{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.58,"best_label":"good","best_window":"03:00\u201304:35","dark_hours":6.15,"date":"2041-08-06","moon_free_dark_hours":3.63,"moon_illumination":68,"moon_separation":174.0,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":72.5,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.67,"best_label":"good","best_window":"02:55\u201304:35","dark_hours":6.2,"date":"2041-08-07","moon_free_dark_hours":2.97,"moon_illumination":77,"moon_separation":160.8,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":72.5,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.75,"best_label":"good","best_window":"02:50\u201304:35","dark_hours":6.26,"date":"2041-08-08","moon_free_dark_hours":2.08,"moon_illumination":86,"moon_separation":146.9,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":72.5,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.75,"best_label":"good","best_window":"02:55\u201304:40","dark_hours":6.32,"date":"2041-08-09","moon_free_dark_hours":1.0,"moon_illumination":93,"moon_separation":132.5,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":72.5,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"02:55\u201304:40","dark_hours":6.38,"date":"2041-08-10","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":117.7,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":72.5,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.67,"best_label":"good","best_window":"03:00\u201304:40","dark_hours":6.43,"date":"2041-08-11","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":102.6,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":72.5,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.08,"best_label":"good","best_window":"03:40\u201304:45","dark_hours":6.49,"date":"2041-08-12","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":87.4,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":72.5,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"marginal","best_window":"02:15\u201304:45","dark_hours":6.55,"date":"2041-08-13","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":72.3,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":72.5,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.42,"best_label":"marginal","best_window":"02:20\u201304:45","dark_hours":6.61,"date":"2041-08-14","moon_free_dark_hours":0.02,"moon_illumination":88,"moon_separation":57.3,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":72.5,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.5,"best_label":"marginal","best_window":"02:20\u201304:50","dark_hours":6.66,"date":"2041-08-15","moon_free_dark_hours":0.47,"moon_illumination":79,"moon_separation":42.7,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":72.5,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.67,"best_label":"marginal","best_window":"02:10\u201304:50","dark_hours":6.72,"date":"2041-08-16","moon_free_dark_hours":0.92,"moon_illumination":69,"moon_separation":28.5,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":72.5,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"marginal","best_window":"01:55\u201304:50","dark_hours":6.78,"date":"2041-08-17","moon_free_dark_hours":1.4,"moon_illumination":59,"moon_separation":14.8,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":72.5,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.33,"best_label":"good","best_window":"03:35\u201304:55","dark_hours":6.84,"date":"2041-08-18","moon_free_dark_hours":1.95,"moon_illumination":48,"moon_separation":2.6,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":72.5,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":6.89,"date":"2041-08-19","moon_free_dark_hours":2.58,"moon_illumination":38,"moon_separation":12.0,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":72.5,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.67,"best_label":"good","best_window":"02:15\u201304:55","dark_hours":6.95,"date":"2041-08-20","moon_free_dark_hours":3.33,"moon_illumination":28,"moon_separation":24.5,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":72.5,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.92,"best_label":"good","best_window":"02:00\u201304:55","dark_hours":7.01,"date":"2041-08-21","moon_free_dark_hours":4.2,"moon_illumination":20,"moon_separation":36.9,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":72.5,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.08,"best_label":"good","best_window":"01:55\u201305:00","dark_hours":7.07,"date":"2041-08-22","moon_free_dark_hours":5.18,"moon_illumination":12,"moon_separation":49.1,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":72.5,"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":7.12,"date":"2041-08-23","moon_free_dark_hours":6.23,"moon_illumination":7,"moon_separation":61.1,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":72.5,"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":7.18,"date":"2041-08-24","moon_free_dark_hours":7.15,"moon_illumination":3,"moon_separation":73.0,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":72.5,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.33,"best_label":"good","best_window":"01:45\u201305:05","dark_hours":7.24,"date":"2041-08-25","moon_free_dark_hours":7.22,"moon_illumination":1,"moon_separation":84.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":72.5,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.42,"best_label":"good","best_window":"01:40\u201305:05","dark_hours":7.29,"date":"2041-08-26","moon_free_dark_hours":7.27,"moon_illumination":0,"moon_separation":96.7,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":72.5,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.5,"best_label":"good","best_window":"01:35\u201305:05","dark_hours":7.35,"date":"2041-08-27","moon_free_dark_hours":7.33,"moon_illumination":2,"moon_separation":108.5,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":72.5,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.5,"best_label":"good","best_window":"01:35\u201305:05","dark_hours":7.41,"date":"2041-08-28","moon_free_dark_hours":7.38,"moon_illumination":5,"moon_separation":120.3,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":72.5,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.67,"best_label":"good","best_window":"01:30\u201305:10","dark_hours":7.46,"date":"2041-08-29","moon_free_dark_hours":7.43,"moon_illumination":9,"moon_separation":132.2,"score":null,"score_astronomy":97,"score_weather":null,"transit_alt":72.5,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.75,"best_label":"good","best_window":"01:25\u201305:10","dark_hours":7.52,"date":"2041-08-30","moon_free_dark_hours":7.5,"moon_illumination":16,"moon_separation":144.2,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":72.5,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.83,"best_label":"good","best_window":"01:20\u201305:10","dark_hours":7.58,"date":"2041-08-31","moon_free_dark_hours":7.18,"moon_illumination":23,"moon_separation":156.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.0,"best_label":"good","best_window":"01:15\u201305:15","dark_hours":7.63,"date":"2041-09-01","moon_free_dark_hours":6.82,"moon_illumination":32,"moon_separation":168.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.0,"best_label":"good","best_window":"01:15\u201305:15","dark_hours":7.69,"date":"2041-09-02","moon_free_dark_hours":6.33,"moon_illumination":42,"moon_separation":177.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.08,"best_label":"good","best_window":"01:10\u201305:15","dark_hours":7.74,"date":"2041-09-03","moon_free_dark_hours":5.75,"moon_illumination":52,"moon_separation":165.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.17,"best_label":"good","best_window":"01:05\u201305:15","dark_hours":7.8,"date":"2041-09-04","moon_free_dark_hours":5.0,"moon_illumination":63,"moon_separation":152.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.5,"transit_local":"06:10","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":"2041-08-06","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"}}