{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.17,"best_label":"marginal","best_window":"04:05\u201304:15","dark_hours":5.76,"date":"2036-05-11","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":124.5,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":89.6,"transit_local":"10:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:00\u201304:10","dark_hours":5.71,"date":"2036-05-12","moon_free_dark_hours":0.2,"moon_illumination":93,"moon_separation":115.7,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":89.7,"transit_local":"10:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:00\u201304:10","dark_hours":5.65,"date":"2036-05-13","moon_free_dark_hours":1.05,"moon_illumination":87,"moon_separation":106.6,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":89.8,"transit_local":"10:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.25,"best_label":"marginal","best_window":"03:55\u201304:10","dark_hours":5.6,"date":"2036-05-14","moon_free_dark_hours":1.83,"moon_illumination":80,"moon_separation":97.2,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":89.7,"transit_local":"10:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.25,"best_label":"marginal","best_window":"03:50\u201304:05","dark_hours":5.55,"date":"2036-05-15","moon_free_dark_hours":2.53,"moon_illumination":72,"moon_separation":87.8,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":89.5,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.33,"best_label":"marginal","best_window":"03:45\u201304:05","dark_hours":5.49,"date":"2036-05-16","moon_free_dark_hours":3.13,"moon_illumination":63,"moon_separation":78.5,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":89.6,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.33,"best_label":"marginal","best_window":"03:45\u201304:05","dark_hours":5.44,"date":"2036-05-17","moon_free_dark_hours":3.68,"moon_illumination":54,"moon_separation":69.4,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":89.8,"transit_local":"10:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.33,"best_label":"marginal","best_window":"03:40\u201304:00","dark_hours":5.39,"date":"2036-05-18","moon_free_dark_hours":4.18,"moon_illumination":45,"moon_separation":60.6,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":89.7,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.42,"best_label":"marginal","best_window":"03:35\u201304:00","dark_hours":5.34,"date":"2036-05-19","moon_free_dark_hours":4.65,"moon_illumination":35,"moon_separation":52.5,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":89.6,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"marginal","best_window":"03:30\u201304:00","dark_hours":5.29,"date":"2036-05-20","moon_free_dark_hours":5.12,"moon_illumination":26,"moon_separation":45.4,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":89.5,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.75,"best_label":"marginal","best_window":"04:00\u201304:45","dark_hours":5.24,"date":"2036-05-21","moon_free_dark_hours":5.22,"moon_illumination":18,"moon_separation":40.2,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":89.7,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.33,"best_label":"marginal","best_window":"03:25\u201304:45","dark_hours":5.19,"date":"2036-05-22","moon_free_dark_hours":5.18,"moon_illumination":10,"moon_separation":38.0,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":89.8,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"03:50\u201303:55","dark_hours":5.15,"date":"2036-05-23","moon_free_dark_hours":5.13,"moon_illumination":5,"moon_separation":39.6,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":89.7,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"good","best_window":"03:50\u201303:55","dark_hours":5.1,"date":"2036-05-24","moon_free_dark_hours":5.08,"moon_illumination":1,"moon_separation":45.0,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":89.6,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"good","best_window":"03:45\u201303:50","dark_hours":5.06,"date":"2036-05-25","moon_free_dark_hours":5.03,"moon_illumination":0,"moon_separation":53.1,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":89.6,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"good","best_window":"03:40\u201303:50","dark_hours":5.01,"date":"2036-05-26","moon_free_dark_hours":5.0,"moon_illumination":2,"moon_separation":63.1,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":89.7,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.25,"best_label":"good","best_window":"03:35\u201303:50","dark_hours":4.97,"date":"2036-05-27","moon_free_dark_hours":4.95,"moon_illumination":6,"moon_separation":74.0,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":89.8,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.33,"best_label":"good","best_window":"03:30\u201303:50","dark_hours":4.93,"date":"2036-05-28","moon_free_dark_hours":4.37,"moon_illumination":13,"moon_separation":85.4,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":89.7,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.33,"best_label":"good","best_window":"03:30\u201303:50","dark_hours":4.89,"date":"2036-05-29","moon_free_dark_hours":3.47,"moon_illumination":22,"moon_separation":96.9,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":89.5,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.33,"best_label":"good","best_window":"03:25\u201303:45","dark_hours":4.85,"date":"2036-05-30","moon_free_dark_hours":2.7,"moon_illumination":33,"moon_separation":108.1,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":89.6,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.42,"best_label":"good","best_window":"03:20\u201303:45","dark_hours":4.81,"date":"2036-05-31","moon_free_dark_hours":2.02,"moon_illumination":44,"moon_separation":118.6,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":89.8,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.5,"best_label":"good","best_window":"03:15\u201303:45","dark_hours":4.78,"date":"2036-06-01","moon_free_dark_hours":1.42,"moon_illumination":55,"moon_separation":128.0,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":89.8,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.5,"best_label":"good","best_window":"03:15\u201303:45","dark_hours":4.74,"date":"2036-06-02","moon_free_dark_hours":0.85,"moon_illumination":66,"moon_separation":135.6,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":89.6,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"good","best_window":"03:15\u201303:45","dark_hours":4.71,"date":"2036-06-03","moon_free_dark_hours":0.32,"moon_illumination":76,"moon_separation":140.5,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":89.5,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.42,"best_label":"good","best_window":"03:15\u201303:40","dark_hours":4.68,"date":"2036-06-04","moon_free_dark_hours":0.0,"moon_illumination":84,"moon_separation":141.9,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":89.7,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.5,"best_label":"good","best_window":"03:10\u201303:40","dark_hours":4.65,"date":"2036-06-05","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":139.6,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":89.8,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.5,"best_label":"good","best_window":"03:10\u201303:40","dark_hours":4.62,"date":"2036-06-06","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":134.2,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":89.7,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.58,"best_label":"good","best_window":"03:05\u201303:40","dark_hours":4.59,"date":"2036-06-07","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":126.9,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":89.6,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.67,"best_label":"good","best_window":"03:00\u201303:40","dark_hours":4.57,"date":"2036-06-08","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":118.5,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":89.6,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.58,"best_label":"good","best_window":"03:05\u201303:40","dark_hours":4.54,"date":"2036-06-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":109.5,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":89.7,"transit_local":"08:50","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":"2036-05-11","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}}