{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.45,"date":"2025-06-15","moon_free_dark_hours":1.25,"moon_illumination":79,"moon_separation":117.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:20","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2025-06-16","moon_free_dark_hours":1.67,"moon_illumination":70,"moon_separation":107.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:20","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2025-06-17","moon_free_dark_hours":2.02,"moon_illumination":60,"moon_separation":96.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:15","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2025-06-18","moon_free_dark_hours":2.38,"moon_illumination":49,"moon_separation":84.6,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:10","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2025-06-19","moon_free_dark_hours":2.75,"moon_illumination":37,"moon_separation":73.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:05","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2025-06-20","moon_free_dark_hours":3.15,"moon_illumination":26,"moon_separation":61.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:00","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2025-06-21","moon_free_dark_hours":3.65,"moon_illumination":17,"moon_separation":50.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"13:00","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.42,"date":"2025-06-22","moon_free_dark_hours":4.27,"moon_illumination":9,"moon_separation":41.5,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:55","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.43,"date":"2025-06-23","moon_free_dark_hours":4.42,"moon_illumination":3,"moon_separation":35.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:50","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2025-06-24","moon_free_dark_hours":4.42,"moon_illumination":1,"moon_separation":33.9,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:45","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.45,"date":"2025-06-25","moon_free_dark_hours":4.43,"moon_illumination":0,"moon_separation":37.7,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:40","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.46,"date":"2025-06-26","moon_free_dark_hours":4.43,"moon_illumination":3,"moon_separation":45.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:40","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.47,"date":"2025-06-27","moon_free_dark_hours":4.45,"moon_illumination":8,"moon_separation":54.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:35","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.48,"date":"2025-06-28","moon_free_dark_hours":4.18,"moon_illumination":15,"moon_separation":65.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:30","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.5,"date":"2025-06-29","moon_free_dark_hours":3.78,"moon_illumination":23,"moon_separation":75.6,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:25","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.52,"date":"2025-06-30","moon_free_dark_hours":3.47,"moon_illumination":32,"moon_separation":86.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:25","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.54,"date":"2025-07-01","moon_free_dark_hours":3.17,"moon_illumination":42,"moon_separation":96.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:20","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.56,"date":"2025-07-02","moon_free_dark_hours":2.87,"moon_illumination":51,"moon_separation":106.2,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:15","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.59,"date":"2025-07-03","moon_free_dark_hours":2.57,"moon_illumination":61,"moon_separation":115.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:10","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.62,"date":"2025-07-04","moon_free_dark_hours":2.23,"moon_illumination":70,"moon_separation":124.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:05","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.64,"date":"2025-07-05","moon_free_dark_hours":1.83,"moon_illumination":78,"moon_separation":133.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"12:00","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.67,"date":"2025-07-06","moon_free_dark_hours":1.33,"moon_illumination":85,"moon_separation":140.0,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:55","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.7,"date":"2025-07-07","moon_free_dark_hours":0.72,"moon_illumination":91,"moon_separation":144.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:50","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.74,"date":"2025-07-08","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":146.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:45","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.77,"date":"2025-07-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":143.9,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:45","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.81,"date":"2025-07-10","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":138.1,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:40","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.85,"date":"2025-07-11","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":129.9,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:35","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.88,"date":"2025-07-12","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":120.3,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:30","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.92,"date":"2025-07-13","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":109.8,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:30","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.97,"date":"2025-07-14","moon_free_dark_hours":0.28,"moon_illumination":82,"moon_separation":98.6,"score":0,"score_astronomy":0,"score_weather":0,"transit_alt":42.9,"transit_local":"11:25","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":"2025-06-15","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"}}