{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.18,"date":"2026-07-19","moon_free_dark_hours":4.57,"moon_illumination":35,"moon_separation":102.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:05","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.22,"date":"2026-07-20","moon_free_dark_hours":4.25,"moon_illumination":45,"moon_separation":113.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:00","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.27,"date":"2026-07-21","moon_free_dark_hours":3.87,"moon_illumination":55,"moon_separation":122.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:55","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.32,"date":"2026-07-22","moon_free_dark_hours":3.47,"moon_illumination":64,"moon_separation":131.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:55","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.37,"date":"2026-07-23","moon_free_dark_hours":2.97,"moon_illumination":73,"moon_separation":138.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:50","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.42,"date":"2026-07-24","moon_free_dark_hours":2.37,"moon_illumination":81,"moon_separation":144.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:45","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.47,"date":"2026-07-25","moon_free_dark_hours":1.62,"moon_illumination":88,"moon_separation":146.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:40","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.52,"date":"2026-07-26","moon_free_dark_hours":0.75,"moon_illumination":93,"moon_separation":145.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:40","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.58,"date":"2026-07-27","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":140.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:35","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.63,"date":"2026-07-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":133.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:30","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.68,"date":"2026-07-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":125.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:25","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.74,"date":"2026-07-30","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":115.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:20","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.79,"date":"2026-07-31","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":105.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:20","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.85,"date":"2026-08-01","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":95.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:15","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.9,"date":"2026-08-02","moon_free_dark_hours":0.0,"moon_illumination":82,"moon_separation":84.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:10","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.96,"date":"2026-08-03","moon_free_dark_hours":0.32,"moon_illumination":73,"moon_separation":73.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:05","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.01,"date":"2026-08-04","moon_free_dark_hours":0.75,"moon_illumination":63,"moon_separation":62.6,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:00","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.07,"date":"2026-08-05","moon_free_dark_hours":1.23,"moon_illumination":52,"moon_separation":52.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:00","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.13,"date":"2026-08-06","moon_free_dark_hours":1.87,"moon_illumination":40,"moon_separation":43.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:55","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.18,"date":"2026-08-07","moon_free_dark_hours":2.67,"moon_illumination":30,"moon_separation":36.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:50","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.24,"date":"2026-08-08","moon_free_dark_hours":3.67,"moon_illumination":19,"moon_separation":33.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:45","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.3,"date":"2026-08-09","moon_free_dark_hours":4.88,"moon_illumination":11,"moon_separation":36.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:45","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.35,"date":"2026-08-10","moon_free_dark_hours":6.22,"moon_illumination":5,"moon_separation":43.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:40","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.41,"date":"2026-08-11","moon_free_dark_hours":6.38,"moon_illumination":1,"moon_separation":53.2,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:35","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.47,"date":"2026-08-12","moon_free_dark_hours":6.45,"moon_illumination":0,"moon_separation":64.3,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:30","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.53,"date":"2026-08-13","moon_free_dark_hours":6.5,"moon_illumination":2,"moon_separation":75.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:25","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.58,"date":"2026-08-14","moon_free_dark_hours":6.57,"moon_illumination":6,"moon_separation":87.4,"score":0,"score_astronomy":0,"score_weather":82,"transit_alt":42.9,"transit_local":"09:25","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.64,"date":"2026-08-15","moon_free_dark_hours":6.62,"moon_illumination":12,"moon_separation":98.6,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:20","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.7,"date":"2026-08-16","moon_free_dark_hours":6.68,"moon_illumination":20,"moon_separation":109.4,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:15","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.76,"date":"2026-08-17","moon_free_dark_hours":6.55,"moon_illumination":29,"moon_separation":119.5,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:10","verdict":"unusable","weather_source":"history","weekday":"Mon"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2026-07-19","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"}}