{"calculation_version":"2026-10-10.1","days":30,"nights":[{"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"},{"best_hours":4.58,"best_label":"marginal","best_window":"23:35\u201304:10","dark_hours":5.31,"date":"2027-07-22","moon_free_dark_hours":0.0,"moon_illumination":84,"moon_separation":49.0,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":89.5,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.75,"best_label":"marginal","best_window":"23:25\u201304:10","dark_hours":5.36,"date":"2027-07-23","moon_free_dark_hours":0.17,"moon_illumination":77,"moon_separation":40.1,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":89.6,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.92,"best_label":"marginal","best_window":"23:20\u201304:15","dark_hours":5.41,"date":"2027-07-24","moon_free_dark_hours":0.52,"moon_illumination":68,"moon_separation":32.8,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":89.7,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.17,"best_label":"good","best_window":"00:50\u201304:00","dark_hours":5.46,"date":"2027-07-25","moon_free_dark_hours":0.93,"moon_illumination":58,"moon_separation":28.6,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":89.7,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.5,"best_label":"good","best_window":"23:45\u201304:15","dark_hours":5.51,"date":"2027-07-26","moon_free_dark_hours":1.4,"moon_illumination":48,"moon_separation":29.2,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":89.5,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.58,"best_label":"good","best_window":"23:40\u201304:15","dark_hours":5.56,"date":"2027-07-27","moon_free_dark_hours":1.98,"moon_illumination":37,"moon_separation":34.8,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":89.6,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.75,"best_label":"good","best_window":"23:35\u201304:20","dark_hours":5.62,"date":"2027-07-28","moon_free_dark_hours":2.72,"moon_illumination":27,"moon_separation":43.8,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":89.7,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.83,"best_label":"good","best_window":"23:30\u201304:20","dark_hours":5.67,"date":"2027-07-29","moon_free_dark_hours":3.65,"moon_illumination":17,"moon_separation":54.8,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":89.7,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.83,"best_label":"good","best_window":"23:30\u201304:20","dark_hours":5.72,"date":"2027-07-30","moon_free_dark_hours":4.8,"moon_illumination":9,"moon_separation":67.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.0,"best_label":"good","best_window":"23:25\u201304:25","dark_hours":5.78,"date":"2027-07-31","moon_free_dark_hours":5.77,"moon_illumination":3,"moon_separation":80.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.08,"best_label":"good","best_window":"23:20\u201304:25","dark_hours":5.83,"date":"2027-08-01","moon_free_dark_hours":5.82,"moon_illumination":0,"moon_separation":93.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.17,"best_label":"good","best_window":"23:15\u201304:25","dark_hours":5.89,"date":"2027-08-02","moon_free_dark_hours":5.88,"moon_illumination":0,"moon_separation":106.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.33,"best_label":"good","best_window":"23:10\u201304:30","dark_hours":5.94,"date":"2027-08-03","moon_free_dark_hours":5.92,"moon_illumination":4,"moon_separation":119.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.33,"best_label":"good","best_window":"23:10\u201304:30","dark_hours":6.0,"date":"2027-08-04","moon_free_dark_hours":5.98,"moon_illumination":9,"moon_separation":131.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.42,"best_label":"good","best_window":"23:05\u201304:30","dark_hours":6.06,"date":"2027-08-05","moon_free_dark_hours":6.03,"moon_illumination":17,"moon_separation":142.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.58,"best_label":"good","best_window":"23:00\u201304:35","dark_hours":6.11,"date":"2027-08-06","moon_free_dark_hours":6.08,"moon_illumination":26,"moon_separation":149.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.67,"best_label":"good","best_window":"22:55\u201304:35","dark_hours":6.17,"date":"2027-08-07","moon_free_dark_hours":5.7,"moon_illumination":37,"moon_separation":151.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.67,"best_label":"good","best_window":"22:55\u201304:35","dark_hours":6.23,"date":"2027-08-08","moon_free_dark_hours":5.22,"moon_illumination":47,"moon_separation":148.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"04:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.75,"best_label":"good","best_window":"22:55\u201304:40","dark_hours":6.28,"date":"2027-08-09","moon_free_dark_hours":4.7,"moon_illumination":57,"moon_separation":141.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.83,"best_label":"good","best_window":"22:50\u201304:40","dark_hours":6.34,"date":"2027-08-10","moon_free_dark_hours":4.03,"moon_illumination":67,"moon_separation":132.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2027-07-12","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}}