{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":8.25,"best_label":"good","best_window":"20:05\u201304:20","dark_hours":10.64,"date":"2031-11-05","moon_free_dark_hours":3.62,"moon_illumination":63,"moon_separation":59.2,"score":null,"score_astronomy":94,"score_weather":null,"transit_alt":72.5,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":9.5,"best_label":"good","best_window":"20:00\u201305:30","dark_hours":10.67,"date":"2031-11-06","moon_free_dark_hours":4.58,"moon_illumination":54,"moon_separation":71.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"01:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":9.58,"best_label":"good","best_window":"19:55\u201305:30","dark_hours":10.7,"date":"2031-11-07","moon_free_dark_hours":5.55,"moon_illumination":44,"moon_separation":82.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"01:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":9.67,"best_label":"good","best_window":"19:50\u201305:30","dark_hours":10.74,"date":"2031-11-08","moon_free_dark_hours":6.55,"moon_illumination":35,"moon_separation":94.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"01:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":9.67,"best_label":"good","best_window":"19:50\u201305:30","dark_hours":10.77,"date":"2031-11-09","moon_free_dark_hours":7.55,"moon_illumination":26,"moon_separation":107.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":9.75,"best_label":"good","best_window":"19:45\u201305:30","dark_hours":10.8,"date":"2031-11-10","moon_free_dark_hours":8.58,"moon_illumination":17,"moon_separation":119.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.92,"best_label":"good","best_window":"19:40\u201305:35","dark_hours":10.83,"date":"2031-11-11","moon_free_dark_hours":9.67,"moon_illumination":10,"moon_separation":132.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":10.0,"best_label":"good","best_window":"19:35\u201305:35","dark_hours":10.86,"date":"2031-11-12","moon_free_dark_hours":10.78,"moon_illumination":5,"moon_separation":145.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":10.08,"best_label":"good","best_window":"19:30\u201305:35","dark_hours":10.89,"date":"2031-11-13","moon_free_dark_hours":10.88,"moon_illumination":1,"moon_separation":158.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":10.08,"best_label":"good","best_window":"19:30\u201305:35","dark_hours":10.92,"date":"2031-11-14","moon_free_dark_hours":10.92,"moon_illumination":0,"moon_separation":171.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":10.17,"best_label":"good","best_window":"19:25\u201305:35","dark_hours":10.95,"date":"2031-11-15","moon_free_dark_hours":10.93,"moon_illumination":1,"moon_separation":170.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":10.25,"best_label":"good","best_window":"19:20\u201305:35","dark_hours":10.98,"date":"2031-11-16","moon_free_dark_hours":10.97,"moon_illumination":6,"moon_separation":157.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":10.33,"best_label":"good","best_window":"19:15\u201305:35","dark_hours":11.01,"date":"2031-11-17","moon_free_dark_hours":10.13,"moon_illumination":12,"moon_separation":142.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":10.25,"best_label":"good","best_window":"19:15\u201305:30","dark_hours":11.04,"date":"2031-11-18","moon_free_dark_hours":9.02,"moon_illumination":21,"moon_separation":128.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":10.25,"best_label":"good","best_window":"19:10\u201305:25","dark_hours":11.06,"date":"2031-11-19","moon_free_dark_hours":7.85,"moon_illumination":31,"moon_separation":114.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":10.08,"best_label":"good","best_window":"19:15\u201305:20","dark_hours":11.09,"date":"2031-11-20","moon_free_dark_hours":6.7,"moon_illumination":42,"moon_separation":100.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":9.92,"best_label":"good","best_window":"19:20\u201305:15","dark_hours":11.11,"date":"2031-11-21","moon_free_dark_hours":5.55,"moon_illumination":54,"moon_separation":86.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":9.5,"best_label":"good","best_window":"19:45\u201305:15","dark_hours":11.14,"date":"2031-11-22","moon_free_dark_hours":4.43,"moon_illumination":64,"moon_separation":72.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.5,"best_label":"good","best_window":"21:40\u201305:10","dark_hours":11.16,"date":"2031-11-23","moon_free_dark_hours":3.33,"moon_illumination":75,"moon_separation":58.7,"score":null,"score_astronomy":97,"score_weather":null,"transit_alt":72.5,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.67,"best_label":"good","best_window":"01:25\u201305:05","dark_hours":11.19,"date":"2031-11-24","moon_free_dark_hours":2.25,"moon_illumination":83,"moon_separation":45.3,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":72.5,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"good","best_window":"04:35\u201305:00","dark_hours":11.21,"date":"2031-11-25","moon_free_dark_hours":1.18,"moon_illumination":90,"moon_separation":32.2,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":72.5,"transit_local":"23:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.0,"best_label":"marginal","best_window":"00:10\u201305:10","dark_hours":11.23,"date":"2031-11-26","moon_free_dark_hours":0.15,"moon_illumination":96,"moon_separation":19.5,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":72.5,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.83,"best_label":"marginal","best_window":"02:00\u201304:50","dark_hours":11.25,"date":"2031-11-27","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":7.8,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":72.5,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.42,"best_label":"marginal","best_window":"18:40\u201321:05","dark_hours":11.27,"date":"2031-11-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":8.3,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":72.5,"transit_local":"23:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.75,"best_label":"marginal","best_window":"18:35\u201322:20","dark_hours":11.29,"date":"2031-11-29","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":19.7,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":72.5,"transit_local":"23:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.33,"best_label":"marginal","best_window":"18:35\u201323:55","dark_hours":11.31,"date":"2031-11-30","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":31.7,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":72.5,"transit_local":"23:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.75,"best_label":"good","best_window":"18:35\u201319:20","dark_hours":11.33,"date":"2031-12-01","moon_free_dark_hours":0.77,"moon_illumination":92,"moon_separation":43.6,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":72.5,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.5,"best_label":"good","best_window":"18:35\u201323:05","dark_hours":11.34,"date":"2031-12-02","moon_free_dark_hours":1.7,"moon_illumination":86,"moon_separation":55.4,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":72.5,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.42,"best_label":"good","best_window":"18:35\u201302:00","dark_hours":11.36,"date":"2031-12-03","moon_free_dark_hours":2.63,"moon_illumination":79,"moon_separation":67.2,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":72.5,"transit_local":"23:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":8.83,"best_label":"good","best_window":"18:35\u201303:25","dark_hours":11.38,"date":"2031-12-04","moon_free_dark_hours":3.58,"moon_illumination":70,"moon_separation":79.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"23:15","verdict":"unknown","weather_source":"none","weekday":"Thu"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2031-11-05","target":{"common_name":"Seven Sisters","dec":24.11388889,"name":"Cl Melotte 22","ra":56.60083333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M45","source":"sesame","type":"OpC","type_text":"open cluster"}}