{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":9.83,"best_label":"good","best_window":"18:55\u201304:45","dark_hours":10.37,"date":"2041-10-28","moon_free_dark_hours":10.13,"moon_illumination":15,"moon_separation":122.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"22:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.75,"best_label":"good","best_window":"18:55\u201304:40","dark_hours":10.4,"date":"2041-10-29","moon_free_dark_hours":9.33,"moon_illumination":23,"moon_separation":112.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"22:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":9.67,"best_label":"good","best_window":"18:55\u201304:35","dark_hours":10.44,"date":"2041-10-30","moon_free_dark_hours":8.33,"moon_illumination":33,"moon_separation":101.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"22:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":9.67,"best_label":"good","best_window":"18:55\u201304:35","dark_hours":10.48,"date":"2041-10-31","moon_free_dark_hours":7.18,"moon_illumination":44,"moon_separation":90.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"22:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":9.67,"best_label":"good","best_window":"18:50\u201304:30","dark_hours":10.51,"date":"2041-11-01","moon_free_dark_hours":5.95,"moon_illumination":55,"moon_separation":78.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"22:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":9.58,"best_label":"good","best_window":"18:50\u201304:25","dark_hours":10.55,"date":"2041-11-02","moon_free_dark_hours":4.67,"moon_illumination":66,"moon_separation":67.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"22:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":9.5,"best_label":"good","best_window":"18:50\u201304:20","dark_hours":10.59,"date":"2041-11-03","moon_free_dark_hours":3.4,"moon_illumination":76,"moon_separation":56.0,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":89.5,"transit_local":"22:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.0,"best_label":"good","best_window":"03:15\u201304:15","dark_hours":10.62,"date":"2041-11-04","moon_free_dark_hours":2.15,"moon_illumination":86,"moon_separation":45.9,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":89.6,"transit_local":"22:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.92,"best_label":"marginal","best_window":"18:50\u201304:45","dark_hours":10.66,"date":"2041-11-05","moon_free_dark_hours":0.9,"moon_illumination":93,"moon_separation":38.1,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":89.8,"transit_local":"22:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":9.42,"best_label":"marginal","best_window":"18:45\u201304:10","dark_hours":10.69,"date":"2041-11-06","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":34.1,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":89.8,"transit_local":"22:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.58,"best_label":"marginal","best_window":"18:45\u201322:20","dark_hours":10.72,"date":"2041-11-07","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":35.5,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":89.7,"transit_local":"21:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.25,"best_label":"marginal","best_window":"18:45\u201301:00","dark_hours":10.76,"date":"2041-11-08","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":41.3,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":89.5,"transit_local":"21:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.75,"best_label":"good","best_window":"18:45\u201319:30","dark_hours":10.79,"date":"2041-11-09","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":49.9,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":89.7,"transit_local":"21:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.92,"best_label":"good","best_window":"18:45\u201321:40","dark_hours":10.82,"date":"2041-11-10","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":59.8,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":89.8,"transit_local":"21:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.08,"best_label":"good","best_window":"18:40\u201300:45","dark_hours":10.85,"date":"2041-11-11","moon_free_dark_hours":0.87,"moon_illumination":84,"moon_separation":70.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"21:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.58,"best_label":"good","best_window":"18:40\u201302:15","dark_hours":10.88,"date":"2041-11-12","moon_free_dark_hours":1.85,"moon_illumination":76,"moon_separation":80.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"21:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":8.58,"best_label":"good","best_window":"18:40\u201303:15","dark_hours":10.91,"date":"2041-11-13","moon_free_dark_hours":2.93,"moon_illumination":67,"moon_separation":90.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"21:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":8.67,"best_label":"good","best_window":"18:40\u201303:20","dark_hours":10.94,"date":"2041-11-14","moon_free_dark_hours":4.02,"moon_illumination":57,"moon_separation":101.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"21:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":8.75,"best_label":"good","best_window":"18:40\u201303:25","dark_hours":10.97,"date":"2041-11-15","moon_free_dark_hours":5.1,"moon_illumination":48,"moon_separation":110.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"21:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":8.75,"best_label":"good","best_window":"18:40\u201303:25","dark_hours":11.0,"date":"2041-11-16","moon_free_dark_hours":6.13,"moon_illumination":38,"moon_separation":120.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":8.75,"best_label":"good","best_window":"18:40\u201303:25","dark_hours":11.03,"date":"2041-11-17","moon_free_dark_hours":7.15,"moon_illumination":29,"moon_separation":128.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"21:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":8.75,"best_label":"good","best_window":"18:35\u201303:20","dark_hours":11.05,"date":"2041-11-18","moon_free_dark_hours":8.18,"moon_illumination":21,"moon_separation":136.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"21:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":8.75,"best_label":"good","best_window":"18:35\u201303:20","dark_hours":11.08,"date":"2041-11-19","moon_free_dark_hours":9.2,"moon_illumination":14,"moon_separation":142.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"21:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":8.67,"best_label":"good","best_window":"18:35\u201303:15","dark_hours":11.1,"date":"2041-11-20","moon_free_dark_hours":10.27,"moon_illumination":8,"moon_separation":145.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":8.58,"best_label":"good","best_window":"18:35\u201303:10","dark_hours":11.13,"date":"2041-11-21","moon_free_dark_hours":11.12,"moon_illumination":3,"moon_separation":145.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":8.5,"best_label":"good","best_window":"18:35\u201303:05","dark_hours":11.15,"date":"2041-11-22","moon_free_dark_hours":11.15,"moon_illumination":1,"moon_separation":141.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":8.5,"best_label":"good","best_window":"18:35\u201303:05","dark_hours":11.18,"date":"2041-11-23","moon_free_dark_hours":11.17,"moon_illumination":0,"moon_separation":134.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"20:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":8.42,"best_label":"good","best_window":"18:35\u201303:00","dark_hours":11.2,"date":"2041-11-24","moon_free_dark_hours":11.18,"moon_illumination":2,"moon_separation":125.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":8.33,"best_label":"good","best_window":"18:35\u201302:55","dark_hours":11.22,"date":"2041-11-25","moon_free_dark_hours":11.22,"moon_illumination":6,"moon_separation":114.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":8.25,"best_label":"good","best_window":"18:35\u201302:50","dark_hours":11.24,"date":"2041-11-26","moon_free_dark_hours":10.92,"moon_illumination":12,"moon_separation":103.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"20:40","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":"2041-10-28","target":{"common_name":"Andromeda Galaxy","dec":41.26875,"morphology":"SA(s)b","name":"M 31","ra":10.68470833,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M31","source":"sesame","type":"AGN","type_text":"galaxy with an active nucleus","vmag":3.44}}