{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":8.5,"best_label":"good","best_window":"18:35\u201303:05","dark_hours":11.16,"date":"2039-11-23","moon_free_dark_hours":5.1,"moon_illumination":61,"moon_separation":56.5,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":89.8,"transit_local":"20:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":8.42,"best_label":"good","best_window":"18:35\u201303:00","dark_hours":11.19,"date":"2039-11-24","moon_free_dark_hours":4.0,"moon_illumination":71,"moon_separation":48.1,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":89.6,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"02:50\u201302:55","dark_hours":11.21,"date":"2039-11-25","moon_free_dark_hours":2.95,"moon_illumination":80,"moon_separation":41.6,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":89.5,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":8.67,"best_label":"marginal","best_window":"18:35\u201303:15","dark_hours":11.23,"date":"2039-11-26","moon_free_dark_hours":1.92,"moon_illumination":87,"moon_separation":37.8,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":89.7,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":8.33,"best_label":"marginal","best_window":"18:35\u201302:55","dark_hours":11.25,"date":"2039-11-27","moon_free_dark_hours":0.9,"moon_illumination":93,"moon_separation":37.2,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":89.8,"transit_local":"20:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.92,"best_label":"marginal","best_window":"18:35\u201302:30","dark_hours":11.27,"date":"2039-11-28","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":40.0,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":89.7,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.67,"best_label":"marginal","best_window":"18:35\u201302:15","dark_hours":11.29,"date":"2039-11-29","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":45.4,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":89.6,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.67,"best_label":"marginal","best_window":"18:35\u201302:15","dark_hours":11.31,"date":"2039-11-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":52.6,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":89.6,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.25,"best_label":"good","best_window":"18:35\u201319:50","dark_hours":11.33,"date":"2039-12-01","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":60.8,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":89.7,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.33,"best_label":"good","best_window":"18:35\u201321:55","dark_hours":11.35,"date":"2039-12-02","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":69.6,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":89.8,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.25,"best_label":"good","best_window":"18:35\u201323:50","dark_hours":11.36,"date":"2039-12-03","moon_free_dark_hours":0.47,"moon_illumination":91,"moon_separation":78.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.5,"best_label":"good","best_window":"18:35\u201301:05","dark_hours":11.38,"date":"2039-12-04","moon_free_dark_hours":1.38,"moon_illumination":85,"moon_separation":88.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.25,"best_label":"good","best_window":"18:35\u201301:50","dark_hours":11.39,"date":"2039-12-05","moon_free_dark_hours":2.35,"moon_illumination":77,"moon_separation":97.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.33,"best_label":"good","best_window":"18:35\u201301:55","dark_hours":11.41,"date":"2039-12-06","moon_free_dark_hours":3.38,"moon_illumination":69,"moon_separation":107.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.42,"best_label":"good","best_window":"18:35\u201302:00","dark_hours":11.42,"date":"2039-12-07","moon_free_dark_hours":4.45,"moon_illumination":59,"moon_separation":116.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.42,"best_label":"good","best_window":"18:35\u201302:00","dark_hours":11.43,"date":"2039-12-08","moon_free_dark_hours":5.52,"moon_illumination":49,"moon_separation":125.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.42,"best_label":"good","best_window":"18:35\u201302:00","dark_hours":11.44,"date":"2039-12-09","moon_free_dark_hours":6.62,"moon_illumination":39,"moon_separation":133.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":7.42,"best_label":"good","best_window":"18:35\u201302:00","dark_hours":11.45,"date":"2039-12-10","moon_free_dark_hours":7.77,"moon_illumination":29,"moon_separation":139.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":7.33,"best_label":"good","best_window":"18:35\u201301:55","dark_hours":11.46,"date":"2039-12-11","moon_free_dark_hours":8.95,"moon_illumination":19,"moon_separation":142.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":7.25,"best_label":"good","best_window":"18:35\u201301:50","dark_hours":11.47,"date":"2039-12-12","moon_free_dark_hours":10.22,"moon_illumination":11,"moon_separation":141.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"19:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.17,"best_label":"good","best_window":"18:35\u201301:45","dark_hours":11.48,"date":"2039-12-13","moon_free_dark_hours":11.45,"moon_illumination":5,"moon_separation":135.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"19:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.08,"best_label":"good","best_window":"18:35\u201301:40","dark_hours":11.48,"date":"2039-12-14","moon_free_dark_hours":11.47,"moon_illumination":1,"moon_separation":126.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"19:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":7.08,"best_label":"good","best_window":"18:35\u201301:40","dark_hours":11.49,"date":"2039-12-15","moon_free_dark_hours":11.48,"moon_illumination":0,"moon_separation":116.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":7.0,"best_label":"good","best_window":"18:35\u201301:35","dark_hours":11.5,"date":"2039-12-16","moon_free_dark_hours":11.48,"moon_illumination":2,"moon_separation":104.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.92,"best_label":"good","best_window":"18:35\u201301:30","dark_hours":11.5,"date":"2039-12-17","moon_free_dark_hours":11.38,"moon_illumination":8,"moon_separation":92.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.83,"best_label":"good","best_window":"18:35\u201301:25","dark_hours":11.5,"date":"2039-12-18","moon_free_dark_hours":10.13,"moon_illumination":15,"moon_separation":80.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.75,"best_label":"good","best_window":"18:35\u201301:20","dark_hours":11.51,"date":"2039-12-19","moon_free_dark_hours":8.88,"moon_illumination":24,"moon_separation":69.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.75,"best_label":"good","best_window":"18:35\u201301:20","dark_hours":11.51,"date":"2039-12-20","moon_free_dark_hours":7.67,"moon_illumination":34,"moon_separation":59.1,"score":null,"score_astronomy":96,"score_weather":null,"transit_alt":89.8,"transit_local":"19:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.67,"best_label":"good","best_window":"18:35\u201301:15","dark_hours":11.51,"date":"2039-12-21","moon_free_dark_hours":6.52,"moon_illumination":45,"moon_separation":50.1,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":89.8,"transit_local":"19:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.58,"best_label":"good","best_window":"18:35\u201301:10","dark_hours":11.51,"date":"2039-12-22","moon_free_dark_hours":5.42,"moon_illumination":55,"moon_separation":43.0,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":89.7,"transit_local":"19:00","verdict":"unknown","weather_source":"none","weekday":"Thu"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2039-11-23","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}}