{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":7.25,"best_label":"good","best_window":"18:45\u201302:00","dark_hours":11.41,"date":"2048-01-05","moon_free_dark_hours":2.95,"moon_illumination":79,"moon_separation":100.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"21:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.25,"best_label":"good","best_window":"18:50\u201302:05","dark_hours":11.39,"date":"2048-01-06","moon_free_dark_hours":4.05,"moon_illumination":70,"moon_separation":113.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.33,"best_label":"good","best_window":"18:50\u201302:10","dark_hours":11.38,"date":"2048-01-07","moon_free_dark_hours":5.2,"moon_illumination":59,"moon_separation":126.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.25,"best_label":"good","best_window":"18:50\u201302:05","dark_hours":11.36,"date":"2048-01-08","moon_free_dark_hours":6.37,"moon_illumination":48,"moon_separation":140.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.25,"best_label":"good","best_window":"18:50\u201302:05","dark_hours":11.35,"date":"2048-01-09","moon_free_dark_hours":7.57,"moon_illumination":37,"moon_separation":154.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.17,"best_label":"good","best_window":"18:50\u201302:00","dark_hours":11.33,"date":"2048-01-10","moon_free_dark_hours":8.8,"moon_illumination":26,"moon_separation":169.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.08,"best_label":"good","best_window":"18:50\u201301:55","dark_hours":11.31,"date":"2048-01-11","moon_free_dark_hours":9.98,"moon_illumination":17,"moon_separation":176.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.0,"best_label":"good","best_window":"18:55\u201301:55","dark_hours":11.29,"date":"2048-01-12","moon_free_dark_hours":11.07,"moon_illumination":9,"moon_separation":161.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.92,"best_label":"good","best_window":"18:55\u201301:50","dark_hours":11.27,"date":"2048-01-13","moon_free_dark_hours":11.25,"moon_illumination":3,"moon_separation":147.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.83,"best_label":"good","best_window":"18:55\u201301:45","dark_hours":11.25,"date":"2048-01-14","moon_free_dark_hours":11.23,"moon_illumination":0,"moon_separation":132.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.75,"best_label":"good","best_window":"18:55\u201301:40","dark_hours":11.23,"date":"2048-01-15","moon_free_dark_hours":11.22,"moon_illumination":0,"moon_separation":118.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.75,"best_label":"good","best_window":"18:55\u201301:40","dark_hours":11.21,"date":"2048-01-16","moon_free_dark_hours":11.18,"moon_illumination":3,"moon_separation":103.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.58,"best_label":"good","best_window":"19:00\u201301:35","dark_hours":11.19,"date":"2048-01-17","moon_free_dark_hours":10.32,"moon_illumination":8,"moon_separation":90.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.5,"best_label":"good","best_window":"19:00\u201301:30","dark_hours":11.16,"date":"2048-01-18","moon_free_dark_hours":9.18,"moon_illumination":14,"moon_separation":76.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.42,"best_label":"good","best_window":"19:00\u201301:25","dark_hours":11.14,"date":"2048-01-19","moon_free_dark_hours":8.07,"moon_illumination":22,"moon_separation":63.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.33,"best_label":"good","best_window":"19:00\u201301:20","dark_hours":11.12,"date":"2048-01-20","moon_free_dark_hours":7.02,"moon_illumination":31,"moon_separation":51.1,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":72.6,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.33,"best_label":"good","best_window":"19:00\u201301:20","dark_hours":11.09,"date":"2048-01-21","moon_free_dark_hours":5.97,"moon_illumination":41,"moon_separation":38.9,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":72.6,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.75,"best_label":"good","best_window":"19:05\u201300:50","dark_hours":11.06,"date":"2048-01-22","moon_free_dark_hours":4.95,"moon_illumination":50,"moon_separation":26.8,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":72.6,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.5,"best_label":"marginal","best_window":"19:05\u201301:35","dark_hours":11.04,"date":"2048-01-23","moon_free_dark_hours":3.93,"moon_illumination":60,"moon_separation":15.0,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":72.6,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.33,"best_label":"marginal","best_window":"19:05\u201301:25","dark_hours":11.01,"date":"2048-01-24","moon_free_dark_hours":2.95,"moon_illumination":69,"moon_separation":3.3,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":72.6,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.08,"best_label":"marginal","best_window":"19:05\u201301:10","dark_hours":10.98,"date":"2048-01-25","moon_free_dark_hours":2.0,"moon_illumination":77,"moon_separation":8.8,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":72.6,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.67,"best_label":"marginal","best_window":"19:05\u201300:45","dark_hours":10.95,"date":"2048-01-26","moon_free_dark_hours":1.13,"moon_illumination":84,"moon_separation":20.7,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":72.6,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.0,"best_label":"marginal","best_window":"19:10\u201322:10","dark_hours":10.92,"date":"2048-01-27","moon_free_dark_hours":0.37,"moon_illumination":91,"moon_separation":32.8,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":72.6,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.25,"best_label":"marginal","best_window":"19:10\u201300:25","dark_hours":10.89,"date":"2048-01-28","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":45.1,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":72.6,"transit_local":"19:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.42,"best_label":"marginal","best_window":"19:10\u201300:35","dark_hours":10.86,"date":"2048-01-29","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":57.6,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":72.6,"transit_local":"19:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.42,"best_label":"good","best_window":"19:10\u201320:35","dark_hours":10.83,"date":"2048-01-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":70.4,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":72.6,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.33,"best_label":"good","best_window":"19:15\u201322:35","dark_hours":10.8,"date":"2048-01-31","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":83.5,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":72.6,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.67,"best_label":"good","best_window":"19:15\u201323:55","dark_hours":10.77,"date":"2048-02-01","moon_free_dark_hours":0.35,"moon_illumination":96,"moon_separation":96.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.0,"best_label":"good","best_window":"19:15\u201300:15","dark_hours":10.74,"date":"2048-02-02","moon_free_dark_hours":1.45,"moon_illumination":90,"moon_separation":110.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.08,"best_label":"good","best_window":"19:15\u201300:20","dark_hours":10.7,"date":"2048-02-03","moon_free_dark_hours":2.58,"moon_illumination":83,"moon_separation":123.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":72.6,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Mon"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2048-01-05","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"}}