{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.75,"date":"2025-11-08","moon_free_dark_hours":0.73,"moon_illumination":84,"moon_separation":34.4,"score":0,"score_astronomy":51,"score_weather":0,"transit_alt":72.5,"transit_local":"00:55","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.78,"date":"2025-11-09","moon_free_dark_hours":1.95,"moon_illumination":74,"moon_separation":48.8,"score":3,"score_astronomy":83,"score_weather":3,"transit_alt":72.5,"transit_local":"00:50","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.82,"date":"2025-11-10","moon_free_dark_hours":3.22,"moon_illumination":64,"moon_separation":62.7,"score":0,"score_astronomy":93,"score_weather":0,"transit_alt":72.5,"transit_local":"00:50","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":9.58,"best_label":"good","best_window":"19:55\u201305:30","dark_hours":10.85,"date":"2025-11-11","moon_free_dark_hours":4.45,"moon_illumination":53,"moon_separation":76.2,"score":98,"score_astronomy":100,"score_weather":98,"transit_alt":72.5,"transit_local":"00:45","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":8.58,"best_label":"good","best_window":"21:00\u201305:35","dark_hours":10.88,"date":"2025-11-12","moon_free_dark_hours":5.62,"moon_illumination":43,"moon_separation":89.2,"score":90,"score_astronomy":100,"score_weather":90,"transit_alt":72.5,"transit_local":"00:40","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":8.5,"best_label":"good","best_window":"19:30\u201304:00","dark_hours":10.91,"date":"2025-11-13","moon_free_dark_hours":6.73,"moon_illumination":33,"moon_separation":101.9,"score":92,"score_astronomy":100,"score_weather":92,"transit_alt":72.5,"transit_local":"00:35","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":10.17,"best_label":"good","best_window":"19:25\u201305:35","dark_hours":10.94,"date":"2025-11-14","moon_free_dark_hours":7.8,"moon_illumination":24,"moon_separation":114.3,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":72.5,"transit_local":"00:30","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":3.58,"best_label":"good","best_window":"19:25\u201323:00","dark_hours":10.97,"date":"2025-11-15","moon_free_dark_hours":8.85,"moon_illumination":16,"moon_separation":126.5,"score":59,"score_astronomy":100,"score_weather":59,"transit_alt":72.5,"transit_local":"00:30","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":1.92,"best_label":"marginal","best_window":"19:05\u201321:00","dark_hours":10.99,"date":"2025-11-16","moon_free_dark_hours":9.9,"moon_illumination":10,"moon_separation":138.6,"score":23,"score_astronomy":100,"score_weather":23,"transit_alt":72.5,"transit_local":"00:25","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.02,"date":"2025-11-17","moon_free_dark_hours":10.95,"moon_illumination":5,"moon_separation":150.5,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":72.5,"transit_local":"00:20","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.05,"date":"2025-11-18","moon_free_dark_hours":11.03,"moon_illumination":2,"moon_separation":162.3,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":72.5,"transit_local":"00:15","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":1.0,"best_label":"marginal","best_window":"02:00\u201303:00","dark_hours":11.08,"date":"2025-11-19","moon_free_dark_hours":11.07,"moon_illumination":0,"moon_separation":174.1,"score":5,"score_astronomy":100,"score_weather":5,"transit_alt":72.5,"transit_local":"00:10","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":1.0,"best_label":"marginal","best_window":"22:00\u201323:00","dark_hours":11.1,"date":"2025-11-20","moon_free_dark_hours":11.1,"moon_illumination":0,"moon_separation":173.9,"score":9,"score_astronomy":100,"score_weather":9,"transit_alt":72.5,"transit_local":"00:10","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.13,"date":"2025-11-21","moon_free_dark_hours":11.12,"moon_illumination":3,"moon_separation":162.1,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":72.5,"transit_local":"00:05","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":1.0,"best_label":"good","best_window":"20:00\u201321:00","dark_hours":11.15,"date":"2025-11-22","moon_free_dark_hours":11.13,"moon_illumination":6,"moon_separation":150.2,"score":14,"score_astronomy":100,"score_weather":14,"transit_alt":72.5,"transit_local":"00:00","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":10.08,"best_label":"good","best_window":"19:00\u201305:05","dark_hours":11.17,"date":"2025-11-23","moon_free_dark_hours":10.85,"moon_illumination":12,"moon_separation":138.2,"score":99,"score_astronomy":100,"score_weather":99,"transit_alt":72.5,"transit_local":"23:55","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":7.17,"best_label":"good","best_window":"18:50\u201302:00","dark_hours":11.2,"date":"2025-11-24","moon_free_dark_hours":9.82,"moon_illumination":18,"moon_separation":126.1,"score":71,"score_astronomy":100,"score_weather":71,"transit_alt":72.5,"transit_local":"23:55","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.22,"date":"2025-11-25","moon_free_dark_hours":8.73,"moon_illumination":27,"moon_separation":113.8,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":72.5,"transit_local":"23:50","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":1.0,"best_label":"marginal","best_window":"21:00\u201322:00","dark_hours":11.24,"date":"2025-11-26","moon_free_dark_hours":7.62,"moon_illumination":36,"moon_separation":101.2,"score":3,"score_astronomy":100,"score_weather":3,"transit_alt":72.5,"transit_local":"23:45","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.26,"date":"2025-11-27","moon_free_dark_hours":6.48,"moon_illumination":46,"moon_separation":88.4,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":72.5,"transit_local":"23:40","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.28,"date":"2025-11-28","moon_free_dark_hours":5.35,"moon_illumination":57,"moon_separation":75.1,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":72.5,"transit_local":"23:35","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.3,"date":"2025-11-29","moon_free_dark_hours":4.18,"moon_illumination":67,"moon_separation":61.5,"score":0,"score_astronomy":99,"score_weather":0,"transit_alt":72.5,"transit_local":"23:35","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.32,"date":"2025-11-30","moon_free_dark_hours":2.97,"moon_illumination":78,"moon_separation":47.4,"score":0,"score_astronomy":89,"score_weather":0,"transit_alt":72.5,"transit_local":"23:30","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":7.0,"best_label":"marginal","best_window":"19:00\u201302:00","dark_hours":11.34,"date":"2025-12-01","moon_free_dark_hours":1.7,"moon_illumination":86,"moon_separation":32.8,"score":49,"score_astronomy":77,"score_weather":64,"transit_alt":72.5,"transit_local":"23:25","verdict":"marginal","weather_source":"history","weekday":"Mon"},{"best_hours":2.67,"best_label":"marginal","best_window":"02:00\u201304:40","dark_hours":11.35,"date":"2025-12-02","moon_free_dark_hours":0.35,"moon_illumination":94,"moon_separation":17.9,"score":20,"score_astronomy":37,"score_weather":54,"transit_alt":72.5,"transit_local":"23:20","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.37,"date":"2025-12-03","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":2.8,"score":2,"score_astronomy":24,"score_weather":8,"transit_alt":72.5,"transit_local":"23:15","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.38,"date":"2025-12-04","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":12.6,"score":0,"score_astronomy":24,"score_weather":0,"transit_alt":72.5,"transit_local":"23:15","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.4,"date":"2025-12-05","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":27.8,"score":0,"score_astronomy":30,"score_weather":0,"transit_alt":72.5,"transit_local":"23:10","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.41,"date":"2025-12-06","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":42.8,"score":0,"score_astronomy":53,"score_weather":0,"transit_alt":72.5,"transit_local":"23:05","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.42,"date":"2025-12-07","moon_free_dark_hours":1.0,"moon_illumination":88,"moon_separation":57.3,"score":2,"score_astronomy":89,"score_weather":2,"transit_alt":72.5,"transit_local":"23:00","verdict":"poor","weather_source":"history","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2025-11-08","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"}}