{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.41,"date":"2047-08-11","moon_free_dark_hours":0.52,"moon_illumination":67,"moon_separation":61.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.47,"date":"2047-08-12","moon_free_dark_hours":1.03,"moon_illumination":57,"moon_separation":52.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.52,"date":"2047-08-13","moon_free_dark_hours":1.62,"moon_illumination":48,"moon_separation":43.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.58,"date":"2047-08-14","moon_free_dark_hours":2.32,"moon_illumination":39,"moon_separation":36.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.64,"date":"2047-08-15","moon_free_dark_hours":3.12,"moon_illumination":30,"moon_separation":31.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.7,"date":"2047-08-16","moon_free_dark_hours":4.07,"moon_illumination":21,"moon_separation":30.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.75,"date":"2047-08-17","moon_free_dark_hours":5.12,"moon_illumination":13,"moon_separation":34.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.81,"date":"2047-08-18","moon_free_dark_hours":6.27,"moon_illumination":7,"moon_separation":41.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.87,"date":"2047-08-19","moon_free_dark_hours":6.85,"moon_illumination":3,"moon_separation":50.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.93,"date":"2047-08-20","moon_free_dark_hours":6.92,"moon_illumination":0,"moon_separation":61.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.98,"date":"2047-08-21","moon_free_dark_hours":6.97,"moon_illumination":0,"moon_separation":73.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.04,"date":"2047-08-22","moon_free_dark_hours":7.03,"moon_illumination":3,"moon_separation":85.3,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.1,"date":"2047-08-23","moon_free_dark_hours":7.08,"moon_illumination":9,"moon_separation":97.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"05:30\u201305:40","dark_hours":7.15,"date":"2047-08-24","moon_free_dark_hours":7.15,"moon_illumination":16,"moon_separation":110.0,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.25,"best_label":"marginal","best_window":"05:25\u201305:40","dark_hours":7.21,"date":"2047-08-25","moon_free_dark_hours":7.18,"moon_illumination":26,"moon_separation":121.9,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":42.9,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.25,"best_label":"marginal","best_window":"04:50\u201305:05","dark_hours":7.27,"date":"2047-08-26","moon_free_dark_hours":6.6,"moon_illumination":36,"moon_separation":132.9,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":42.9,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.25,"best_label":"marginal","best_window":"04:50\u201305:05","dark_hours":7.33,"date":"2047-08-27","moon_free_dark_hours":5.87,"moon_illumination":48,"moon_separation":142.1,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":42.9,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.5,"best_label":"marginal","best_window":"05:15\u201305:45","dark_hours":7.38,"date":"2047-08-28","moon_free_dark_hours":5.0,"moon_illumination":59,"moon_separation":148.2,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":42.9,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.08,"best_label":"marginal","best_window":"04:40\u201305:45","dark_hours":7.44,"date":"2047-08-29","moon_free_dark_hours":4.0,"moon_illumination":70,"moon_separation":149.3,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":42.9,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"05:05\u201305:10","dark_hours":7.49,"date":"2047-08-30","moon_free_dark_hours":2.9,"moon_illumination":80,"moon_separation":145.1,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":42.9,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"good","best_window":"05:05\u201305:10","dark_hours":7.55,"date":"2047-08-31","moon_free_dark_hours":1.77,"moon_illumination":88,"moon_separation":137.4,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":42.9,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"good","best_window":"05:00\u201305:10","dark_hours":7.61,"date":"2047-09-01","moon_free_dark_hours":0.63,"moon_illumination":94,"moon_separation":127.8,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"good","best_window":"05:05\u201305:15","dark_hours":7.66,"date":"2047-09-02","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":117.4,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.08,"best_label":"good","best_window":"05:10\u201305:15","dark_hours":7.72,"date":"2047-09-03","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":106.6,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.0,"best_label":"marginal","best_window":"04:15\u201305:15","dark_hours":7.77,"date":"2047-09-04","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":95.8,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":42.9,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.92,"best_label":"marginal","best_window":"04:20\u201305:15","dark_hours":7.83,"date":"2047-09-05","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":85.1,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":42.9,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.92,"best_label":"marginal","best_window":"04:25\u201305:20","dark_hours":7.88,"date":"2047-09-06","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":74.7,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":42.9,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.83,"best_label":"marginal","best_window":"04:30\u201305:20","dark_hours":7.94,"date":"2047-09-07","moon_free_dark_hours":0.0,"moon_illumination":88,"moon_separation":64.5,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":42.9,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.83,"best_label":"marginal","best_window":"04:30\u201305:20","dark_hours":7.99,"date":"2047-09-08","moon_free_dark_hours":0.0,"moon_illumination":81,"moon_separation":54.9,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":42.9,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.92,"best_label":"marginal","best_window":"04:25\u201305:20","dark_hours":8.05,"date":"2047-09-09","moon_free_dark_hours":0.48,"moon_illumination":73,"moon_separation":46.0,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":42.9,"transit_local":"07:40","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":"2047-08-11","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"}}