{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.83,"best_label":"marginal","best_window":"04:25\u201306:15","dark_hours":10.18,"date":"2040-10-23","moon_free_dark_hours":0.48,"moon_illumination":86,"moon_separation":31.3,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":42.9,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.75,"best_label":"marginal","best_window":"01:30\u201306:15","dark_hours":10.22,"date":"2040-10-24","moon_free_dark_hours":1.22,"moon_illumination":78,"moon_separation":31.9,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":42.9,"transit_local":"04:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.08,"best_label":"marginal","best_window":"01:10\u201306:15","dark_hours":10.26,"date":"2040-10-25","moon_free_dark_hours":2.05,"moon_illumination":69,"moon_separation":36.4,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":42.9,"transit_local":"04:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.42,"best_label":"marginal","best_window":"00:50\u201306:15","dark_hours":10.3,"date":"2040-10-26","moon_free_dark_hours":2.97,"moon_illumination":60,"moon_separation":43.4,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":42.9,"transit_local":"04:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.08,"best_label":"good","best_window":"01:45\u201304:50","dark_hours":10.34,"date":"2040-10-27","moon_free_dark_hours":3.98,"moon_illumination":51,"moon_separation":51.8,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":42.9,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.92,"best_label":"good","best_window":"00:25\u201305:20","dark_hours":10.38,"date":"2040-10-28","moon_free_dark_hours":5.02,"moon_illumination":42,"moon_separation":61.1,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":42.9,"transit_local":"03:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.17,"best_label":"good","best_window":"00:10\u201305:20","dark_hours":10.41,"date":"2040-10-29","moon_free_dark_hours":6.08,"moon_illumination":32,"moon_separation":70.9,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":42.9,"transit_local":"03:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.25,"best_label":"good","best_window":"00:05\u201305:20","dark_hours":10.45,"date":"2040-10-30","moon_free_dark_hours":7.13,"moon_illumination":24,"moon_separation":81.2,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":42.9,"transit_local":"03:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.33,"best_label":"good","best_window":"00:00\u201305:20","dark_hours":10.49,"date":"2040-10-31","moon_free_dark_hours":8.22,"moon_illumination":16,"moon_separation":91.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"03:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.5,"best_label":"good","best_window":"23:55\u201305:25","dark_hours":10.52,"date":"2040-11-01","moon_free_dark_hours":9.3,"moon_illumination":9,"moon_separation":102.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.5,"best_label":"good","best_window":"23:55\u201305:25","dark_hours":10.56,"date":"2040-11-02","moon_free_dark_hours":10.43,"moon_illumination":4,"moon_separation":113.4,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.58,"best_label":"good","best_window":"23:50\u201305:25","dark_hours":10.59,"date":"2040-11-03","moon_free_dark_hours":10.58,"moon_illumination":1,"moon_separation":124.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.67,"best_label":"good","best_window":"23:45\u201305:25","dark_hours":10.63,"date":"2040-11-04","moon_free_dark_hours":10.62,"moon_illumination":0,"moon_separation":134.2,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"03:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.75,"best_label":"good","best_window":"23:40\u201305:25","dark_hours":10.66,"date":"2040-11-05","moon_free_dark_hours":10.65,"moon_illumination":2,"moon_separation":142.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.92,"best_label":"good","best_window":"23:35\u201305:30","dark_hours":10.7,"date":"2040-11-06","moon_free_dark_hours":10.68,"moon_illumination":6,"moon_separation":148.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.92,"best_label":"good","best_window":"23:35\u201305:30","dark_hours":10.73,"date":"2040-11-07","moon_free_dark_hours":10.53,"moon_illumination":12,"moon_separation":148.3,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.0,"best_label":"good","best_window":"23:30\u201305:30","dark_hours":10.76,"date":"2040-11-08","moon_free_dark_hours":9.6,"moon_illumination":21,"moon_separation":143.2,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.08,"best_label":"good","best_window":"23:25\u201305:30","dark_hours":10.8,"date":"2040-11-09","moon_free_dark_hours":8.5,"moon_illumination":31,"moon_separation":134.4,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.25,"best_label":"good","best_window":"23:20\u201305:35","dark_hours":10.83,"date":"2040-11-10","moon_free_dark_hours":7.28,"moon_illumination":42,"moon_separation":123.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.17,"best_label":"good","best_window":"23:25\u201305:35","dark_hours":10.86,"date":"2040-11-11","moon_free_dark_hours":6.03,"moon_illumination":53,"moon_separation":112.4,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.17,"best_label":"good","best_window":"23:25\u201305:35","dark_hours":10.89,"date":"2040-11-12","moon_free_dark_hours":4.8,"moon_illumination":64,"moon_separation":100.6,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.0,"best_label":"good","best_window":"23:35\u201305:35","dark_hours":10.92,"date":"2040-11-13","moon_free_dark_hours":3.6,"moon_illumination":75,"moon_separation":88.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"02:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.17,"best_label":"good","best_window":"00:25\u201305:35","dark_hours":10.95,"date":"2040-11-14","moon_free_dark_hours":2.45,"moon_illumination":84,"moon_separation":77.0,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":42.9,"transit_local":"02:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.83,"best_label":"good","best_window":"02:45\u201305:35","dark_hours":10.98,"date":"2040-11-15","moon_free_dark_hours":1.3,"moon_illumination":91,"moon_separation":65.6,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":42.9,"transit_local":"02:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.5,"best_label":"marginal","best_window":"23:10\u201305:40","dark_hours":11.0,"date":"2040-11-16","moon_free_dark_hours":0.17,"moon_illumination":96,"moon_separation":54.9,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":42.9,"transit_local":"02:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.33,"best_label":"marginal","best_window":"00:20\u201305:40","dark_hours":11.03,"date":"2040-11-17","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":45.2,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":42.9,"transit_local":"02:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.17,"best_label":"marginal","best_window":"03:05\u201305:15","dark_hours":11.06,"date":"2040-11-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":37.2,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":42.9,"transit_local":"02:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.08,"date":"2040-11-19","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":32.2,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":42.9,"transit_local":"02:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.11,"date":"2040-11-20","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":31.3,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"01:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"marginal","best_window":"22:55\u201301:00","dark_hours":11.13,"date":"2040-11-21","moon_free_dark_hours":0.28,"moon_illumination":90,"moon_separation":34.5,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":42.9,"transit_local":"01:50","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":"2040-10-23","target":{"common_name":"Great Orion Nebula","dec":-5.3876,"name":"M 42","ra":83.8201,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M42","source":"sesame","type":"HII","type_text":"HII region \u2014 a star-forming nebula"}}
