{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.58,"best_label":"good","best_window":"20:05\u201321:40","dark_hours":8.93,"date":"2047-03-16","moon_free_dark_hours":4.48,"moon_illumination":69,"moon_separation":142.7,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":42.9,"transit_local":"18:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.5,"best_label":"good","best_window":"20:05\u201321:35","dark_hours":8.88,"date":"2047-03-17","moon_free_dark_hours":5.57,"moon_illumination":58,"moon_separation":148.0,"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":8.83,"date":"2047-03-18","moon_free_dark_hours":6.47,"moon_illumination":47,"moon_separation":148.4,"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":1.33,"best_label":"good","best_window":"20:10\u201321:30","dark_hours":8.78,"date":"2047-03-19","moon_free_dark_hours":7.18,"moon_illumination":37,"moon_separation":144.0,"score":null,"score_astronomy":33,"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":8.73,"date":"2047-03-20","moon_free_dark_hours":7.77,"moon_illumination":27,"moon_separation":136.5,"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":8.67,"date":"2047-03-21","moon_free_dark_hours":8.25,"moon_illumination":18,"moon_separation":127.4,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":42.9,"transit_local":"18:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.08,"best_label":"good","best_window":"20:10\u201321:15","dark_hours":8.62,"date":"2047-03-22","moon_free_dark_hours":8.62,"moon_illumination":12,"moon_separation":117.6,"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":1.0,"best_label":"good","best_window":"20:15\u201321:15","dark_hours":8.57,"date":"2047-03-23","moon_free_dark_hours":8.55,"moon_illumination":6,"moon_separation":107.4,"score":null,"score_astronomy":27,"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":8.52,"date":"2047-03-24","moon_free_dark_hours":8.5,"moon_illumination":2,"moon_separation":97.1,"score":null,"score_astronomy":25,"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":8.46,"date":"2047-03-25","moon_free_dark_hours":8.45,"moon_illumination":0,"moon_separation":86.9,"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":0.75,"best_label":"good","best_window":"20:15\u201321:00","dark_hours":8.41,"date":"2047-03-26","moon_free_dark_hours":8.4,"moon_illumination":0,"moon_separation":76.7,"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":0.67,"best_label":"good","best_window":"20:20\u201321:00","dark_hours":8.36,"date":"2047-03-27","moon_free_dark_hours":8.33,"moon_illumination":2,"moon_separation":66.8,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":42.9,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.5,"best_label":"good","best_window":"20:20\u201320:50","dark_hours":8.3,"date":"2047-03-28","moon_free_dark_hours":7.72,"moon_illumination":6,"moon_separation":57.2,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":42.9,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.42,"best_label":"good","best_window":"20:20\u201320:45","dark_hours":8.25,"date":"2047-03-29","moon_free_dark_hours":6.67,"moon_illumination":10,"moon_separation":48.2,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":42.9,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.25,"best_label":"good","best_window":"20:20\u201320:35","dark_hours":8.2,"date":"2047-03-30","moon_free_dark_hours":5.65,"moon_illumination":17,"moon_separation":40.3,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":42.9,"transit_local":"17:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.42,"best_label":"marginal","best_window":"20:50\u201322:15","dark_hours":8.14,"date":"2047-03-31","moon_free_dark_hours":4.67,"moon_illumination":25,"moon_separation":34.1,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":42.9,"transit_local":"18:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.75,"best_label":"marginal","best_window":"21:25\u201322:10","dark_hours":8.09,"date":"2047-04-01","moon_free_dark_hours":3.73,"moon_illumination":33,"moon_separation":31.1,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":42.9,"transit_local":"18:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.58,"best_label":"marginal","best_window":"21:25\u201322:00","dark_hours":8.03,"date":"2047-04-02","moon_free_dark_hours":2.9,"moon_illumination":43,"moon_separation":32.2,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":42.9,"transit_local":"18:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.42,"best_label":"marginal","best_window":"21:25\u201321:50","dark_hours":7.98,"date":"2047-04-03","moon_free_dark_hours":2.17,"moon_illumination":53,"moon_separation":37.4,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":42.9,"transit_local":"18:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.17,"best_label":"marginal","best_window":"21:30\u201321:40","dark_hours":7.92,"date":"2047-04-04","moon_free_dark_hours":1.53,"moon_illumination":63,"moon_separation":45.4,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"marginal","best_window":"21:30\u201321:35","dark_hours":7.87,"date":"2047-04-05","moon_free_dark_hours":0.97,"moon_illumination":74,"moon_separation":55.5,"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":0.08,"best_label":"marginal","best_window":"21:30\u201321:35","dark_hours":7.81,"date":"2047-04-06","moon_free_dark_hours":0.47,"moon_illumination":83,"moon_separation":66.8,"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":7.75,"date":"2047-04-07","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":79.0,"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":0.08,"best_label":"marginal","best_window":"21:35\u201321:40","dark_hours":7.7,"date":"2047-04-08","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":91.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.08,"best_label":"marginal","best_window":"21:35\u201321:40","dark_hours":7.64,"date":"2047-04-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":104.7,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.58,"date":"2047-04-10","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":117.4,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.53,"date":"2047-04-11","moon_free_dark_hours":0.23,"moon_illumination":96,"moon_separation":129.4,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.47,"date":"2047-04-12","moon_free_dark_hours":1.52,"moon_illumination":91,"moon_separation":139.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.41,"date":"2047-04-13","moon_free_dark_hours":2.72,"moon_illumination":83,"moon_separation":146.9,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.36,"date":"2047-04-14","moon_free_dark_hours":3.7,"moon_illumination":73,"moon_separation":149.1,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2047-03-16","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"}}