{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.75,"best_label":"good","best_window":"03:35\u201304:20","dark_hours":5.68,"date":"2047-07-29","moon_free_dark_hours":4.55,"moon_illumination":50,"moon_separation":157.3,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":72.6,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.83,"best_label":"good","best_window":"03:30\u201304:20","dark_hours":5.73,"date":"2047-07-30","moon_free_dark_hours":3.92,"moon_illumination":62,"moon_separation":171.5,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":72.6,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.0,"best_label":"good","best_window":"03:25\u201304:25","dark_hours":5.79,"date":"2047-07-31","moon_free_dark_hours":3.17,"moon_illumination":72,"moon_separation":174.3,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":72.6,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.08,"best_label":"good","best_window":"03:20\u201304:25","dark_hours":5.84,"date":"2047-08-01","moon_free_dark_hours":2.23,"moon_illumination":82,"moon_separation":160.2,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":72.6,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"03:15\u201304:25","dark_hours":5.9,"date":"2047-08-02","moon_free_dark_hours":1.18,"moon_illumination":90,"moon_separation":146.2,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":72.6,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.17,"best_label":"good","best_window":"03:20\u201304:30","dark_hours":5.95,"date":"2047-08-03","moon_free_dark_hours":0.05,"moon_illumination":96,"moon_separation":132.3,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":72.6,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.17,"best_label":"good","best_window":"03:20\u201304:30","dark_hours":6.01,"date":"2047-08-04","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":118.6,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":72.6,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.08,"best_label":"good","best_window":"03:25\u201304:30","dark_hours":6.07,"date":"2047-08-05","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":105.1,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":72.6,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.67,"best_label":"good","best_window":"03:55\u201304:35","dark_hours":6.12,"date":"2047-08-06","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":92.0,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":72.6,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.92,"best_label":"marginal","best_window":"02:40\u201304:35","dark_hours":6.18,"date":"2047-08-07","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":79.1,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":72.6,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.83,"best_label":"marginal","best_window":"02:45\u201304:35","dark_hours":6.24,"date":"2047-08-08","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":66.5,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":72.6,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.92,"best_label":"marginal","best_window":"02:45\u201304:40","dark_hours":6.29,"date":"2047-08-09","moon_free_dark_hours":0.0,"moon_illumination":83,"moon_separation":54.2,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.6,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.0,"best_label":"marginal","best_window":"02:40\u201304:40","dark_hours":6.35,"date":"2047-08-10","moon_free_dark_hours":0.05,"moon_illumination":75,"moon_separation":42.1,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.6,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.08,"best_label":"marginal","best_window":"02:35\u201304:40","dark_hours":6.41,"date":"2047-08-11","moon_free_dark_hours":0.52,"moon_illumination":67,"moon_separation":30.1,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":72.6,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.42,"best_label":"marginal","best_window":"02:20\u201304:45","dark_hours":6.47,"date":"2047-08-12","moon_free_dark_hours":1.03,"moon_illumination":57,"moon_separation":18.3,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":72.6,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.33,"best_label":"good","best_window":"04:25\u201304:45","dark_hours":6.52,"date":"2047-08-13","moon_free_dark_hours":1.62,"moon_illumination":48,"moon_separation":6.4,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":72.6,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.83,"best_label":"good","best_window":"02:55\u201304:45","dark_hours":6.58,"date":"2047-08-14","moon_free_dark_hours":2.32,"moon_illumination":39,"moon_separation":5.5,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":72.6,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.08,"best_label":"good","best_window":"02:40\u201304:45","dark_hours":6.64,"date":"2047-08-15","moon_free_dark_hours":3.12,"moon_illumination":30,"moon_separation":17.6,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":72.6,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.33,"best_label":"good","best_window":"02:30\u201304:50","dark_hours":6.7,"date":"2047-08-16","moon_free_dark_hours":4.07,"moon_illumination":21,"moon_separation":29.9,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":72.6,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.5,"best_label":"good","best_window":"02:20\u201304:50","dark_hours":6.75,"date":"2047-08-17","moon_free_dark_hours":5.12,"moon_illumination":13,"moon_separation":42.5,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":72.6,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.58,"best_label":"good","best_window":"02:15\u201304:50","dark_hours":6.81,"date":"2047-08-18","moon_free_dark_hours":6.27,"moon_illumination":7,"moon_separation":55.5,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":72.6,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.75,"best_label":"good","best_window":"02:10\u201304:55","dark_hours":6.87,"date":"2047-08-19","moon_free_dark_hours":6.85,"moon_illumination":3,"moon_separation":68.8,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":72.6,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"02:05\u201304:55","dark_hours":6.93,"date":"2047-08-20","moon_free_dark_hours":6.92,"moon_illumination":0,"moon_separation":82.5,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":72.6,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"02:05\u201304:55","dark_hours":6.98,"date":"2047-08-21","moon_free_dark_hours":6.97,"moon_illumination":0,"moon_separation":96.5,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":72.6,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.0,"best_label":"good","best_window":"02:00\u201305:00","dark_hours":7.04,"date":"2047-08-22","moon_free_dark_hours":7.03,"moon_illumination":3,"moon_separation":110.7,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":72.6,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.08,"best_label":"good","best_window":"01:55\u201305:00","dark_hours":7.1,"date":"2047-08-23","moon_free_dark_hours":7.08,"moon_illumination":9,"moon_separation":125.0,"score":null,"score_astronomy":82,"score_weather":null,"transit_alt":72.6,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.17,"best_label":"good","best_window":"01:50\u201305:00","dark_hours":7.15,"date":"2047-08-24","moon_free_dark_hours":7.15,"moon_illumination":16,"moon_separation":139.5,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":72.6,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.25,"best_label":"good","best_window":"01:45\u201305:00","dark_hours":7.21,"date":"2047-08-25","moon_free_dark_hours":7.18,"moon_illumination":26,"moon_separation":153.9,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":72.6,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.33,"best_label":"good","best_window":"01:45\u201305:05","dark_hours":7.27,"date":"2047-08-26","moon_free_dark_hours":6.6,"moon_illumination":36,"moon_separation":168.2,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":72.6,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.42,"best_label":"good","best_window":"01:40\u201305:05","dark_hours":7.33,"date":"2047-08-27","moon_free_dark_hours":5.87,"moon_illumination":48,"moon_separation":177.5,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":72.6,"transit_local":"06:45","verdict":"unknown","weather_source":"none","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":"2047-07-29","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"}}