{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.24,"date":"2025-07-20","moon_free_dark_hours":3.25,"moon_illumination":19,"moon_separation":36.9,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:00","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.28,"date":"2025-07-21","moon_free_dark_hours":4.17,"moon_illumination":11,"moon_separation":33.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:55","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.33,"date":"2025-07-22","moon_free_dark_hours":5.27,"moon_illumination":5,"moon_separation":35.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:50","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.38,"date":"2025-07-23","moon_free_dark_hours":5.37,"moon_illumination":1,"moon_separation":42.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:50","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.43,"date":"2025-07-24","moon_free_dark_hours":5.42,"moon_illumination":0,"moon_separation":50.9,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:45","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.48,"date":"2025-07-25","moon_free_dark_hours":5.47,"moon_illumination":2,"moon_separation":61.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:40","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.54,"date":"2025-07-26","moon_free_dark_hours":5.52,"moon_illumination":5,"moon_separation":71.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:35","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.59,"date":"2025-07-27","moon_free_dark_hours":5.57,"moon_illumination":11,"moon_separation":82.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:35","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.64,"date":"2025-07-28","moon_free_dark_hours":5.63,"moon_illumination":18,"moon_separation":92.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:30","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.7,"date":"2025-07-29","moon_free_dark_hours":5.42,"moon_illumination":26,"moon_separation":102.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:25","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.75,"date":"2025-07-30","moon_free_dark_hours":5.13,"moon_illumination":35,"moon_separation":112.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:20","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.81,"date":"2025-07-31","moon_free_dark_hours":4.8,"moon_illumination":44,"moon_separation":121.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:15","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.86,"date":"2025-08-01","moon_free_dark_hours":4.45,"moon_illumination":54,"moon_separation":130.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:15","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.92,"date":"2025-08-02","moon_free_dark_hours":4.0,"moon_illumination":63,"moon_separation":137.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:10","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.97,"date":"2025-08-03","moon_free_dark_hours":3.47,"moon_illumination":72,"moon_separation":143.4,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:05","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.03,"date":"2025-08-04","moon_free_dark_hours":2.77,"moon_illumination":80,"moon_separation":146.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"10:00","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.08,"date":"2025-08-05","moon_free_dark_hours":1.9,"moon_illumination":88,"moon_separation":145.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:55","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.14,"date":"2025-08-06","moon_free_dark_hours":0.88,"moon_illumination":94,"moon_separation":140.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:55","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.2,"date":"2025-08-07","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":132.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:50","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.25,"date":"2025-08-08","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":123.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:45","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.31,"date":"2025-08-09","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":113.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:40","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.37,"date":"2025-08-10","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":101.9,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:40","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.43,"date":"2025-08-11","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":90.3,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:35","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.48,"date":"2025-08-12","moon_free_dark_hours":0.0,"moon_illumination":84,"moon_separation":78.6,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:30","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.54,"date":"2025-08-13","moon_free_dark_hours":0.3,"moon_illumination":75,"moon_separation":67.1,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:25","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.6,"date":"2025-08-14","moon_free_dark_hours":0.77,"moon_illumination":65,"moon_separation":56.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"09:20","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.66,"date":"2025-08-15","moon_free_dark_hours":1.32,"moon_illumination":53,"moon_separation":46.2,"score":0,"score_astronomy":0,"score_weather":100,"transit_alt":42.9,"transit_local":"09:20","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.71,"date":"2025-08-16","moon_free_dark_hours":1.97,"moon_illumination":42,"moon_separation":38.5,"score":0,"score_astronomy":0,"score_weather":95,"transit_alt":42.9,"transit_local":"09:15","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.77,"date":"2025-08-17","moon_free_dark_hours":2.82,"moon_illumination":31,"moon_separation":34.3,"score":0,"score_astronomy":0,"score_weather":84,"transit_alt":42.9,"transit_local":"09:10","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.83,"date":"2025-08-18","moon_free_dark_hours":3.85,"moon_illumination":21,"moon_separation":34.9,"score":0,"score_astronomy":0,"score_weather":5,"transit_alt":42.9,"transit_local":"09:05","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":"2025-07-20","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"}}