{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.43,"date":"2037-08-11","moon_free_dark_hours":6.42,"moon_illumination":0,"moon_separation":68.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.49,"date":"2037-08-12","moon_free_dark_hours":6.47,"moon_illumination":3,"moon_separation":81.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.55,"date":"2037-08-13","moon_free_dark_hours":6.53,"moon_illumination":9,"moon_separation":95.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.6,"date":"2037-08-14","moon_free_dark_hours":6.27,"moon_illumination":17,"moon_separation":108.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.66,"date":"2037-08-15","moon_free_dark_hours":5.77,"moon_illumination":27,"moon_separation":121.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.72,"date":"2037-08-16","moon_free_dark_hours":5.23,"moon_illumination":38,"moon_separation":133.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.78,"date":"2037-08-17","moon_free_dark_hours":4.7,"moon_illumination":49,"moon_separation":143.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.83,"date":"2037-08-18","moon_free_dark_hours":4.1,"moon_illumination":60,"moon_separation":151.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.89,"date":"2037-08-19","moon_free_dark_hours":3.43,"moon_illumination":70,"moon_separation":154.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.95,"date":"2037-08-20","moon_free_dark_hours":2.67,"moon_illumination":79,"moon_separation":151.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.01,"date":"2037-08-21","moon_free_dark_hours":1.85,"moon_illumination":86,"moon_separation":144.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.06,"date":"2037-08-22","moon_free_dark_hours":0.93,"moon_illumination":92,"moon_separation":135.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.12,"date":"2037-08-23","moon_free_dark_hours":0.02,"moon_illumination":97,"moon_separation":125.7,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.18,"date":"2037-08-24","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":115.2,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:55\u201305:05","dark_hours":7.24,"date":"2037-08-25","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":104.6,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.25,"best_label":"marginal","best_window":"04:50\u201305:05","dark_hours":7.29,"date":"2037-08-26","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":93.9,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:55\u201305:05","dark_hours":7.35,"date":"2037-08-27","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":83.2,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":42.9,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:55\u201305:05","dark_hours":7.41,"date":"2037-08-28","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":72.6,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":42.9,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"05:00\u201305:10","dark_hours":7.46,"date":"2037-08-29","moon_free_dark_hours":0.42,"moon_illumination":85,"moon_separation":62.2,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":42.9,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"marginal","best_window":"05:00\u201305:10","dark_hours":7.52,"date":"2037-08-30","moon_free_dark_hours":0.9,"moon_illumination":78,"moon_separation":52.0,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":42.9,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.25,"best_label":"marginal","best_window":"04:55\u201305:10","dark_hours":7.57,"date":"2037-08-31","moon_free_dark_hours":1.4,"moon_illumination":69,"moon_separation":42.3,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":42.9,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"marginal","best_window":"04:45\u201305:10","dark_hours":7.63,"date":"2037-09-01","moon_free_dark_hours":1.95,"moon_illumination":60,"moon_separation":33.6,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":42.9,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.75,"best_label":"marginal","best_window":"04:30\u201305:15","dark_hours":7.69,"date":"2037-09-02","moon_free_dark_hours":2.58,"moon_illumination":50,"moon_separation":27.4,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":42.9,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.92,"best_label":"marginal","best_window":"04:20\u201305:15","dark_hours":7.74,"date":"2037-09-03","moon_free_dark_hours":3.33,"moon_illumination":40,"moon_separation":25.8,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":42.9,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"05:10\u201305:15","dark_hours":7.8,"date":"2037-09-04","moon_free_dark_hours":4.2,"moon_illumination":29,"moon_separation":30.0,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.5,"best_label":"good","best_window":"04:50\u201305:20","dark_hours":7.85,"date":"2037-09-05","moon_free_dark_hours":5.22,"moon_illumination":20,"moon_separation":38.6,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":42.9,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.67,"best_label":"good","best_window":"04:40\u201305:20","dark_hours":7.91,"date":"2037-09-06","moon_free_dark_hours":6.35,"moon_illumination":12,"moon_separation":49.7,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":42.9,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.75,"best_label":"good","best_window":"04:35\u201305:20","dark_hours":7.96,"date":"2037-09-07","moon_free_dark_hours":7.6,"moon_illumination":5,"moon_separation":62.2,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":42.9,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.83,"best_label":"good","best_window":"04:30\u201305:20","dark_hours":8.02,"date":"2037-09-08","moon_free_dark_hours":8.0,"moon_illumination":1,"moon_separation":75.5,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":42.9,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.0,"best_label":"good","best_window":"04:25\u201305:25","dark_hours":8.07,"date":"2037-09-09","moon_free_dark_hours":8.05,"moon_illumination":0,"moon_separation":89.2,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":42.9,"transit_local":"07:40","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":"2037-08-11","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"}}