{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.7,"date":"2045-03-20","moon_free_dark_hours":8.23,"moon_illumination":5,"moon_separation":29.1,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.5,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.65,"date":"2045-03-21","moon_free_dark_hours":7.05,"moon_illumination":11,"moon_separation":30.6,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.7,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.6,"date":"2045-03-22","moon_free_dark_hours":5.82,"moon_illumination":18,"moon_separation":36.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.54,"date":"2045-03-23","moon_free_dark_hours":4.6,"moon_illumination":27,"moon_separation":45.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.49,"date":"2045-03-24","moon_free_dark_hours":3.43,"moon_illumination":38,"moon_separation":56.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.44,"date":"2045-03-25","moon_free_dark_hours":2.42,"moon_illumination":49,"moon_separation":68.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.39,"date":"2045-03-26","moon_free_dark_hours":1.55,"moon_illumination":60,"moon_separation":80.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.33,"date":"2045-03-27","moon_free_dark_hours":0.87,"moon_illumination":71,"moon_separation":92.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.28,"date":"2045-03-28","moon_free_dark_hours":0.28,"moon_illumination":81,"moon_separation":105.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.22,"date":"2045-03-29","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":117.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.17,"date":"2045-03-30","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":129.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.12,"date":"2045-03-31","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":139.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.06,"date":"2045-04-01","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":147.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.01,"date":"2045-04-02","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":151.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.95,"date":"2045-04-03","moon_free_dark_hours":0.83,"moon_illumination":94,"moon_separation":148.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.89,"date":"2045-04-04","moon_free_dark_hours":2.03,"moon_illumination":88,"moon_separation":141.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.84,"date":"2045-04-05","moon_free_dark_hours":3.13,"moon_illumination":81,"moon_separation":133.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.78,"date":"2045-04-06","moon_free_dark_hours":4.13,"moon_illumination":72,"moon_separation":123.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.73,"date":"2045-04-07","moon_free_dark_hours":4.98,"moon_illumination":63,"moon_separation":112.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.67,"date":"2045-04-08","moon_free_dark_hours":5.65,"moon_illumination":54,"moon_separation":102.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.61,"date":"2045-04-09","moon_free_dark_hours":6.2,"moon_illumination":44,"moon_separation":92.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.56,"date":"2045-04-10","moon_free_dark_hours":6.63,"moon_illumination":35,"moon_separation":81.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.5,"date":"2045-04-11","moon_free_dark_hours":7.02,"moon_illumination":26,"moon_separation":71.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.44,"date":"2045-04-12","moon_free_dark_hours":7.33,"moon_illumination":18,"moon_separation":61.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.39,"date":"2045-04-13","moon_free_dark_hours":7.37,"moon_illumination":12,"moon_separation":51.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.33,"date":"2045-04-14","moon_free_dark_hours":7.3,"moon_illumination":6,"moon_separation":42.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.27,"date":"2045-04-15","moon_free_dark_hours":7.25,"moon_illumination":2,"moon_separation":34.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.21,"date":"2045-04-16","moon_free_dark_hours":7.18,"moon_illumination":0,"moon_separation":29.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.15,"date":"2045-04-17","moon_free_dark_hours":7.13,"moon_illumination":1,"moon_separation":29.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.1,"date":"2045-04-18","moon_free_dark_hours":7.07,"moon_illumination":3,"moon_separation":34.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:20","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":"2045-03-20","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}}