{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.04,"date":"2026-07-16","moon_free_dark_hours":5.02,"moon_illumination":9,"moon_separation":37.1,"score":0,"score_astronomy":1,"score_weather":42,"transit_alt":50.2,"transit_local":"18:15","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.08,"date":"2026-07-17","moon_free_dark_hours":5.07,"moon_illumination":16,"moon_separation":23.7,"score":1,"score_astronomy":1,"score_weather":94,"transit_alt":50.2,"transit_local":"18:10","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.13,"date":"2026-07-18","moon_free_dark_hours":4.9,"moon_illumination":25,"moon_separation":11.8,"score":1,"score_astronomy":1,"score_weather":87,"transit_alt":50.2,"transit_local":"18:05","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.18,"date":"2026-07-19","moon_free_dark_hours":4.57,"moon_illumination":35,"moon_separation":8.9,"score":0,"score_astronomy":0,"score_weather":91,"transit_alt":50.2,"transit_local":"18:00","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.22,"date":"2026-07-20","moon_free_dark_hours":4.25,"moon_illumination":45,"moon_separation":18.5,"score":0,"score_astronomy":0,"score_weather":97,"transit_alt":50.2,"transit_local":"18:00","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.27,"date":"2026-07-21","moon_free_dark_hours":3.87,"moon_illumination":55,"moon_separation":30.1,"score":0,"score_astronomy":0,"score_weather":17,"transit_alt":50.2,"transit_local":"17:55","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.32,"date":"2026-07-22","moon_free_dark_hours":3.47,"moon_illumination":64,"moon_separation":41.9,"score":0,"score_astronomy":0,"score_weather":78,"transit_alt":50.2,"transit_local":"17:50","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.37,"date":"2026-07-23","moon_free_dark_hours":2.97,"moon_illumination":73,"moon_separation":53.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"17:45","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.42,"date":"2026-07-24","moon_free_dark_hours":2.37,"moon_illumination":81,"moon_separation":65.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"17:40","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.47,"date":"2026-07-25","moon_free_dark_hours":1.62,"moon_illumination":88,"moon_separation":77.1,"score":0,"score_astronomy":0,"score_weather":92,"transit_alt":50.2,"transit_local":"17:40","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.52,"date":"2026-07-26","moon_free_dark_hours":0.75,"moon_illumination":93,"moon_separation":88.8,"score":0,"score_astronomy":0,"score_weather":94,"transit_alt":50.2,"transit_local":"17:35","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.58,"date":"2026-07-27","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":100.6,"score":0,"score_astronomy":0,"score_weather":97,"transit_alt":50.2,"transit_local":"17:30","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.63,"date":"2026-07-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":112.6,"score":0,"score_astronomy":0,"score_weather":90,"transit_alt":50.2,"transit_local":"17:25","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.68,"date":"2026-07-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":124.6,"score":0,"score_astronomy":0,"score_weather":91,"transit_alt":50.2,"transit_local":"17:25","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.74,"date":"2026-07-30","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":136.8,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":50.2,"transit_local":"17:20","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.79,"date":"2026-07-31","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":149.0,"score":0,"score_astronomy":0,"score_weather":98,"transit_alt":50.2,"transit_local":"17:15","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.85,"date":"2026-08-01","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":161.1,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":50.2,"transit_local":"17:10","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.9,"date":"2026-08-02","moon_free_dark_hours":0.0,"moon_illumination":82,"moon_separation":171.0,"score":0,"score_astronomy":0,"score_weather":94,"transit_alt":50.2,"transit_local":"17:05","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.96,"date":"2026-08-03","moon_free_dark_hours":0.32,"moon_illumination":73,"moon_separation":168.2,"score":0,"score_astronomy":0,"score_weather":98,"transit_alt":50.2,"transit_local":"17:05","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.01,"date":"2026-08-04","moon_free_dark_hours":0.75,"moon_illumination":63,"moon_separation":156.4,"score":0,"score_astronomy":0,"score_weather":92,"transit_alt":50.2,"transit_local":"17:00","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.07,"date":"2026-08-05","moon_free_dark_hours":1.23,"moon_illumination":52,"moon_separation":143.2,"score":0,"score_astronomy":0,"score_weather":62,"transit_alt":50.2,"transit_local":"16:55","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.13,"date":"2026-08-06","moon_free_dark_hours":1.87,"moon_illumination":40,"moon_separation":129.5,"score":0,"score_astronomy":0,"score_weather":90,"transit_alt":50.2,"transit_local":"16:50","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.18,"date":"2026-08-07","moon_free_dark_hours":2.67,"moon_illumination":30,"moon_separation":115.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:45","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.24,"date":"2026-08-08","moon_free_dark_hours":3.67,"moon_illumination":19,"moon_separation":101.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:45","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.3,"date":"2026-08-09","moon_free_dark_hours":4.88,"moon_illumination":11,"moon_separation":86.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:40","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.35,"date":"2026-08-10","moon_free_dark_hours":6.22,"moon_illumination":5,"moon_separation":71.9,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:35","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.41,"date":"2026-08-11","moon_free_dark_hours":6.38,"moon_illumination":1,"moon_separation":57.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:30","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.47,"date":"2026-08-12","moon_free_dark_hours":6.45,"moon_illumination":0,"moon_separation":43.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:25","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.53,"date":"2026-08-13","moon_free_dark_hours":6.5,"moon_illumination":2,"moon_separation":29.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:25","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.58,"date":"2026-08-14","moon_free_dark_hours":6.57,"moon_illumination":6,"moon_separation":16.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":50.2,"transit_local":"16:20","verdict":"unusable","weather_source":"history","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":"2026-07-16","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}}