{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.25,"best_label":"good","best_window":"01:30\u201303:45","dark_hours":4.56,"date":"2031-07-02","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":124.0,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":89.6,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.25,"best_label":"good","best_window":"01:30\u201303:45","dark_hours":4.58,"date":"2031-07-03","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":111.7,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":89.5,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.08,"best_label":"good","best_window":"01:40\u201303:45","dark_hours":4.6,"date":"2031-07-04","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":98.7,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":89.6,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.25,"best_label":"good","best_window":"02:30\u201303:45","dark_hours":4.63,"date":"2031-07-05","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":85.7,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":89.7,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"good","best_window":"03:45\u201303:50","dark_hours":4.66,"date":"2031-07-06","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":72.8,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":89.7,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.25,"best_label":"marginal","best_window":"00:35\u201303:50","dark_hours":4.69,"date":"2031-07-07","moon_free_dark_hours":0.0,"moon_illumination":86,"moon_separation":60.6,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":89.6,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.42,"best_label":"marginal","best_window":"00:25\u201303:50","dark_hours":4.72,"date":"2031-07-08","moon_free_dark_hours":0.2,"moon_illumination":77,"moon_separation":49.4,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":89.5,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.5,"best_label":"marginal","best_window":"00:20\u201303:50","dark_hours":4.76,"date":"2031-07-09","moon_free_dark_hours":0.73,"moon_illumination":66,"moon_separation":40.0,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":89.7,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.33,"best_label":"good","best_window":"01:35\u201303:55","dark_hours":4.79,"date":"2031-07-10","moon_free_dark_hours":1.27,"moon_illumination":56,"moon_separation":33.3,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":89.7,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"01:05\u201303:55","dark_hours":4.83,"date":"2031-07-11","moon_free_dark_hours":1.82,"moon_illumination":45,"moon_separation":30.8,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":89.7,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.25,"best_label":"good","best_window":"00:40\u201303:55","dark_hours":4.87,"date":"2031-07-12","moon_free_dark_hours":2.38,"moon_illumination":36,"moon_separation":32.9,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":89.5,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.33,"best_label":"good","best_window":"00:35\u201303:55","dark_hours":4.91,"date":"2031-07-13","moon_free_dark_hours":3.02,"moon_illumination":26,"moon_separation":38.6,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":89.6,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.5,"best_label":"good","best_window":"00:30\u201304:00","dark_hours":4.95,"date":"2031-07-14","moon_free_dark_hours":3.72,"moon_illumination":18,"moon_separation":46.4,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":89.7,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.58,"best_label":"good","best_window":"00:25\u201304:00","dark_hours":4.99,"date":"2031-07-15","moon_free_dark_hours":4.48,"moon_illumination":12,"moon_separation":55.4,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":89.7,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.58,"best_label":"good","best_window":"00:25\u201304:00","dark_hours":5.03,"date":"2031-07-16","moon_free_dark_hours":5.02,"moon_illumination":6,"moon_separation":65.0,"score":null,"score_astronomy":99,"score_weather":null,"transit_alt":89.6,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.67,"best_label":"good","best_window":"00:20\u201304:00","dark_hours":5.08,"date":"2031-07-17","moon_free_dark_hours":5.05,"moon_illumination":2,"moon_separation":74.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.83,"best_label":"good","best_window":"00:15\u201304:05","dark_hours":5.12,"date":"2031-07-18","moon_free_dark_hours":5.12,"moon_illumination":0,"moon_separation":85.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.92,"best_label":"good","best_window":"00:10\u201304:05","dark_hours":5.17,"date":"2031-07-19","moon_free_dark_hours":5.15,"moon_illumination":0,"moon_separation":95.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.0,"best_label":"good","best_window":"00:05\u201304:05","dark_hours":5.21,"date":"2031-07-20","moon_free_dark_hours":5.2,"moon_illumination":2,"moon_separation":105.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.08,"best_label":"good","best_window":"00:05\u201304:10","dark_hours":5.26,"date":"2031-07-21","moon_free_dark_hours":5.25,"moon_illumination":5,"moon_separation":115.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.17,"best_label":"good","best_window":"00:00\u201304:10","dark_hours":5.31,"date":"2031-07-22","moon_free_dark_hours":5.3,"moon_illumination":10,"moon_separation":125.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.25,"best_label":"good","best_window":"23:55\u201304:10","dark_hours":5.36,"date":"2031-07-23","moon_free_dark_hours":5.35,"moon_illumination":17,"moon_separation":134.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.42,"best_label":"good","best_window":"23:50\u201304:15","dark_hours":5.41,"date":"2031-07-24","moon_free_dark_hours":5.38,"moon_illumination":25,"moon_separation":142.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.5,"best_label":"good","best_window":"23:45\u201304:15","dark_hours":5.46,"date":"2031-07-25","moon_free_dark_hours":4.92,"moon_illumination":34,"moon_separation":147.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.5,"best_label":"good","best_window":"23:45\u201304:15","dark_hours":5.51,"date":"2031-07-26","moon_free_dark_hours":4.42,"moon_illumination":45,"moon_separation":149.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.5,"best_label":"good","best_window":"23:45\u201304:15","dark_hours":5.57,"date":"2031-07-27","moon_free_dark_hours":3.83,"moon_illumination":55,"moon_separation":145.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.67,"best_label":"good","best_window":"23:40\u201304:20","dark_hours":5.62,"date":"2031-07-28","moon_free_dark_hours":3.17,"moon_illumination":66,"moon_separation":138.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.67,"best_label":"good","best_window":"23:40\u201304:20","dark_hours":5.67,"date":"2031-07-29","moon_free_dark_hours":2.33,"moon_illumination":77,"moon_separation":128.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.67,"best_label":"good","best_window":"23:40\u201304:20","dark_hours":5.73,"date":"2031-07-30","moon_free_dark_hours":1.37,"moon_illumination":86,"moon_separation":116.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.67,"best_label":"good","best_window":"23:45\u201304:25","dark_hours":5.78,"date":"2031-07-31","moon_free_dark_hours":0.27,"moon_illumination":93,"moon_separation":104.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Thu"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2031-07-02","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}}