{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.58,"best_label":"good","best_window":"04:40\u201305:15","dark_hours":7.84,"date":"2038-09-05","moon_free_dark_hours":5.6,"moon_illumination":48,"moon_separation":151.4,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":42.9,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.67,"best_label":"good","best_window":"04:40\u201305:20","dark_hours":7.89,"date":"2038-09-06","moon_free_dark_hours":4.88,"moon_illumination":60,"moon_separation":152.3,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":42.9,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"04:35\u201305:20","dark_hours":7.95,"date":"2038-09-07","moon_free_dark_hours":4.03,"moon_illumination":70,"moon_separation":147.4,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":42.9,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.83,"best_label":"good","best_window":"04:30\u201305:20","dark_hours":8.0,"date":"2038-09-08","moon_free_dark_hours":3.07,"moon_illumination":79,"moon_separation":139.0,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":42.9,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.0,"best_label":"good","best_window":"04:25\u201305:25","dark_hours":8.06,"date":"2038-09-09","moon_free_dark_hours":2.07,"moon_illumination":87,"moon_separation":128.9,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":42.9,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.0,"best_label":"good","best_window":"04:25\u201305:25","dark_hours":8.11,"date":"2038-09-10","moon_free_dark_hours":1.0,"moon_illumination":93,"moon_separation":118.1,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":42.9,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.83,"best_label":"good","best_window":"04:35\u201305:25","dark_hours":8.16,"date":"2038-09-11","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":107.1,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":42.9,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.75,"best_label":"good","best_window":"04:40\u201305:25","dark_hours":8.22,"date":"2038-09-12","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":96.0,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":42.9,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"good","best_window":"05:20\u201305:30","dark_hours":8.27,"date":"2038-09-13","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":85.1,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":42.9,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.67,"best_label":"marginal","best_window":"03:50\u201305:30","dark_hours":8.32,"date":"2038-09-14","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":74.3,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":42.9,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.58,"best_label":"marginal","best_window":"03:55\u201305:30","dark_hours":8.38,"date":"2038-09-15","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":63.9,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.5,"best_label":"marginal","best_window":"04:00\u201305:30","dark_hours":8.43,"date":"2038-09-16","moon_free_dark_hours":0.2,"moon_illumination":89,"moon_separation":53.9,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":42.9,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.5,"best_label":"marginal","best_window":"04:05\u201305:35","dark_hours":8.48,"date":"2038-09-17","moon_free_dark_hours":0.65,"moon_illumination":83,"moon_separation":44.5,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":42.9,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.67,"best_label":"marginal","best_window":"03:55\u201305:35","dark_hours":8.53,"date":"2038-09-18","moon_free_dark_hours":1.15,"moon_illumination":75,"moon_separation":36.2,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":42.9,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.83,"best_label":"marginal","best_window":"03:45\u201305:35","dark_hours":8.59,"date":"2038-09-19","moon_free_dark_hours":1.72,"moon_illumination":67,"moon_separation":30.0,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.17,"best_label":"marginal","best_window":"03:25\u201305:35","dark_hours":8.64,"date":"2038-09-20","moon_free_dark_hours":2.35,"moon_illumination":57,"moon_separation":27.4,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":42.9,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.42,"best_label":"marginal","best_window":"03:10\u201305:35","dark_hours":8.69,"date":"2038-09-21","moon_free_dark_hours":3.1,"moon_illumination":48,"moon_separation":29.5,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":42.9,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.58,"best_label":"good","best_window":"04:05\u201305:40","dark_hours":8.74,"date":"2038-09-22","moon_free_dark_hours":3.97,"moon_illumination":38,"moon_separation":35.7,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":42.9,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.92,"best_label":"good","best_window":"03:45\u201305:40","dark_hours":8.79,"date":"2038-09-23","moon_free_dark_hours":4.97,"moon_illumination":28,"moon_separation":44.6,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":42.9,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.08,"best_label":"good","best_window":"03:35\u201305:40","dark_hours":8.84,"date":"2038-09-24","moon_free_dark_hours":6.08,"moon_illumination":19,"moon_separation":55.2,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":42.9,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.25,"best_label":"good","best_window":"03:25\u201305:40","dark_hours":8.89,"date":"2038-09-25","moon_free_dark_hours":7.25,"moon_illumination":11,"moon_separation":66.8,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":42.9,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"03:20\u201305:45","dark_hours":8.94,"date":"2038-09-26","moon_free_dark_hours":8.5,"moon_illumination":5,"moon_separation":79.3,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":42.9,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.5,"best_label":"good","best_window":"03:15\u201305:45","dark_hours":8.99,"date":"2038-09-27","moon_free_dark_hours":8.97,"moon_illumination":1,"moon_separation":92.2,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":42.9,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.58,"best_label":"good","best_window":"03:10\u201305:45","dark_hours":9.04,"date":"2038-09-28","moon_free_dark_hours":9.02,"moon_illumination":0,"moon_separation":105.4,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":42.9,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.58,"best_label":"good","best_window":"03:10\u201305:45","dark_hours":9.09,"date":"2038-09-29","moon_free_dark_hours":9.08,"moon_illumination":2,"moon_separation":118.4,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":42.9,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.75,"best_label":"good","best_window":"03:05\u201305:50","dark_hours":9.14,"date":"2038-09-30","moon_free_dark_hours":9.12,"moon_illumination":7,"moon_separation":130.8,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":42.9,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"03:00\u201305:50","dark_hours":9.18,"date":"2038-10-01","moon_free_dark_hours":8.83,"moon_illumination":14,"moon_separation":141.8,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":42.9,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"good","best_window":"02:55\u201305:50","dark_hours":9.23,"date":"2038-10-02","moon_free_dark_hours":8.22,"moon_illumination":23,"moon_separation":149.8,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":42.9,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"02:50\u201305:50","dark_hours":9.28,"date":"2038-10-03","moon_free_dark_hours":7.48,"moon_illumination":34,"moon_separation":152.5,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":42.9,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.0,"best_label":"good","best_window":"02:50\u201305:50","dark_hours":9.33,"date":"2038-10-04","moon_free_dark_hours":6.65,"moon_illumination":45,"moon_separation":148.8,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":42.9,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Mon"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2038-09-05","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"}}