{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":5.08,"best_label":"good","best_window":"00:00\u201305:05","dark_hours":7.24,"date":"2045-08-25","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":76.0,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":89.5,"transit_local":"03:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.0,"best_label":"good","best_window":"03:05\u201305:05","dark_hours":7.3,"date":"2045-08-26","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":65.8,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":89.7,"transit_local":"03:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.33,"best_label":"marginal","best_window":"21:45\u201305:05","dark_hours":7.35,"date":"2045-08-27","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":55.9,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":89.8,"transit_local":"03:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.33,"best_label":"marginal","best_window":"21:45\u201305:05","dark_hours":7.41,"date":"2045-08-28","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":46.5,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":89.8,"transit_local":"03:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.5,"best_label":"marginal","best_window":"21:40\u201305:10","dark_hours":7.47,"date":"2045-08-29","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":38.1,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":89.6,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.5,"best_label":"marginal","best_window":"21:40\u201305:10","dark_hours":7.52,"date":"2045-08-30","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":31.6,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":89.6,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.58,"best_label":"marginal","best_window":"21:35\u201305:10","dark_hours":7.58,"date":"2045-08-31","moon_free_dark_hours":0.0,"moon_illumination":83,"moon_separation":28.6,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":89.7,"transit_local":"03:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.25,"best_label":"good","best_window":"21:35\u201321:50","dark_hours":7.63,"date":"2045-09-01","moon_free_dark_hours":0.22,"moon_illumination":75,"moon_separation":30.3,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":89.8,"transit_local":"03:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.33,"best_label":"good","best_window":"21:35\u201301:55","dark_hours":7.69,"date":"2045-09-02","moon_free_dark_hours":0.77,"moon_illumination":66,"moon_separation":36.3,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":89.7,"transit_local":"03:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.75,"best_label":"good","best_window":"21:30\u201305:15","dark_hours":7.74,"date":"2045-09-03","moon_free_dark_hours":1.45,"moon_illumination":55,"moon_separation":45.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":89.6,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.75,"best_label":"good","best_window":"21:30\u201305:15","dark_hours":7.8,"date":"2045-09-04","moon_free_dark_hours":2.32,"moon_illumination":44,"moon_separation":55.6,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":89.6,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.92,"best_label":"good","best_window":"21:25\u201305:20","dark_hours":7.86,"date":"2045-09-05","moon_free_dark_hours":3.38,"moon_illumination":34,"moon_separation":67.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.92,"best_label":"good","best_window":"21:25\u201305:20","dark_hours":7.91,"date":"2045-09-06","moon_free_dark_hours":4.63,"moon_illumination":23,"moon_separation":79.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"03:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.92,"best_label":"good","best_window":"21:25\u201305:20","dark_hours":7.96,"date":"2045-09-07","moon_free_dark_hours":5.97,"moon_illumination":14,"moon_separation":92.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":8.0,"best_label":"good","best_window":"21:20\u201305:20","dark_hours":8.02,"date":"2045-09-08","moon_free_dark_hours":7.35,"moon_illumination":7,"moon_separation":105.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":8.08,"best_label":"good","best_window":"21:20\u201305:25","dark_hours":8.07,"date":"2045-09-09","moon_free_dark_hours":8.05,"moon_illumination":2,"moon_separation":118.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"02:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":8.17,"best_label":"good","best_window":"21:15\u201305:25","dark_hours":8.13,"date":"2045-09-10","moon_free_dark_hours":8.1,"moon_illumination":0,"moon_separation":130.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":8.17,"best_label":"good","best_window":"21:15\u201305:25","dark_hours":8.18,"date":"2045-09-11","moon_free_dark_hours":8.17,"moon_illumination":1,"moon_separation":141.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"02:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":8.17,"best_label":"good","best_window":"21:15\u201305:25","dark_hours":8.23,"date":"2045-09-12","moon_free_dark_hours":8.22,"moon_illumination":5,"moon_separation":149.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":8.33,"best_label":"good","best_window":"21:10\u201305:30","dark_hours":8.29,"date":"2045-09-13","moon_free_dark_hours":8.27,"moon_illumination":11,"moon_separation":151.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":8.33,"best_label":"good","best_window":"21:10\u201305:30","dark_hours":8.34,"date":"2045-09-14","moon_free_dark_hours":8.32,"moon_illumination":20,"moon_separation":147.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"02:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":8.42,"best_label":"good","best_window":"21:05\u201305:30","dark_hours":8.39,"date":"2045-09-15","moon_free_dark_hours":7.98,"moon_illumination":29,"moon_separation":140.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":8.42,"best_label":"good","best_window":"21:05\u201305:30","dark_hours":8.45,"date":"2045-09-16","moon_free_dark_hours":7.3,"moon_illumination":39,"moon_separation":130.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"02:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":8.5,"best_label":"good","best_window":"21:05\u201305:35","dark_hours":8.5,"date":"2045-09-17","moon_free_dark_hours":6.48,"moon_illumination":49,"moon_separation":120.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"02:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":8.58,"best_label":"good","best_window":"21:00\u201305:35","dark_hours":8.55,"date":"2045-09-18","moon_free_dark_hours":5.55,"moon_illumination":58,"moon_separation":110.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"02:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":8.58,"best_label":"good","best_window":"21:00\u201305:35","dark_hours":8.6,"date":"2045-09-19","moon_free_dark_hours":4.55,"moon_illumination":68,"moon_separation":99.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"02:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":8.67,"best_label":"good","best_window":"20:55\u201305:35","dark_hours":8.65,"date":"2045-09-20","moon_free_dark_hours":3.53,"moon_illumination":76,"moon_separation":89.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"02:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":8.75,"best_label":"good","best_window":"20:55\u201305:40","dark_hours":8.7,"date":"2045-09-21","moon_free_dark_hours":2.48,"moon_illumination":84,"moon_separation":78.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"02:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.08,"best_label":"good","best_window":"22:35\u201305:40","dark_hours":8.75,"date":"2045-09-22","moon_free_dark_hours":1.47,"moon_illumination":90,"moon_separation":68.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"01:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"good","best_window":"02:45\u201305:40","dark_hours":8.81,"date":"2045-09-23","moon_free_dark_hours":0.45,"moon_illumination":95,"moon_separation":58.5,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":89.7,"transit_local":"01:55","verdict":"unknown","weather_source":"none","weekday":"Sat"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2045-08-25","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}}