{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.67,"date":"2037-05-13","moon_free_dark_hours":5.65,"moon_illumination":2,"moon_separation":48.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.61,"date":"2037-05-14","moon_free_dark_hours":5.6,"moon_illumination":0,"moon_separation":38.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.56,"date":"2037-05-15","moon_free_dark_hours":5.55,"moon_illumination":1,"moon_separation":30.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.51,"date":"2037-05-16","moon_free_dark_hours":5.48,"moon_illumination":3,"moon_separation":25.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.46,"date":"2037-05-17","moon_free_dark_hours":5.25,"moon_illumination":8,"moon_separation":27.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.4,"date":"2037-05-18","moon_free_dark_hours":4.25,"moon_illumination":15,"moon_separation":33.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.35,"date":"2037-05-19","moon_free_dark_hours":3.35,"moon_illumination":24,"moon_separation":43.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.3,"date":"2037-05-20","moon_free_dark_hours":2.53,"moon_illumination":34,"moon_separation":54.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.25,"date":"2037-05-21","moon_free_dark_hours":1.82,"moon_illumination":45,"moon_separation":67.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.21,"date":"2037-05-22","moon_free_dark_hours":1.17,"moon_illumination":56,"moon_separation":79.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.16,"date":"2037-05-23","moon_free_dark_hours":0.6,"moon_illumination":68,"moon_separation":92.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.11,"date":"2037-05-24","moon_free_dark_hours":0.05,"moon_illumination":78,"moon_separation":105.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.07,"date":"2037-05-25","moon_free_dark_hours":0.0,"moon_illumination":87,"moon_separation":118.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.02,"date":"2037-05-26","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":130.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.98,"date":"2037-05-27","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":141.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.94,"date":"2037-05-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":150.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.9,"date":"2037-05-29","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":154.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.86,"date":"2037-05-30","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":152.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.82,"date":"2037-05-31","moon_free_dark_hours":0.2,"moon_illumination":92,"moon_separation":145.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.78,"date":"2037-06-01","moon_free_dark_hours":1.0,"moon_illumination":85,"moon_separation":136.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.75,"date":"2037-06-02","moon_free_dark_hours":1.68,"moon_illumination":77,"moon_separation":126.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.72,"date":"2037-06-03","moon_free_dark_hours":2.27,"moon_illumination":69,"moon_separation":116.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.68,"date":"2037-06-04","moon_free_dark_hours":2.77,"moon_illumination":60,"moon_separation":105.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.65,"date":"2037-06-05","moon_free_dark_hours":3.22,"moon_illumination":50,"moon_separation":94.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.62,"date":"2037-06-06","moon_free_dark_hours":3.63,"moon_illumination":41,"moon_separation":84.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.6,"date":"2037-06-07","moon_free_dark_hours":4.05,"moon_illumination":32,"moon_separation":73.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.57,"date":"2037-06-08","moon_free_dark_hours":4.47,"moon_illumination":23,"moon_separation":62.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.55,"date":"2037-06-09","moon_free_dark_hours":4.53,"moon_illumination":15,"moon_separation":52.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.53,"date":"2037-06-10","moon_free_dark_hours":4.52,"moon_illumination":9,"moon_separation":42.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.51,"date":"2037-06-11","moon_free_dark_hours":4.5,"moon_illumination":4,"moon_separation":33.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Thu"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2037-05-13","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"}}