_separation":160.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.16,"date":"2026-10-23","moon_free_dark_hours":0.67,"moon_illumination":94,"moon_separation":171.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.2,"date":"2026-10-24","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":167.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.24,"date":"2026-10-25","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":155.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.28,"date":"2026-10-26","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":141.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.31,"date":"2026-10-27","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":126.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.35,"date":"2026-10-28","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":112.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.39,"date":"2026-10-29","moon_free_dark_hours":0.77,"moon_illumination":81,"moon_separation":97.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.43,"date":"2026-10-30","moon_free_dark_hours":1.95,"moon_illumination":71,"moon_separation":83.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.47,"date":"2026-10-31","moon_free_dark_hours":3.23,"moon_illumination":60,"moon_separation":69.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.5,"date":"2026-11-01","moon_free_dark_hours":4.52,"moon_illumination":49,"moon_separation":55.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.54,"date":"2026-11-02","moon_free_dark_hours":5.77,"moon_illumination":38,"moon_separation":41.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.57,"date":"2026-11-03","moon_free_dark_hours":6.97,"moon_illumination":28,"moon_separation":28.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":50.2,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.61,"date":"2026-11-04","moon_free_dark_hours":8.13,"moon_illumination":19,"moon_separation":16.4,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.64,"date":"2026-11-05","moon_free_dark_hours":9.27,"moon_illumination":12,"moon_separation":8.0,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.68,"date":"2026-11-06","moon_free_dark_hours":10.4,"moon_illumination":6,"moon_separation":14.0,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":50.2,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"marginal","best_window":"05:25\u201305:30","dark_hours":10.71,"date":"2026-11-07","moon_free_dark_hours":10.7,"moon_illumination":2,"moon_separation":25.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":50.2,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"marginal","best_window":"05:20\u201305:30","dark_hours":10.74,"date":"2026-11-08","moon_free_dark_hours":10.73,"moon_illumination":0,"moon_separation":37.6,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":50.2,"transit_local":"09:40","verdict":"unknown","weather_source":"none","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":"2026-10-10","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}}
