{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.51,"date":"2025-12-22","moon_free_dark_hours":11.2,"moon_illumination":8,"moon_separation":117.6,"score":0,"score_astronomy":76,"score_weather":0,"transit_alt":50.2,"transit_local":"06:45","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.51,"date":"2025-12-23","moon_free_dark_hours":10.08,"moon_illumination":14,"moon_separation":130.0,"score":0,"score_astronomy":78,"score_weather":0,"transit_alt":50.2,"transit_local":"06:40","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.5,"date":"2025-12-24","moon_free_dark_hours":8.95,"moon_illumination":21,"moon_separation":142.5,"score":0,"score_astronomy":79,"score_weather":0,"transit_alt":50.2,"transit_local":"06:35","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.5,"date":"2025-12-25","moon_free_dark_hours":7.82,"moon_illumination":30,"moon_separation":155.1,"score":3,"score_astronomy":82,"score_weather":4,"transit_alt":50.2,"transit_local":"06:30","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.08,"best_label":"marginal","best_window":"04:55\u201305:00","dark_hours":11.5,"date":"2025-12-26","moon_free_dark_hours":6.68,"moon_illumination":41,"moon_separation":167.2,"score":11,"score_astronomy":83,"score_weather":13,"transit_alt":50.2,"transit_local":"06:30","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":3.58,"best_label":"good","best_window":"02:35\u201306:10","dark_hours":11.49,"date":"2025-12-27","moon_free_dark_hours":5.53,"moon_illumination":51,"moon_separation":172.6,"score":85,"score_astronomy":85,"score_weather":100,"transit_alt":50.2,"transit_local":"06:25","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":3.58,"best_label":"good","best_window":"02:35\u201306:10","dark_hours":11.48,"date":"2025-12-28","moon_free_dark_hours":4.32,"moon_illumination":62,"moon_separation":162.0,"score":85,"score_astronomy":86,"score_weather":99,"transit_alt":50.2,"transit_local":"06:20","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":3.58,"best_label":"good","best_window":"02:35\u201306:10","dark_hours":11.48,"date":"2025-12-29","moon_free_dark_hours":3.05,"moon_illumination":73,"moon_separation":148.4,"score":87,"score_astronomy":87,"score_weather":100,"transit_alt":50.2,"transit_local":"06:15","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":1.17,"best_label":"good","best_window":"05:00\u201306:10","dark_hours":11.47,"date":"2025-12-30","moon_free_dark_hours":1.72,"moon_illumination":83,"moon_separation":134.1,"score":32,"score_astronomy":86,"score_weather":37,"transit_alt":50.2,"transit_local":"06:10","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":1.67,"best_label":"marginal","best_window":"02:20\u201304:00","dark_hours":11.46,"date":"2025-12-31","moon_free_dark_hours":0.4,"moon_illumination":91,"moon_separation":119.4,"score":29,"score_astronomy":83,"score_weather":35,"transit_alt":50.2,"transit_local":"06:10","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":2.33,"best_label":"good","best_window":"02:40\u201305:00","dark_hours":11.45,"date":"2026-01-01","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":104.6,"score":56,"score_astronomy":64,"score_weather":88,"transit_alt":50.2,"transit_local":"06:05","verdict":"marginal","weather_source":"history","weekday":"Thu"},{"best_hours":0.75,"best_label":"marginal","best_window":"02:15\u201303:00","dark_hours":11.44,"date":"2026-01-02","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":89.7,"score":7,"score_astronomy":50,"score_weather":14,"transit_alt":50.2,"transit_local":"06:00","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"06:00\u201306:10","dark_hours":11.43,"date":"2026-01-03","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":75.0,"score":4,"score_astronomy":37,"score_weather":10,"transit_alt":50.2,"transit_local":"05:55","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.42,"date":"2026-01-04","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":60.5,"score":0,"score_astronomy":27,"score_weather":0,"transit_alt":50.2,"transit_local":"05:50","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.4,"date":"2026-01-05","moon_free_dark_hours":0.88,"moon_illumination":92,"moon_separation":46.5,"score":2,"score_astronomy":20,"score_weather":9,"transit_alt":50.2,"transit_local":"05:50","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.39,"date":"2026-01-06","moon_free_dark_hours":2.1,"moon_illumination":84,"moon_separation":33.0,"score":1,"score_astronomy":18,"score_weather":7,"transit_alt":50.2,"transit_local":"05:45","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.37,"date":"2026-01-07","moon_free_dark_hours":3.23,"moon_illumination":76,"moon_separation":20.2,"score":0,"score_astronomy":23,"score_weather":0,"transit_alt":50.2,"transit_local":"05:40","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":4.58,"best_label":"marginal","best_window":"01:35\u201306:10","dark_hours":11.36,"date":"2026-01-08","moon_free_dark_hours":4.32,"moon_illumination":67,"moon_separation":9.3,"score":32,"score_astronomy":32,"score_weather":99,"transit_alt":50.2,"transit_local":"05:35","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.34,"date":"2026-01-09","moon_free_dark_hours":5.4,"moon_illumination":57,"moon_separation":9.4,"score":5,"score_astronomy":43,"score_weather":12,"transit_alt":50.2,"transit_local":"05:35","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":1.0,"best_label":"marginal","best_window":"02:00\u201303:00","dark_hours":11.32,"date":"2026-01-10","moon_free_dark_hours":6.43,"moon_illumination":47,"moon_separation":19.7,"score":10,"score_astronomy":55,"score_weather":19,"transit_alt":50.2,"transit_local":"05:30","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.31,"date":"2026-01-11","moon_free_dark_hours":7.48,"moon_illumination":38,"moon_separation":31.2,"score":0,"score_astronomy":77,"score_weather":0,"transit_alt":50.2,"transit_local":"05:25","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":4.58,"best_label":"good","best_window":"01:35\u201306:10","dark_hours":11.29,"date":"2026-01-12","moon_free_dark_hours":8.53,"moon_illumination":29,"moon_separation":42.8,"score":87,"score_astronomy":88,"score_weather":99,"transit_alt":50.2,"transit_local":"05:20","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":0.33,"best_label":"marginal","best_window":"01:40\u201302:00","dark_hours":11.27,"date":"2026-01-13","moon_free_dark_hours":9.57,"moon_illumination":21,"moon_separation":54.4,"score":12,"score_astronomy":92,"score_weather":13,"transit_alt":50.2,"transit_local":"05:15","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":4.75,"best_label":"good","best_window":"01:25\u201306:10","dark_hours":11.25,"date":"2026-01-14","moon_free_dark_hours":10.57,"moon_illumination":14,"moon_separation":66.1,"score":93,"score_astronomy":93,"score_weather":100,"transit_alt":50.2,"transit_local":"05:15","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":3.58,"best_label":"good","best_window":"01:25\u201305:00","dark_hours":11.23,"date":"2026-01-15","moon_free_dark_hours":11.22,"moon_illumination":8,"moon_separation":78.0,"score":74,"score_astronomy":93,"score_weather":79,"transit_alt":50.2,"transit_local":"05:10","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.2,"date":"2026-01-16","moon_free_dark_hours":11.18,"moon_illumination":4,"moon_separation":89.9,"score":0,"score_astronomy":93,"score_weather":0,"transit_alt":50.2,"transit_local":"05:05","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.18,"date":"2026-01-17","moon_free_dark_hours":11.17,"moon_illumination":1,"moon_separation":102.1,"score":1,"score_astronomy":93,"score_weather":1,"transit_alt":50.2,"transit_local":"05:00","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.16,"date":"2026-01-18","moon_free_dark_hours":11.15,"moon_illumination":0,"moon_separation":114.4,"score":0,"score_astronomy":93,"score_weather":0,"transit_alt":50.2,"transit_local":"04:55","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":4.92,"best_label":"good","best_window":"01:15\u201306:10","dark_hours":11.13,"date":"2026-01-19","moon_free_dark_hours":11.12,"moon_illumination":1,"moon_separation":126.9,"score":91,"score_astronomy":93,"score_weather":98,"transit_alt":50.2,"transit_local":"04:55","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.11,"date":"2026-01-20","moon_free_dark_hours":11.08,"moon_illumination":5,"moon_separation":139.6,"score":5,"score_astronomy":93,"score_weather":5,"transit_alt":50.2,"transit_local":"04:50","verdict":"poor","weather_source":"history","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2025-12-22","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}}