{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.94,"date":"2040-04-03","moon_free_dark_hours":5.4,"moon_illumination":57,"moon_separation":109.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.88,"date":"2040-04-04","moon_free_dark_hours":6.35,"moon_illumination":46,"moon_separation":98.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.83,"date":"2040-04-05","moon_free_dark_hours":7.12,"moon_illumination":35,"moon_separation":87.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.77,"date":"2040-04-06","moon_free_dark_hours":7.75,"moon_illumination":24,"moon_separation":75.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.72,"date":"2040-04-07","moon_free_dark_hours":7.7,"moon_illumination":16,"moon_separation":64.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.66,"date":"2040-04-08","moon_free_dark_hours":7.65,"moon_illumination":8,"moon_separation":54.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.6,"date":"2040-04-09","moon_free_dark_hours":7.6,"moon_illumination":3,"moon_separation":46.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.55,"date":"2040-04-10","moon_free_dark_hours":7.53,"moon_illumination":1,"moon_separation":39.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.49,"date":"2040-04-11","moon_free_dark_hours":7.48,"moon_illumination":0,"moon_separation":36.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.43,"date":"2040-04-12","moon_free_dark_hours":7.42,"moon_illumination":2,"moon_separation":37.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.37,"date":"2040-04-13","moon_free_dark_hours":7.02,"moon_illumination":6,"moon_separation":41.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.32,"date":"2040-04-14","moon_free_dark_hours":5.9,"moon_illumination":11,"moon_separation":48.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.26,"date":"2040-04-15","moon_free_dark_hours":4.82,"moon_illumination":18,"moon_separation":56.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.2,"date":"2040-04-16","moon_free_dark_hours":3.82,"moon_illumination":26,"moon_separation":64.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.14,"date":"2040-04-17","moon_free_dark_hours":2.9,"moon_illumination":35,"moon_separation":74.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.08,"date":"2040-04-18","moon_free_dark_hours":2.08,"moon_illumination":44,"moon_separation":83.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.5,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.03,"date":"2040-04-19","moon_free_dark_hours":1.4,"moon_illumination":54,"moon_separation":93.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.97,"date":"2040-04-20","moon_free_dark_hours":0.8,"moon_illumination":63,"moon_separation":102.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.91,"date":"2040-04-21","moon_free_dark_hours":0.27,"moon_illumination":72,"moon_separation":112.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"12:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.85,"date":"2040-04-22","moon_free_dark_hours":0.0,"moon_illumination":81,"moon_separation":121.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.6,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.79,"date":"2040-04-23","moon_free_dark_hours":0.0,"moon_illumination":88,"moon_separation":130.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"11:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.74,"date":"2040-04-24","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":137.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.8,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.68,"date":"2040-04-25","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":142.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":89.7,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.62,"date":"2040-04-26","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":143.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.5,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.56,"date":"2040-04-27","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":140.0,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.6,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.5,"date":"2040-04-28","moon_free_dark_hours":0.15,"moon_illumination":96,"moon_separation":132.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.8,"transit_local":"11:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.44,"date":"2040-04-29","moon_free_dark_hours":1.4,"moon_illumination":90,"moon_separation":123.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.8,"transit_local":"11:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.39,"date":"2040-04-30","moon_free_dark_hours":2.58,"moon_illumination":81,"moon_separation":112.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.7,"transit_local":"11:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.33,"date":"2040-05-01","moon_free_dark_hours":3.62,"moon_illumination":71,"moon_separation":101.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.5,"transit_local":"11:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.27,"date":"2040-05-02","moon_free_dark_hours":4.43,"moon_illumination":60,"moon_separation":89.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":89.7,"transit_local":"11:20","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":"2040-04-03","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}}