{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":4.25,"best_label":"good","best_window":"23:55\u201304:10","dark_hours":5.35,"date":"2028-07-22","moon_free_dark_hours":5.33,"moon_illumination":1,"moon_separation":102.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.33,"best_label":"good","best_window":"23:50\u201304:10","dark_hours":5.4,"date":"2028-07-23","moon_free_dark_hours":5.38,"moon_illumination":5,"moon_separation":115.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.42,"best_label":"good","best_window":"23:50\u201304:15","dark_hours":5.45,"date":"2028-07-24","moon_free_dark_hours":5.43,"moon_illumination":11,"moon_separation":127.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.5,"best_label":"good","best_window":"23:45\u201304:15","dark_hours":5.5,"date":"2028-07-25","moon_free_dark_hours":5.48,"moon_illumination":20,"moon_separation":138.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.58,"best_label":"good","best_window":"23:40\u201304:15","dark_hours":5.55,"date":"2028-07-26","moon_free_dark_hours":5.38,"moon_illumination":30,"moon_separation":147.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.75,"best_label":"good","best_window":"23:35\u201304:20","dark_hours":5.6,"date":"2028-07-27","moon_free_dark_hours":4.93,"moon_illumination":41,"moon_separation":151.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.75,"best_label":"good","best_window":"23:35\u201304:20","dark_hours":5.66,"date":"2028-07-28","moon_free_dark_hours":4.43,"moon_illumination":52,"moon_separation":149.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.75,"best_label":"good","best_window":"23:35\u201304:20","dark_hours":5.71,"date":"2028-07-29","moon_free_dark_hours":3.85,"moon_illumination":63,"moon_separation":143.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.92,"best_label":"good","best_window":"23:30\u201304:25","dark_hours":5.77,"date":"2028-07-30","moon_free_dark_hours":3.13,"moon_illumination":73,"moon_separation":134.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.92,"best_label":"good","best_window":"23:30\u201304:25","dark_hours":5.82,"date":"2028-07-31","moon_free_dark_hours":2.32,"moon_illumination":82,"moon_separation":123.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.92,"best_label":"good","best_window":"23:30\u201304:25","dark_hours":5.88,"date":"2028-08-01","moon_free_dark_hours":1.37,"moon_illumination":89,"moon_separation":112.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.92,"best_label":"good","best_window":"23:35\u201304:30","dark_hours":5.93,"date":"2028-08-02","moon_free_dark_hours":0.37,"moon_illumination":94,"moon_separation":102.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"05:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.67,"best_label":"good","best_window":"23:50\u201304:30","dark_hours":5.99,"date":"2028-08-03","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":91.1,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":89.5,"transit_local":"05:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.42,"best_label":"good","best_window":"01:05\u201304:30","dark_hours":6.04,"date":"2028-08-04","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":80.3,"score":null,"score_astronomy":70,"score_weather":null,"transit_alt":89.6,"transit_local":"05:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.67,"best_label":"good","best_window":"02:55\u201304:35","dark_hours":6.1,"date":"2028-08-05","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":69.8,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":89.7,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.0,"best_label":"marginal","best_window":"22:35\u201304:35","dark_hours":6.16,"date":"2028-08-06","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":59.6,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":89.7,"transit_local":"05:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.0,"best_label":"marginal","best_window":"22:35\u201304:35","dark_hours":6.21,"date":"2028-08-07","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":49.9,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":89.5,"transit_local":"04:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.08,"best_label":"marginal","best_window":"22:30\u201304:35","dark_hours":6.27,"date":"2028-08-08","moon_free_dark_hours":0.0,"moon_illumination":88,"moon_separation":41.1,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":89.5,"transit_local":"04:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.33,"best_label":"marginal","best_window":"22:20\u201304:40","dark_hours":6.33,"date":"2028-08-09","moon_free_dark_hours":0.0,"moon_illumination":82,"moon_separation":33.7,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":89.7,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.42,"best_label":"marginal","best_window":"22:15\u201304:40","dark_hours":6.38,"date":"2028-08-10","moon_free_dark_hours":0.15,"moon_illumination":74,"moon_separation":29.1,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":89.7,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"good","best_window":"22:40\u201322:50","dark_hours":6.44,"date":"2028-08-11","moon_free_dark_hours":0.58,"moon_illumination":65,"moon_separation":28.5,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":89.6,"transit_local":"04:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.17,"best_label":"good","best_window":"22:35\u201304:45","dark_hours":6.5,"date":"2028-08-12","moon_free_dark_hours":1.12,"moon_illumination":56,"moon_separation":32.4,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":89.5,"transit_local":"04:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.25,"best_label":"good","best_window":"22:30\u201304:45","dark_hours":6.56,"date":"2028-08-13","moon_free_dark_hours":1.75,"moon_illumination":46,"moon_separation":39.6,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":89.6,"transit_local":"04:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.33,"best_label":"good","best_window":"22:25\u201304:45","dark_hours":6.61,"date":"2028-08-14","moon_free_dark_hours":2.53,"moon_illumination":35,"moon_separation":49.0,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":89.7,"transit_local":"04:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"good","best_window":"22:20\u201304:50","dark_hours":6.67,"date":"2028-08-15","moon_free_dark_hours":3.48,"moon_illumination":26,"moon_separation":59.8,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":89.7,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.5,"best_label":"good","best_window":"22:20\u201304:50","dark_hours":6.73,"date":"2028-08-16","moon_free_dark_hours":4.6,"moon_illumination":16,"moon_separation":71.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"04:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.58,"best_label":"good","best_window":"22:15\u201304:50","dark_hours":6.79,"date":"2028-08-17","moon_free_dark_hours":5.83,"moon_illumination":9,"moon_separation":83.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"04:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.75,"best_label":"good","best_window":"22:10\u201304:55","dark_hours":6.84,"date":"2028-08-18","moon_free_dark_hours":6.83,"moon_illumination":3,"moon_separation":96.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"04:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.83,"best_label":"good","best_window":"22:05\u201304:55","dark_hours":6.9,"date":"2028-08-19","moon_free_dark_hours":6.88,"moon_illumination":0,"moon_separation":109.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"04:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.92,"best_label":"good","best_window":"22:00\u201304:55","dark_hours":6.96,"date":"2028-08-20","moon_free_dark_hours":6.95,"moon_illumination":0,"moon_separation":122.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"04:05","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2028-07-22","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}}