{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":6.17,"best_label":"good","best_window":"18:40\u201300:50","dark_hours":11.5,"date":"2040-12-25","moon_free_dark_hours":5.0,"moon_illumination":58,"moon_separation":131.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.17,"best_label":"good","best_window":"18:40\u201300:50","dark_hours":11.49,"date":"2040-12-26","moon_free_dark_hours":6.02,"moon_illumination":48,"moon_separation":138.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.17,"best_label":"good","best_window":"18:40\u201300:50","dark_hours":11.49,"date":"2040-12-27","moon_free_dark_hours":7.08,"moon_illumination":38,"moon_separation":143.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"18:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.08,"best_label":"good","best_window":"18:40\u201300:45","dark_hours":11.48,"date":"2040-12-28","moon_free_dark_hours":8.18,"moon_illumination":28,"moon_separation":144.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"18:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.0,"best_label":"good","best_window":"18:40\u201300:40","dark_hours":11.47,"date":"2040-12-29","moon_free_dark_hours":9.35,"moon_illumination":19,"moon_separation":141.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"18:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.92,"best_label":"good","best_window":"18:40\u201300:35","dark_hours":11.47,"date":"2040-12-30","moon_free_dark_hours":10.6,"moon_illumination":11,"moon_separation":135.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.75,"best_label":"good","best_window":"18:45\u201300:30","dark_hours":11.46,"date":"2040-12-31","moon_free_dark_hours":11.45,"moon_illumination":5,"moon_separation":125.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.75,"best_label":"good","best_window":"18:45\u201300:30","dark_hours":11.45,"date":"2041-01-01","moon_free_dark_hours":11.43,"moon_illumination":1,"moon_separation":114.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"18:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.67,"best_label":"good","best_window":"18:45\u201300:25","dark_hours":11.44,"date":"2041-01-02","moon_free_dark_hours":11.42,"moon_illumination":0,"moon_separation":103.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"18:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.58,"best_label":"good","best_window":"18:45\u201300:20","dark_hours":11.42,"date":"2041-01-03","moon_free_dark_hours":11.4,"moon_illumination":2,"moon_separation":90.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.5,"best_label":"good","best_window":"18:45\u201300:15","dark_hours":11.41,"date":"2041-01-04","moon_free_dark_hours":11.23,"moon_illumination":7,"moon_separation":78.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.42,"best_label":"good","best_window":"18:45\u201300:10","dark_hours":11.4,"date":"2041-01-05","moon_free_dark_hours":9.88,"moon_illumination":14,"moon_separation":66.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.33,"best_label":"good","best_window":"18:50\u201300:10","dark_hours":11.38,"date":"2041-01-06","moon_free_dark_hours":8.58,"moon_illumination":24,"moon_separation":55.7,"score":null,"score_astronomy":94,"score_weather":null,"transit_alt":89.8,"transit_local":"18:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.25,"best_label":"good","best_window":"18:50\u201300:05","dark_hours":11.37,"date":"2041-01-07","moon_free_dark_hours":7.33,"moon_illumination":34,"moon_separation":46.3,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":89.8,"transit_local":"17:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.83,"best_label":"good","best_window":"18:50\u201323:40","dark_hours":11.35,"date":"2041-01-08","moon_free_dark_hours":6.15,"moon_illumination":45,"moon_separation":39.3,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":89.6,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.25,"best_label":"good","best_window":"18:50\u201322:05","dark_hours":11.34,"date":"2041-01-09","moon_free_dark_hours":5.0,"moon_illumination":56,"moon_separation":35.7,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":89.5,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.42,"best_label":"marginal","best_window":"18:50\u201300:15","dark_hours":11.32,"date":"2041-01-10","moon_free_dark_hours":3.87,"moon_illumination":66,"moon_separation":36.2,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":89.7,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.08,"best_label":"marginal","best_window":"18:55\u201300:00","dark_hours":11.3,"date":"2041-01-11","moon_free_dark_hours":2.75,"moon_illumination":75,"moon_separation":40.5,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":89.8,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.83,"best_label":"marginal","best_window":"18:55\u201323:45","dark_hours":11.28,"date":"2041-01-12","moon_free_dark_hours":1.63,"moon_illumination":83,"moon_separation":47.3,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":89.7,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.67,"best_label":"marginal","best_window":"18:55\u201323:35","dark_hours":11.26,"date":"2041-01-13","moon_free_dark_hours":0.58,"moon_illumination":90,"moon_separation":55.5,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":89.6,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.67,"best_label":"marginal","best_window":"18:55\u201323:35","dark_hours":11.24,"date":"2041-01-14","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":64.6,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":89.6,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"18:55\u201319:40","dark_hours":11.22,"date":"2041-01-15","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":74.1,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":89.8,"transit_local":"17:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.0,"best_label":"good","best_window":"18:55\u201320:55","dark_hours":11.2,"date":"2041-01-16","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":83.7,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":89.8,"transit_local":"17:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.0,"best_label":"good","best_window":"19:00\u201322:00","dark_hours":11.17,"date":"2041-01-17","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":93.4,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":89.7,"transit_local":"17:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.83,"best_label":"good","best_window":"19:00\u201322:50","dark_hours":11.15,"date":"2041-01-18","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":103.0,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":89.5,"transit_local":"17:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.0,"best_label":"good","best_window":"19:00\u201323:00","dark_hours":11.12,"date":"2041-01-19","moon_free_dark_hours":0.43,"moon_illumination":94,"moon_separation":112.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.7,"transit_local":"17:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.0,"best_label":"good","best_window":"19:00\u201323:00","dark_hours":11.1,"date":"2041-01-20","moon_free_dark_hours":1.45,"moon_illumination":88,"moon_separation":121.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"17:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.92,"best_label":"good","best_window":"19:05\u201323:00","dark_hours":11.07,"date":"2041-01-21","moon_free_dark_hours":2.45,"moon_illumination":82,"moon_separation":129.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.8,"transit_local":"17:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.92,"best_label":"good","best_window":"19:05\u201323:00","dark_hours":11.05,"date":"2041-01-22","moon_free_dark_hours":3.45,"moon_illumination":74,"moon_separation":137.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.6,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.92,"best_label":"good","best_window":"19:05\u201323:00","dark_hours":11.02,"date":"2041-01-23","moon_free_dark_hours":4.47,"moon_illumination":65,"moon_separation":142.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":89.5,"transit_local":"16:55","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":"2040-12-25","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}}
