{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.08,"best_label":"marginal","best_window":"19:55\u201322:00","dark_hours":9.24,"date":"2036-03-09","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":58.2,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":42.9,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.25,"best_label":"marginal","best_window":"19:55\u201322:10","dark_hours":9.2,"date":"2036-03-10","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":71.4,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":42.9,"transit_local":"18:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.17,"best_label":"good","best_window":"20:00\u201320:10","dark_hours":9.15,"date":"2036-03-11","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":84.7,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":42.9,"transit_local":"18:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.42,"best_label":"good","best_window":"20:00\u201321:25","dark_hours":9.1,"date":"2036-03-12","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":97.9,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":42.9,"transit_local":"18:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.58,"best_label":"good","best_window":"20:00\u201321:35","dark_hours":9.05,"date":"2036-03-13","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":110.7,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":42.9,"transit_local":"18:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.58,"best_label":"good","best_window":"20:00\u201321:35","dark_hours":9.0,"date":"2036-03-14","moon_free_dark_hours":1.0,"moon_illumination":92,"moon_separation":123.0,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":42.9,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.58,"best_label":"good","best_window":"20:05\u201321:40","dark_hours":8.95,"date":"2036-03-15","moon_free_dark_hours":2.07,"moon_illumination":85,"moon_separation":134.3,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":42.9,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.58,"best_label":"good","best_window":"20:05\u201321:40","dark_hours":8.9,"date":"2036-03-16","moon_free_dark_hours":3.08,"moon_illumination":77,"moon_separation":144.4,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":42.9,"transit_local":"18:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.5,"best_label":"good","best_window":"20:05\u201321:35","dark_hours":8.85,"date":"2036-03-17","moon_free_dark_hours":4.07,"moon_illumination":68,"moon_separation":152.1,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":42.9,"transit_local":"18:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.42,"best_label":"good","best_window":"20:05\u201321:30","dark_hours":8.8,"date":"2036-03-18","moon_free_dark_hours":5.0,"moon_illumination":58,"moon_separation":155.9,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":42.9,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.25,"best_label":"good","best_window":"20:10\u201321:25","dark_hours":8.74,"date":"2036-03-19","moon_free_dark_hours":5.85,"moon_illumination":48,"moon_separation":154.2,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":42.9,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.17,"best_label":"good","best_window":"20:10\u201321:20","dark_hours":8.69,"date":"2036-03-20","moon_free_dark_hours":6.62,"moon_illumination":39,"moon_separation":148.1,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":42.9,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"20:10\u201321:20","dark_hours":8.64,"date":"2036-03-21","moon_free_dark_hours":7.32,"moon_illumination":30,"moon_separation":139.7,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":42.9,"transit_local":"18:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.08,"best_label":"good","best_window":"20:10\u201321:15","dark_hours":8.59,"date":"2036-03-22","moon_free_dark_hours":7.97,"moon_illumination":22,"moon_separation":130.0,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":42.9,"transit_local":"17:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.92,"best_label":"good","best_window":"20:15\u201321:10","dark_hours":8.54,"date":"2036-03-23","moon_free_dark_hours":8.53,"moon_illumination":14,"moon_separation":119.7,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":42.9,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.83,"best_label":"good","best_window":"20:15\u201321:05","dark_hours":8.48,"date":"2036-03-24","moon_free_dark_hours":8.47,"moon_illumination":8,"moon_separation":108.9,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":42.9,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.83,"best_label":"good","best_window":"20:15\u201321:05","dark_hours":8.43,"date":"2036-03-25","moon_free_dark_hours":8.42,"moon_illumination":4,"moon_separation":97.7,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":42.9,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.75,"best_label":"good","best_window":"20:15\u201321:00","dark_hours":8.38,"date":"2036-03-26","moon_free_dark_hours":8.37,"moon_illumination":1,"moon_separation":86.3,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":42.9,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.58,"best_label":"good","best_window":"20:20\u201320:55","dark_hours":8.32,"date":"2036-03-27","moon_free_dark_hours":8.3,"moon_illumination":0,"moon_separation":74.7,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":42.9,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.5,"best_label":"good","best_window":"20:20\u201320:50","dark_hours":8.27,"date":"2036-03-28","moon_free_dark_hours":8.25,"moon_illumination":1,"moon_separation":63.0,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":42.9,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.42,"best_label":"good","best_window":"20:20\u201320:45","dark_hours":8.21,"date":"2036-03-29","moon_free_dark_hours":8.17,"moon_illumination":5,"moon_separation":51.4,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":42.9,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.25,"best_label":"good","best_window":"21:25\u201321:40","dark_hours":8.16,"date":"2036-03-30","moon_free_dark_hours":7.05,"moon_illumination":10,"moon_separation":40.4,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":42.9,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.08,"best_label":"good","best_window":"21:25\u201321:30","dark_hours":8.11,"date":"2036-03-31","moon_free_dark_hours":5.92,"moon_illumination":18,"moon_separation":30.9,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":42.9,"transit_local":"18:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.67,"best_label":"marginal","best_window":"21:25\u201322:05","dark_hours":8.05,"date":"2036-04-01","moon_free_dark_hours":4.8,"moon_illumination":27,"moon_separation":24.8,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":42.9,"transit_local":"18:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.58,"best_label":"marginal","best_window":"21:25\u201322:00","dark_hours":8.0,"date":"2036-04-02","moon_free_dark_hours":3.72,"moon_illumination":38,"moon_separation":25.3,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":42.9,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.33,"best_label":"marginal","best_window":"21:30\u201321:50","dark_hours":7.94,"date":"2036-04-03","moon_free_dark_hours":2.72,"moon_illumination":49,"moon_separation":32.1,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":42.9,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"marginal","best_window":"21:30\u201321:40","dark_hours":7.88,"date":"2036-04-04","moon_free_dark_hours":1.8,"moon_illumination":61,"moon_separation":42.4,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.83,"date":"2036-04-05","moon_free_dark_hours":1.0,"moon_illumination":72,"moon_separation":54.3,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"18:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.77,"date":"2036-04-06","moon_free_dark_hours":0.27,"moon_illumination":81,"moon_separation":66.9,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"17:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.72,"date":"2036-04-07","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":79.9,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:50","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":"2036-03-09","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"}}
