{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.84,"date":"2027-05-31","moon_free_dark_hours":4.32,"moon_illumination":19,"moon_separation":69.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.8,"date":"2027-06-01","moon_free_dark_hours":4.75,"moon_illumination":11,"moon_separation":58.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.77,"date":"2027-06-02","moon_free_dark_hours":4.77,"moon_illumination":5,"moon_separation":48.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.73,"date":"2027-06-03","moon_free_dark_hours":4.72,"moon_illumination":1,"moon_separation":39.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.7,"date":"2027-06-04","moon_free_dark_hours":4.68,"moon_illumination":0,"moon_separation":33.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.67,"date":"2027-06-05","moon_free_dark_hours":4.65,"moon_illumination":2,"moon_separation":32.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.64,"date":"2027-06-06","moon_free_dark_hours":4.62,"moon_illumination":6,"moon_separation":37.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.61,"date":"2027-06-07","moon_free_dark_hours":3.98,"moon_illumination":14,"moon_separation":46.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.59,"date":"2027-06-08","moon_free_dark_hours":3.38,"moon_illumination":23,"moon_separation":56.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.56,"date":"2027-06-09","moon_free_dark_hours":2.9,"moon_illumination":33,"moon_separation":68.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.54,"date":"2027-06-10","moon_free_dark_hours":2.47,"moon_illumination":44,"moon_separation":80.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.52,"date":"2027-06-11","moon_free_dark_hours":2.08,"moon_illumination":55,"moon_separation":91.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.5,"date":"2027-06-12","moon_free_dark_hours":1.68,"moon_illumination":66,"moon_separation":102.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.48,"date":"2027-06-13","moon_free_dark_hours":1.28,"moon_illumination":76,"moon_separation":113.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.47,"date":"2027-06-14","moon_free_dark_hours":0.83,"moon_illumination":84,"moon_separation":124.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.45,"date":"2027-06-15","moon_free_dark_hours":0.3,"moon_illumination":91,"moon_separation":133.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2027-06-16","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":140.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2027-06-17","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":145.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2027-06-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":147.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2027-06-19","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":145.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2027-06-20","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":139.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2027-06-21","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":132.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2027-06-22","moon_free_dark_hours":0.28,"moon_illumination":87,"moon_separation":123.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2027-06-23","moon_free_dark_hours":0.67,"moon_illumination":80,"moon_separation":114.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2027-06-24","moon_free_dark_hours":1.02,"moon_illumination":72,"moon_separation":104.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2027-06-25","moon_free_dark_hours":1.35,"moon_illumination":62,"moon_separation":94.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.45,"date":"2027-06-26","moon_free_dark_hours":1.68,"moon_illumination":53,"moon_separation":84.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.46,"date":"2027-06-27","moon_free_dark_hours":2.03,"moon_illumination":43,"moon_separation":73.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.48,"date":"2027-06-28","moon_free_dark_hours":2.45,"moon_illumination":32,"moon_separation":63.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.49,"date":"2027-06-29","moon_free_dark_hours":2.97,"moon_illumination":23,"moon_separation":52.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2027-05-31","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"}}