{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.25,"best_label":"good","best_window":"03:25\u201303:40","dark_hours":4.42,"date":"2027-06-22","moon_free_dark_hours":0.28,"moon_illumination":87,"moon_separation":76.5,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":89.7,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.33,"best_label":"marginal","best_window":"01:20\u201303:40","dark_hours":4.43,"date":"2027-06-23","moon_free_dark_hours":0.67,"moon_illumination":80,"moon_separation":66.3,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":89.6,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.42,"best_label":"marginal","best_window":"01:15\u201303:40","dark_hours":4.43,"date":"2027-06-24","moon_free_dark_hours":1.02,"moon_illumination":72,"moon_separation":56.2,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":89.5,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"03:35\u201303:40","dark_hours":4.44,"date":"2027-06-25","moon_free_dark_hours":1.35,"moon_illumination":62,"moon_separation":46.7,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":89.7,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.5,"best_label":"good","best_window":"02:10\u201303:40","dark_hours":4.45,"date":"2027-06-26","moon_free_dark_hours":1.68,"moon_illumination":53,"moon_separation":38.0,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":89.7,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.67,"best_label":"good","best_window":"02:00\u201303:40","dark_hours":4.46,"date":"2027-06-27","moon_free_dark_hours":2.03,"moon_illumination":43,"moon_separation":31.3,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":89.7,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.83,"best_label":"good","best_window":"01:50\u201303:40","dark_hours":4.48,"date":"2027-06-28","moon_free_dark_hours":2.45,"moon_illumination":32,"moon_separation":28.3,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":89.5,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.17,"best_label":"good","best_window":"01:30\u201303:40","dark_hours":4.49,"date":"2027-06-29","moon_free_dark_hours":2.97,"moon_illumination":23,"moon_separation":30.7,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":89.6,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.33,"best_label":"good","best_window":"01:25\u201303:45","dark_hours":4.51,"date":"2027-06-30","moon_free_dark_hours":3.62,"moon_illumination":14,"moon_separation":37.9,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":89.7,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.42,"best_label":"good","best_window":"01:20\u201303:45","dark_hours":4.53,"date":"2027-07-01","moon_free_dark_hours":4.43,"moon_illumination":7,"moon_separation":48.1,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":89.7,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.42,"best_label":"good","best_window":"01:20\u201303:45","dark_hours":4.55,"date":"2027-07-02","moon_free_dark_hours":4.53,"moon_illumination":2,"moon_separation":59.9,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":89.6,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.5,"best_label":"good","best_window":"01:15\u201303:45","dark_hours":4.58,"date":"2027-07-03","moon_free_dark_hours":4.55,"moon_illumination":0,"moon_separation":72.8,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":89.5,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.58,"best_label":"good","best_window":"01:10\u201303:45","dark_hours":4.6,"date":"2027-07-04","moon_free_dark_hours":4.58,"moon_illumination":1,"moon_separation":86.0,"score":null,"score_astronomy":70,"score_weather":null,"transit_alt":89.6,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.67,"best_label":"good","best_window":"01:05\u201303:45","dark_hours":4.63,"date":"2027-07-05","moon_free_dark_hours":4.62,"moon_illumination":5,"moon_separation":99.4,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":89.7,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"01:00\u201303:50","dark_hours":4.66,"date":"2027-07-06","moon_free_dark_hours":4.63,"moon_illumination":11,"moon_separation":112.4,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":89.7,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"01:00\u201303:50","dark_hours":4.69,"date":"2027-07-07","moon_free_dark_hours":4.6,"moon_illumination":20,"moon_separation":124.7,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":89.6,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"00:55\u201303:50","dark_hours":4.72,"date":"2027-07-08","moon_free_dark_hours":4.2,"moon_illumination":30,"moon_separation":135.9,"score":null,"score_astronomy":79,"score_weather":null,"transit_alt":89.5,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.0,"best_label":"good","best_window":"00:50\u201303:50","dark_hours":4.76,"date":"2027-07-09","moon_free_dark_hours":3.85,"moon_illumination":41,"moon_separation":145.0,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":89.7,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.17,"best_label":"good","best_window":"00:45\u201303:55","dark_hours":4.79,"date":"2027-07-10","moon_free_dark_hours":3.47,"moon_illumination":52,"moon_separation":150.7,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":89.7,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.17,"best_label":"good","best_window":"00:45\u201303:55","dark_hours":4.83,"date":"2027-07-11","moon_free_dark_hours":3.05,"moon_illumination":62,"moon_separation":151.4,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":89.7,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.17,"best_label":"good","best_window":"00:45\u201303:55","dark_hours":4.87,"date":"2027-07-12","moon_free_dark_hours":2.57,"moon_illumination":72,"moon_separation":147.0,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":89.5,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.25,"best_label":"good","best_window":"00:40\u201303:55","dark_hours":4.9,"date":"2027-07-13","moon_free_dark_hours":2.0,"moon_illumination":80,"moon_separation":139.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":89.6,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.33,"best_label":"good","best_window":"00:40\u201304:00","dark_hours":4.95,"date":"2027-07-14","moon_free_dark_hours":1.32,"moon_illumination":88,"moon_separation":130.5,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":89.7,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.42,"best_label":"good","best_window":"00:35\u201304:00","dark_hours":4.99,"date":"2027-07-15","moon_free_dark_hours":0.5,"moon_illumination":93,"moon_separation":120.6,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":89.7,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.33,"best_label":"good","best_window":"00:40\u201304:00","dark_hours":5.03,"date":"2027-07-16","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":110.4,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":89.6,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.25,"best_label":"good","best_window":"00:45\u201304:00","dark_hours":5.07,"date":"2027-07-17","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":100.0,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":89.5,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"01:05\u201304:05","dark_hours":5.12,"date":"2027-07-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":89.6,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":89.6,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.92,"best_label":"good","best_window":"02:10\u201304:05","dark_hours":5.17,"date":"2027-07-19","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":79.2,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":89.7,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"03:20\u201304:05","dark_hours":5.21,"date":"2027-07-20","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":68.9,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":89.7,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.5,"best_label":"marginal","best_window":"23:40\u201304:10","dark_hours":5.26,"date":"2027-07-21","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":58.7,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":89.6,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Wed"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2027-06-22","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}}