{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.75,"best_label":"good","best_window":"19:50\u201322:35","dark_hours":9.55,"date":"2038-03-03","moon_free_dark_hours":9.55,"moon_illumination":4,"moon_separation":99.2,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":72.5,"transit_local":"17:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"19:50\u201322:30","dark_hours":9.5,"date":"2038-03-04","moon_free_dark_hours":9.48,"moon_illumination":1,"moon_separation":87.1,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":72.5,"transit_local":"17:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.58,"best_label":"good","best_window":"19:50\u201322:25","dark_hours":9.46,"date":"2038-03-05","moon_free_dark_hours":9.43,"moon_illumination":0,"moon_separation":75.1,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":72.5,"transit_local":"17:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.58,"best_label":"good","best_window":"19:50\u201322:25","dark_hours":9.41,"date":"2038-03-06","moon_free_dark_hours":9.4,"moon_illumination":1,"moon_separation":63.2,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":72.5,"transit_local":"17:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"19:55\u201322:20","dark_hours":9.36,"date":"2038-03-07","moon_free_dark_hours":9.35,"moon_illumination":4,"moon_separation":51.4,"score":null,"score_astronomy":61,"score_weather":null,"transit_alt":72.5,"transit_local":"17:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.33,"best_label":"good","best_window":"19:55\u201322:15","dark_hours":9.32,"date":"2038-03-08","moon_free_dark_hours":8.55,"moon_illumination":8,"moon_separation":39.8,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":72.5,"transit_local":"17:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"19:55\u201322:10","dark_hours":9.27,"date":"2038-03-09","moon_free_dark_hours":7.57,"moon_illumination":14,"moon_separation":28.4,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":72.5,"transit_local":"17:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"good","best_window":"19:55\u201322:00","dark_hours":9.22,"date":"2038-03-10","moon_free_dark_hours":6.55,"moon_illumination":21,"moon_separation":17.4,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":72.5,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.83,"best_label":"good","best_window":"20:00\u201321:50","dark_hours":9.17,"date":"2038-03-11","moon_free_dark_hours":5.53,"moon_illumination":29,"moon_separation":8.6,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":72.5,"transit_local":"16:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.58,"best_label":"good","best_window":"20:00\u201321:35","dark_hours":9.12,"date":"2038-03-12","moon_free_dark_hours":4.52,"moon_illumination":38,"moon_separation":11.5,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":72.5,"transit_local":"16:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.33,"best_label":"marginal","best_window":"20:00\u201322:20","dark_hours":9.07,"date":"2038-03-13","moon_free_dark_hours":3.52,"moon_illumination":48,"moon_separation":22.1,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":72.5,"transit_local":"16:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.08,"best_label":"marginal","best_window":"20:00\u201322:05","dark_hours":9.02,"date":"2038-03-14","moon_free_dark_hours":2.52,"moon_illumination":58,"moon_separation":34.2,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":72.5,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.92,"best_label":"marginal","best_window":"20:05\u201322:00","dark_hours":8.97,"date":"2038-03-15","moon_free_dark_hours":1.57,"moon_illumination":68,"moon_separation":46.9,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.5,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.83,"best_label":"marginal","best_window":"20:05\u201321:55","dark_hours":8.92,"date":"2038-03-16","moon_free_dark_hours":0.7,"moon_illumination":78,"moon_separation":60.2,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.5,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.83,"best_label":"marginal","best_window":"20:05\u201321:55","dark_hours":8.87,"date":"2038-03-17","moon_free_dark_hours":0.0,"moon_illumination":86,"moon_separation":74.0,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":72.5,"transit_local":"16:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.08,"best_label":"good","best_window":"20:05\u201320:10","dark_hours":8.82,"date":"2038-03-18","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":88.3,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":72.5,"transit_local":"16:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.92,"best_label":"good","best_window":"20:10\u201321:05","dark_hours":8.77,"date":"2038-03-19","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":103.0,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":72.5,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.08,"best_label":"good","best_window":"20:10\u201321:15","dark_hours":8.72,"date":"2038-03-20","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":117.9,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":72.5,"transit_local":"16:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.08,"best_label":"good","best_window":"20:10\u201321:15","dark_hours":8.67,"date":"2038-03-21","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":132.9,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":72.5,"transit_local":"16:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.0,"best_label":"good","best_window":"20:10\u201321:10","dark_hours":8.61,"date":"2038-03-22","moon_free_dark_hours":0.32,"moon_illumination":95,"moon_separation":147.7,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":72.5,"transit_local":"16:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.0,"best_label":"good","best_window":"20:15\u201321:15","dark_hours":8.56,"date":"2038-03-23","moon_free_dark_hours":1.58,"moon_illumination":88,"moon_separation":161.9,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":72.5,"transit_local":"16:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.92,"best_label":"good","best_window":"20:15\u201321:10","dark_hours":8.51,"date":"2038-03-24","moon_free_dark_hours":2.82,"moon_illumination":79,"moon_separation":172.0,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":72.5,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.92,"best_label":"good","best_window":"20:15\u201321:10","dark_hours":8.46,"date":"2038-03-25","moon_free_dark_hours":4.0,"moon_illumination":69,"moon_separation":165.4,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":72.5,"transit_local":"15:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.83,"best_label":"good","best_window":"20:15\u201321:05","dark_hours":8.4,"date":"2038-03-26","moon_free_dark_hours":5.07,"moon_illumination":59,"moon_separation":152.7,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":72.5,"transit_local":"15:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.67,"best_label":"good","best_window":"20:20\u201321:00","dark_hours":8.35,"date":"2038-03-27","moon_free_dark_hours":6.05,"moon_illumination":48,"moon_separation":139.7,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":72.5,"transit_local":"15:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.58,"best_label":"good","best_window":"21:20\u201321:55","dark_hours":8.3,"date":"2038-03-28","moon_free_dark_hours":6.88,"moon_illumination":38,"moon_separation":127.0,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":72.5,"transit_local":"16:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.5,"best_label":"good","best_window":"21:20\u201321:50","dark_hours":8.24,"date":"2038-03-29","moon_free_dark_hours":7.58,"moon_illumination":28,"moon_separation":114.4,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":72.5,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"good","best_window":"21:20\u201321:50","dark_hours":8.19,"date":"2038-03-30","moon_free_dark_hours":8.17,"moon_illumination":20,"moon_separation":102.1,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":72.5,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.33,"best_label":"good","best_window":"21:25\u201321:45","dark_hours":8.13,"date":"2038-03-31","moon_free_dark_hours":8.12,"moon_illumination":12,"moon_separation":90.0,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.5,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.25,"best_label":"good","best_window":"21:25\u201321:40","dark_hours":8.08,"date":"2038-04-01","moon_free_dark_hours":8.05,"moon_illumination":7,"moon_separation":78.1,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.5,"transit_local":"16:30","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":"2038-03-03","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"}}