{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":6.92,"best_label":"good","best_window":"18:55\u201301:50","dark_hours":11.27,"date":"2043-01-13","moon_free_dark_hours":10.65,"moon_illumination":8,"moon_separation":93.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.83,"best_label":"good","best_window":"18:55\u201301:45","dark_hours":11.25,"date":"2043-01-14","moon_free_dark_hours":9.43,"moon_illumination":15,"moon_separation":79.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.75,"best_label":"good","best_window":"18:55\u201301:40","dark_hours":11.23,"date":"2043-01-15","moon_free_dark_hours":8.22,"moon_illumination":24,"moon_separation":65.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.67,"best_label":"good","best_window":"18:55\u201301:35","dark_hours":11.21,"date":"2043-01-16","moon_free_dark_hours":6.98,"moon_illumination":34,"moon_separation":52.0,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":72.6,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.58,"best_label":"good","best_window":"19:00\u201301:35","dark_hours":11.18,"date":"2043-01-17","moon_free_dark_hours":5.77,"moon_illumination":45,"moon_separation":37.9,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":72.5,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.25,"best_label":"good","best_window":"20:45\u201301:00","dark_hours":11.16,"date":"2043-01-18","moon_free_dark_hours":4.52,"moon_illumination":56,"moon_separation":23.8,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":72.5,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.75,"best_label":"marginal","best_window":"19:00\u201301:45","dark_hours":11.14,"date":"2043-01-19","moon_free_dark_hours":3.22,"moon_illumination":67,"moon_separation":9.6,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":72.6,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"marginal","best_window":"19:00\u201301:30","dark_hours":11.11,"date":"2043-01-20","moon_free_dark_hours":1.93,"moon_illumination":78,"moon_separation":4.6,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":72.6,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.0,"best_label":"marginal","best_window":"19:00\u201301:00","dark_hours":11.09,"date":"2043-01-21","moon_free_dark_hours":0.7,"moon_illumination":86,"moon_separation":18.7,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":72.6,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.83,"best_label":"marginal","best_window":"19:05\u201320:55","dark_hours":11.06,"date":"2043-01-22","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":32.8,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":72.5,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.75,"best_label":"marginal","best_window":"19:05\u201323:50","dark_hours":11.03,"date":"2043-01-23","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":46.7,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":72.5,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.83,"best_label":"marginal","best_window":"19:05\u201300:55","dark_hours":11.0,"date":"2043-01-24","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":60.5,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":72.6,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.5,"best_label":"good","best_window":"19:05\u201321:35","dark_hours":10.98,"date":"2043-01-25","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":73.9,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":72.6,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.17,"best_label":"good","best_window":"19:05\u201323:15","dark_hours":10.95,"date":"2043-01-26","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":87.1,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":72.5,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.33,"best_label":"good","best_window":"19:10\u201300:30","dark_hours":10.92,"date":"2043-01-27","moon_free_dark_hours":0.87,"moon_illumination":92,"moon_separation":100.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"19:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.42,"best_label":"good","best_window":"19:10\u201300:35","dark_hours":10.89,"date":"2043-01-28","moon_free_dark_hours":1.93,"moon_illumination":86,"moon_separation":112.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"19:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.42,"best_label":"good","best_window":"19:10\u201300:35","dark_hours":10.86,"date":"2043-01-29","moon_free_dark_hours":2.97,"moon_illumination":79,"moon_separation":124.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.42,"best_label":"good","best_window":"19:10\u201300:35","dark_hours":10.83,"date":"2043-01-30","moon_free_dark_hours":3.98,"moon_illumination":70,"moon_separation":136.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.33,"best_label":"good","best_window":"19:15\u201300:35","dark_hours":10.79,"date":"2043-01-31","moon_free_dark_hours":5.0,"moon_illumination":62,"moon_separation":148.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.33,"best_label":"good","best_window":"19:15\u201300:35","dark_hours":10.76,"date":"2043-02-01","moon_free_dark_hours":6.03,"moon_illumination":52,"moon_separation":160.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.25,"best_label":"good","best_window":"19:15\u201300:30","dark_hours":10.73,"date":"2043-02-02","moon_free_dark_hours":7.08,"moon_illumination":43,"moon_separation":172.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.17,"best_label":"good","best_window":"19:15\u201300:25","dark_hours":10.69,"date":"2043-02-03","moon_free_dark_hours":8.15,"moon_illumination":34,"moon_separation":175.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.08,"best_label":"good","best_window":"19:15\u201300:20","dark_hours":10.66,"date":"2043-02-04","moon_free_dark_hours":9.18,"moon_illumination":25,"moon_separation":163.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.0,"best_label":"good","best_window":"19:20\u201300:20","dark_hours":10.63,"date":"2043-02-05","moon_free_dark_hours":10.15,"moon_illumination":17,"moon_separation":151.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"19:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.92,"best_label":"good","best_window":"19:20\u201300:15","dark_hours":10.59,"date":"2043-02-06","moon_free_dark_hours":10.57,"moon_illumination":10,"moon_separation":138.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"19:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.83,"best_label":"good","best_window":"19:20\u201300:10","dark_hours":10.55,"date":"2043-02-07","moon_free_dark_hours":10.53,"moon_illumination":5,"moon_separation":125.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.75,"best_label":"good","best_window":"19:20\u201300:05","dark_hours":10.52,"date":"2043-02-08","moon_free_dark_hours":10.5,"moon_illumination":1,"moon_separation":111.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"18:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.58,"best_label":"good","best_window":"19:25\u201300:00","dark_hours":10.48,"date":"2043-02-09","moon_free_dark_hours":10.47,"moon_illumination":0,"moon_separation":98.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"18:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.58,"best_label":"good","best_window":"19:25\u201300:00","dark_hours":10.44,"date":"2043-02-10","moon_free_dark_hours":10.43,"moon_illumination":2,"moon_separation":84.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.5,"best_label":"good","best_window":"19:25\u201323:55","dark_hours":10.41,"date":"2043-02-11","moon_free_dark_hours":10.12,"moon_illumination":5,"moon_separation":69.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Wed"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2043-01-13","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"}}