{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.68,"date":"2041-06-04","moon_free_dark_hours":2.33,"moon_illumination":32,"moon_separation":66.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.65,"date":"2041-06-05","moon_free_dark_hours":1.92,"moon_illumination":41,"moon_separation":76.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.62,"date":"2041-06-06","moon_free_dark_hours":1.53,"moon_illumination":50,"moon_separation":86.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.6,"date":"2041-06-07","moon_free_dark_hours":1.18,"moon_illumination":60,"moon_separation":96.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.57,"date":"2041-06-08","moon_free_dark_hours":0.87,"moon_illumination":69,"moon_separation":107.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.55,"date":"2041-06-09","moon_free_dark_hours":0.5,"moon_illumination":78,"moon_separation":117.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.53,"date":"2041-06-10","moon_free_dark_hours":0.13,"moon_illumination":86,"moon_separation":127.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.51,"date":"2041-06-11","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":136.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.49,"date":"2041-06-12","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":144.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.47,"date":"2041-06-13","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":148.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.46,"date":"2041-06-14","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":146.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.45,"date":"2041-06-15","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":140.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2041-06-16","moon_free_dark_hours":0.38,"moon_illumination":92,"moon_separation":131.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2041-06-17","moon_free_dark_hours":1.07,"moon_illumination":84,"moon_separation":120.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2041-06-18","moon_free_dark_hours":1.63,"moon_illumination":74,"moon_separation":108.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2041-06-19","moon_free_dark_hours":2.1,"moon_illumination":64,"moon_separation":96.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2041-06-20","moon_free_dark_hours":2.5,"moon_illumination":52,"moon_separation":84.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2041-06-21","moon_free_dark_hours":2.88,"moon_illumination":41,"moon_separation":72.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2041-06-22","moon_free_dark_hours":3.28,"moon_illumination":30,"moon_separation":61.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2041-06-23","moon_free_dark_hours":3.7,"moon_illumination":21,"moon_separation":50.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2041-06-24","moon_free_dark_hours":4.18,"moon_illumination":13,"moon_separation":41.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.45,"date":"2041-06-25","moon_free_dark_hours":4.43,"moon_illumination":7,"moon_separation":35.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.46,"date":"2041-06-26","moon_free_dark_hours":4.43,"moon_illumination":2,"moon_separation":31.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.47,"date":"2041-06-27","moon_free_dark_hours":4.45,"moon_illumination":0,"moon_separation":33.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.49,"date":"2041-06-28","moon_free_dark_hours":4.48,"moon_illumination":0,"moon_separation":38.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.5,"date":"2041-06-29","moon_free_dark_hours":4.48,"moon_illumination":2,"moon_separation":45.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.52,"date":"2041-06-30","moon_free_dark_hours":4.5,"moon_illumination":6,"moon_separation":54.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.55,"date":"2041-07-01","moon_free_dark_hours":4.35,"moon_illumination":11,"moon_separation":63.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.57,"date":"2041-07-02","moon_free_dark_hours":3.93,"moon_illumination":18,"moon_separation":73.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.59,"date":"2041-07-03","moon_free_dark_hours":3.57,"moon_illumination":26,"moon_separation":83.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:10","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":"2041-06-04","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"}}