{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":9.0,"best_label":"good","best_window":"20:45\u201305:45","dark_hours":8.98,"date":"2043-09-27","moon_free_dark_hours":5.15,"moon_illumination":27,"moon_separation":91.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"01:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":9.0,"best_label":"good","best_window":"20:45\u201305:45","dark_hours":9.03,"date":"2043-09-28","moon_free_dark_hours":6.38,"moon_illumination":18,"moon_separation":102.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"01:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.08,"best_label":"good","best_window":"20:40\u201305:45","dark_hours":9.08,"date":"2043-09-29","moon_free_dark_hours":7.6,"moon_illumination":10,"moon_separation":113.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"01:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":9.08,"best_label":"good","best_window":"20:40\u201305:45","dark_hours":9.13,"date":"2043-09-30","moon_free_dark_hours":8.77,"moon_illumination":5,"moon_separation":124.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"01:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":9.17,"best_label":"good","best_window":"20:40\u201305:50","dark_hours":9.17,"date":"2043-10-01","moon_free_dark_hours":9.17,"moon_illumination":2,"moon_separation":134.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"01:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":9.25,"best_label":"good","best_window":"20:35\u201305:50","dark_hours":9.22,"date":"2043-10-02","moon_free_dark_hours":9.22,"moon_illumination":0,"moon_separation":142.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"01:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":9.25,"best_label":"good","best_window":"20:35\u201305:50","dark_hours":9.27,"date":"2043-10-03","moon_free_dark_hours":9.25,"moon_illumination":1,"moon_separation":147.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"01:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":9.25,"best_label":"good","best_window":"20:35\u201305:50","dark_hours":9.32,"date":"2043-10-04","moon_free_dark_hours":9.3,"moon_illumination":3,"moon_separation":149.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":9.42,"best_label":"good","best_window":"20:30\u201305:55","dark_hours":9.36,"date":"2043-10-05","moon_free_dark_hours":9.35,"moon_illumination":7,"moon_separation":146.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"01:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.42,"best_label":"good","best_window":"20:30\u201305:55","dark_hours":9.41,"date":"2043-10-06","moon_free_dark_hours":9.38,"moon_illumination":13,"moon_separation":141.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"01:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":9.42,"best_label":"good","best_window":"20:30\u201305:55","dark_hours":9.46,"date":"2043-10-07","moon_free_dark_hours":9.25,"moon_illumination":20,"moon_separation":133.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"01:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":9.5,"best_label":"good","best_window":"20:25\u201305:55","dark_hours":9.5,"date":"2043-10-08","moon_free_dark_hours":8.63,"moon_illumination":28,"moon_separation":124.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"00:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":9.5,"best_label":"good","best_window":"20:25\u201305:55","dark_hours":9.55,"date":"2043-10-09","moon_free_dark_hours":7.85,"moon_illumination":37,"moon_separation":115.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"00:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":9.58,"best_label":"good","best_window":"20:25\u201306:00","dark_hours":9.59,"date":"2043-10-10","moon_free_dark_hours":6.95,"moon_illumination":46,"moon_separation":104.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"00:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":9.67,"best_label":"good","best_window":"20:20\u201306:00","dark_hours":9.64,"date":"2043-10-11","moon_free_dark_hours":5.92,"moon_illumination":56,"moon_separation":94.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"00:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":9.67,"best_label":"good","best_window":"20:20\u201306:00","dark_hours":9.68,"date":"2043-10-12","moon_free_dark_hours":4.8,"moon_illumination":66,"moon_separation":83.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.67,"best_label":"good","best_window":"20:20\u201306:00","dark_hours":9.73,"date":"2043-10-13","moon_free_dark_hours":3.63,"moon_illumination":75,"moon_separation":72.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":8.83,"best_label":"good","best_window":"21:15\u201306:05","dark_hours":9.77,"date":"2043-10-14","moon_free_dark_hours":2.45,"moon_illumination":84,"moon_separation":61.8,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":89.6,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.33,"best_label":"good","best_window":"02:45\u201306:05","dark_hours":9.82,"date":"2043-10-15","moon_free_dark_hours":1.27,"moon_illumination":91,"moon_separation":51.0,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":89.7,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"06:00\u201306:05","dark_hours":9.86,"date":"2043-10-16","moon_free_dark_hours":0.05,"moon_illumination":96,"moon_separation":41.1,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":89.8,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.92,"best_label":"marginal","best_window":"01:10\u201306:05","dark_hours":9.9,"date":"2043-10-17","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":33.6,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":89.7,"transit_local":"00:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.08,"best_label":"marginal","best_window":"20:10\u201323:15","dark_hours":9.94,"date":"2043-10-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":30.8,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":89.6,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.67,"best_label":"marginal","best_window":"20:10\u201300:50","dark_hours":9.99,"date":"2043-10-19","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":34.2,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":89.6,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":9.75,"best_label":"marginal","best_window":"20:10\u201305:55","dark_hours":10.03,"date":"2043-10-20","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":42.3,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":89.8,"transit_local":"00:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.42,"best_label":"good","best_window":"20:05\u201323:30","dark_hours":10.07,"date":"2043-10-21","moon_free_dark_hours":0.3,"moon_illumination":84,"moon_separation":53.0,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":89.8,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.08,"best_label":"good","best_window":"20:05\u201303:10","dark_hours":10.11,"date":"2043-10-22","moon_free_dark_hours":1.3,"moon_illumination":74,"moon_separation":64.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":8.92,"best_label":"good","best_window":"20:05\u201305:00","dark_hours":10.15,"date":"2043-10-23","moon_free_dark_hours":2.45,"moon_illumination":63,"moon_separation":76.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":9.67,"best_label":"good","best_window":"20:00\u201304:40","dark_hours":10.19,"date":"2043-10-24","moon_free_dark_hours":3.7,"moon_illumination":52,"moon_separation":88.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":9.75,"best_label":"good","best_window":"19:00\u201304:45","dark_hours":10.23,"date":"2043-10-25","moon_free_dark_hours":4.95,"moon_illumination":41,"moon_separation":100.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":9.83,"best_label":"good","best_window":"19:00\u201304:50","dark_hours":10.27,"date":"2043-10-26","moon_free_dark_hours":6.17,"moon_illumination":31,"moon_separation":111.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"22:45","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":"2043-09-27","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}}