{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.25,"best_label":"good","best_window":"02:25\u201303:40","dark_hours":4.42,"date":"2041-06-20","moon_free_dark_hours":2.5,"moon_illumination":52,"moon_separation":47.0,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":89.6,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.42,"best_label":"good","best_window":"02:15\u201303:40","dark_hours":4.42,"date":"2041-06-21","moon_free_dark_hours":2.88,"moon_illumination":41,"moon_separation":39.4,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":89.6,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"01:55\u201303:40","dark_hours":4.43,"date":"2041-06-22","moon_free_dark_hours":3.28,"moon_illumination":30,"moon_separation":35.2,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":89.7,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.83,"best_label":"good","best_window":"01:50\u201303:40","dark_hours":4.43,"date":"2041-06-23","moon_free_dark_hours":3.7,"moon_illumination":21,"moon_separation":35.3,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":89.8,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.92,"best_label":"good","best_window":"01:45\u201303:40","dark_hours":4.44,"date":"2041-06-24","moon_free_dark_hours":4.18,"moon_illumination":13,"moon_separation":39.7,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":89.7,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.92,"best_label":"good","best_window":"01:45\u201303:40","dark_hours":4.45,"date":"2041-06-25","moon_free_dark_hours":4.43,"moon_illumination":7,"moon_separation":46.9,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":89.5,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.0,"best_label":"good","best_window":"01:40\u201303:40","dark_hours":4.46,"date":"2041-06-26","moon_free_dark_hours":4.43,"moon_illumination":2,"moon_separation":55.6,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":89.6,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.08,"best_label":"good","best_window":"01:35\u201303:40","dark_hours":4.47,"date":"2041-06-27","moon_free_dark_hours":4.45,"moon_illumination":0,"moon_separation":65.2,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":89.8,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.17,"best_label":"good","best_window":"01:30\u201303:40","dark_hours":4.49,"date":"2041-06-28","moon_free_dark_hours":4.48,"moon_illumination":0,"moon_separation":75.1,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":89.8,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.17,"best_label":"good","best_window":"01:30\u201303:40","dark_hours":4.5,"date":"2041-06-29","moon_free_dark_hours":4.48,"moon_illumination":2,"moon_separation":85.2,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":89.6,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.33,"best_label":"good","best_window":"01:25\u201303:45","dark_hours":4.52,"date":"2041-06-30","moon_free_dark_hours":4.5,"moon_illumination":6,"moon_separation":95.1,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":89.5,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.42,"best_label":"good","best_window":"01:20\u201303:45","dark_hours":4.55,"date":"2041-07-01","moon_free_dark_hours":4.35,"moon_illumination":11,"moon_separation":104.9,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":89.7,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"good","best_window":"01:15\u201303:45","dark_hours":4.57,"date":"2041-07-02","moon_free_dark_hours":3.93,"moon_illumination":18,"moon_separation":114.4,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":89.8,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.58,"best_label":"good","best_window":"01:10\u201303:45","dark_hours":4.59,"date":"2041-07-03","moon_free_dark_hours":3.57,"moon_illumination":26,"moon_separation":123.4,"score":null,"score_astronomy":68,"score_weather":null,"transit_alt":89.7,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.58,"best_label":"good","best_window":"01:10\u201303:45","dark_hours":4.62,"date":"2041-07-04","moon_free_dark_hours":3.25,"moon_illumination":34,"moon_separation":131.6,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":89.6,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.75,"best_label":"good","best_window":"01:05\u201303:50","dark_hours":4.65,"date":"2041-07-05","moon_free_dark_hours":2.93,"moon_illumination":44,"moon_separation":138.6,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":89.6,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.75,"best_label":"good","best_window":"01:05\u201303:50","dark_hours":4.68,"date":"2041-07-06","moon_free_dark_hours":2.63,"moon_illumination":53,"moon_separation":143.6,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":89.7,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.83,"best_label":"good","best_window":"01:00\u201303:50","dark_hours":4.71,"date":"2041-07-07","moon_free_dark_hours":2.3,"moon_illumination":63,"moon_separation":145.4,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":89.8,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.83,"best_label":"good","best_window":"01:00\u201303:50","dark_hours":4.74,"date":"2041-07-08","moon_free_dark_hours":1.9,"moon_illumination":73,"moon_separation":143.4,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":89.7,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.92,"best_label":"good","best_window":"00:55\u201303:50","dark_hours":4.78,"date":"2041-07-09","moon_free_dark_hours":1.43,"moon_illumination":82,"moon_separation":137.7,"score":null,"score_astronomy":79,"score_weather":null,"transit_alt":89.5,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.0,"best_label":"good","best_window":"00:55\u201303:55","dark_hours":4.81,"date":"2041-07-10","moon_free_dark_hours":0.85,"moon_illumination":89,"moon_separation":129.4,"score":null,"score_astronomy":82,"score_weather":null,"transit_alt":89.6,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.08,"best_label":"good","best_window":"00:50\u201303:55","dark_hours":4.85,"date":"2041-07-11","moon_free_dark_hours":0.07,"moon_illumination":95,"moon_separation":119.2,"score":null,"score_astronomy":82,"score_weather":null,"transit_alt":89.8,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.0,"best_label":"good","best_window":"00:55\u201303:55","dark_hours":4.89,"date":"2041-07-12","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":107.9,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":89.8,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"good","best_window":"01:00\u201303:55","dark_hours":4.93,"date":"2041-07-13","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":95.9,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":89.7,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"01:35\u201304:00","dark_hours":4.97,"date":"2041-07-14","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":83.7,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":89.5,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.33,"best_label":"good","best_window":"02:40\u201304:00","dark_hours":5.01,"date":"2041-07-15","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":71.5,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":89.7,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"good","best_window":"03:35\u201304:00","dark_hours":5.06,"date":"2041-07-16","moon_free_dark_hours":0.35,"moon_illumination":86,"moon_separation":59.9,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":89.8,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.33,"best_label":"marginal","best_window":"23:45\u201304:05","dark_hours":5.1,"date":"2041-07-17","moon_free_dark_hours":0.82,"moon_illumination":77,"moon_separation":49.4,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":89.8,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.17,"best_label":"good","best_window":"01:55\u201304:05","dark_hours":5.15,"date":"2041-07-18","moon_free_dark_hours":1.23,"moon_illumination":66,"moon_separation":40.8,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":89.6,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.92,"best_label":"good","best_window":"00:10\u201304:05","dark_hours":5.19,"date":"2041-07-19","moon_free_dark_hours":1.67,"moon_illumination":55,"moon_separation":35.6,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":89.6,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Fri"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2041-06-20","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}}