{"calculation_version":"2026-10-10.1","days":30,"nights":[{"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"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.51,"date":"2027-06-30","moon_free_dark_hours":3.62,"moon_illumination":14,"moon_separation":43.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.53,"date":"2027-07-01","moon_free_dark_hours":4.43,"moon_illumination":7,"moon_separation":35.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.55,"date":"2027-07-02","moon_free_dark_hours":4.53,"moon_illumination":2,"moon_separation":32.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.58,"date":"2027-07-03","moon_free_dark_hours":4.55,"moon_illumination":0,"moon_separation":35.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.6,"date":"2027-07-04","moon_free_dark_hours":4.58,"moon_illumination":1,"moon_separation":42.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.63,"date":"2027-07-05","moon_free_dark_hours":4.62,"moon_illumination":5,"moon_separation":52.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.66,"date":"2027-07-06","moon_free_dark_hours":4.63,"moon_illumination":11,"moon_separation":64.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.69,"date":"2027-07-07","moon_free_dark_hours":4.6,"moon_illumination":20,"moon_separation":76.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.72,"date":"2027-07-08","moon_free_dark_hours":4.2,"moon_illumination":30,"moon_separation":88.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.76,"date":"2027-07-09","moon_free_dark_hours":3.85,"moon_illumination":41,"moon_separation":100.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.79,"date":"2027-07-10","moon_free_dark_hours":3.47,"moon_illumination":52,"moon_separation":111.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.83,"date":"2027-07-11","moon_free_dark_hours":3.05,"moon_illumination":62,"moon_separation":121.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.87,"date":"2027-07-12","moon_free_dark_hours":2.57,"moon_illumination":72,"moon_separation":131.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.9,"date":"2027-07-13","moon_free_dark_hours":2.0,"moon_illumination":80,"moon_separation":139.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.95,"date":"2027-07-14","moon_free_dark_hours":1.32,"moon_illumination":88,"moon_separation":144.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.99,"date":"2027-07-15","moon_free_dark_hours":0.5,"moon_illumination":93,"moon_separation":147.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.03,"date":"2027-07-16","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":146.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.07,"date":"2027-07-17","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":141.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.12,"date":"2027-07-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":134.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.17,"date":"2027-07-19","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":126.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.21,"date":"2027-07-20","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":116.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.26,"date":"2027-07-21","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":107.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"11:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.31,"date":"2027-07-22","moon_free_dark_hours":0.0,"moon_illumination":84,"moon_separation":97.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"10:55","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":"2027-06-23","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"}}