{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":3.0,"best_label":"marginal","best_window":"02:00\u201305:00","dark_hours":8.17,"date":"2025-09-11","moon_free_dark_hours":0.22,"moon_illumination":78,"moon_separation":73.8,"score":28,"score_astronomy":100,"score_weather":28,"transit_alt":87.3,"transit_local":"22:55","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.75,"best_label":"good","best_window":"21:15\u201322:00","dark_hours":8.23,"date":"2025-09-12","moon_free_dark_hours":0.87,"moon_illumination":67,"moon_separation":80.9,"score":27,"score_astronomy":100,"score_weather":27,"transit_alt":87.2,"transit_local":"22:50","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":7.58,"best_label":"good","best_window":"21:10\u201304:45","dark_hours":8.28,"date":"2025-09-13","moon_free_dark_hours":1.67,"moon_illumination":56,"moon_separation":88.3,"score":94,"score_astronomy":100,"score_weather":94,"transit_alt":87.2,"transit_local":"22:50","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":2.0,"best_label":"good","best_window":"02:00\u201304:00","dark_hours":8.33,"date":"2025-09-14","moon_free_dark_hours":2.63,"moon_illumination":44,"moon_separation":95.7,"score":35,"score_astronomy":100,"score_weather":35,"transit_alt":87.3,"transit_local":"22:45","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":7.75,"best_label":"good","best_window":"21:05\u201304:50","dark_hours":8.38,"date":"2025-09-15","moon_free_dark_hours":3.77,"moon_illumination":34,"moon_separation":102.8,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":87.3,"transit_local":"22:40","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":7.75,"best_label":"good","best_window":"21:05\u201304:50","dark_hours":8.44,"date":"2025-09-16","moon_free_dark_hours":5.0,"moon_illumination":24,"moon_separation":109.1,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":87.2,"transit_local":"22:35","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":7.67,"best_label":"good","best_window":"21:05\u201304:45","dark_hours":8.49,"date":"2025-09-17","moon_free_dark_hours":6.23,"moon_illumination":15,"moon_separation":114.5,"score":92,"score_astronomy":100,"score_weather":92,"transit_alt":87.2,"transit_local":"22:35","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":7.83,"best_label":"good","best_window":"21:00\u201304:50","dark_hours":8.54,"date":"2025-09-18","moon_free_dark_hours":7.43,"moon_illumination":8,"moon_separation":118.6,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":87.3,"transit_local":"22:30","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":7.67,"best_label":"good","best_window":"21:00\u201304:40","dark_hours":8.59,"date":"2025-09-19","moon_free_dark_hours":8.57,"moon_illumination":4,"moon_separation":121.2,"score":98,"score_astronomy":100,"score_weather":98,"transit_alt":87.3,"transit_local":"22:25","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":3.67,"best_label":"good","best_window":"01:00\u201304:40","dark_hours":8.64,"date":"2025-09-20","moon_free_dark_hours":8.62,"moon_illumination":1,"moon_separation":122.0,"score":73,"score_astronomy":100,"score_weather":73,"transit_alt":87.3,"transit_local":"22:20","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":7.67,"best_label":"good","best_window":"20:55\u201304:35","dark_hours":8.7,"date":"2025-09-21","moon_free_dark_hours":8.68,"moon_illumination":0,"moon_separation":121.2,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":87.2,"transit_local":"22:15","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":7.67,"best_label":"good","best_window":"20:55\u201304:35","dark_hours":8.75,"date":"2025-09-22","moon_free_dark_hours":8.73,"moon_illumination":1,"moon_separation":118.8,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":87.2,"transit_local":"22:15","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":7.67,"best_label":"good","best_window":"20:50\u201304:30","dark_hours":8.8,"date":"2025-09-23","moon_free_dark_hours":8.78,"moon_illumination":4,"moon_separation":115.1,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":87.3,"transit_local":"22:10","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":7.17,"best_label":"good","best_window":"20:50\u201304:00","dark_hours":8.85,"date":"2025-09-24","moon_free_dark_hours":8.83,"moon_illumination":9,"moon_separation":110.4,"score":95,"score_astronomy":100,"score_weather":95,"transit_alt":87.3,"transit_local":"22:05","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.9,"date":"2025-09-25","moon_free_dark_hours":8.88,"moon_illumination":15,"moon_separation":105.0,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":87.3,"transit_local":"22:00","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":1.0,"best_label":"good","best_window":"00:00\u201301:00","dark_hours":8.95,"date":"2025-09-26","moon_free_dark_hours":8.77,"moon_illumination":22,"moon_separation":99.1,"score":20,"score_astronomy":100,"score_weather":20,"transit_alt":87.2,"transit_local":"21:55","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.25,"best_label":"good","best_window":"20:45\u201321:00","dark_hours":9.0,"date":"2025-09-27","moon_free_dark_hours":8.18,"moon_illumination":31,"moon_separation":93.0,"score":16,"score_astronomy":100,"score_weather":16,"transit_alt":87.2,"transit_local":"21:55","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.05,"date":"2025-09-28","moon_free_dark_hours":7.48,"moon_illumination":40,"moon_separation":86.6,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":87.3,"transit_local":"21:50","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.09,"date":"2025-09-29","moon_free_dark_hours":6.62,"moon_illumination":49,"moon_separation":80.4,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":87.3,"transit_local":"21:45","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":4.0,"best_label":"good","best_window":"00:00\u201304:00","dark_hours":9.14,"date":"2025-09-30","moon_free_dark_hours":5.6,"moon_illumination":59,"moon_separation":74.3,"score":50,"score_astronomy":100,"score_weather":50,"transit_alt":87.2,"transit_local":"21:40","verdict":"marginal","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.19,"date":"2025-10-01","moon_free_dark_hours":4.48,"moon_illumination":69,"moon_separation":68.6,"score":0,"score_astronomy":93,"score_weather":0,"transit_alt":87.2,"transit_local":"21:40","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.24,"date":"2025-10-02","moon_free_dark_hours":3.3,"moon_illumination":78,"moon_separation":63.8,"score":0,"score_astronomy":85,"score_weather":0,"transit_alt":87.3,"transit_local":"21:35","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.29,"date":"2025-10-03","moon_free_dark_hours":2.1,"moon_illumination":86,"moon_separation":60.1,"score":0,"score_astronomy":63,"score_weather":0,"transit_alt":87.3,"transit_local":"21:30","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":7.75,"best_label":"marginal","best_window":"20:30\u201304:15","dark_hours":9.33,"date":"2025-10-04","moon_free_dark_hours":0.87,"moon_illumination":93,"moon_separation":58.1,"score":56,"score_astronomy":60,"score_weather":94,"transit_alt":87.3,"transit_local":"21:25","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":2.5,"best_label":"marginal","best_window":"20:30\u201323:00","dark_hours":9.38,"date":"2025-10-05","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":58.3,"score":32,"score_astronomy":57,"score_weather":56,"transit_alt":87.2,"transit_local":"21:20","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.43,"date":"2025-10-06","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":60.8,"score":0,"score_astronomy":57,"score_weather":0,"transit_alt":87.2,"transit_local":"21:20","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.47,"date":"2025-10-07","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":65.3,"score":0,"score_astronomy":65,"score_weather":0,"transit_alt":87.3,"transit_local":"21:15","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.52,"date":"2025-10-08","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":71.4,"score":0,"score_astronomy":71,"score_weather":0,"transit_alt":87.3,"transit_local":"21:10","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":2.33,"best_label":"good","best_window":"20:25\u201322:45","dark_hours":9.57,"date":"2025-10-09","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":78.5,"score":74,"score_astronomy":78,"score_weather":95,"transit_alt":87.3,"transit_local":"21:05","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":4.75,"best_label":"good","best_window":"20:20\u201301:05","dark_hours":9.61,"date":"2025-10-10","moon_free_dark_hours":0.38,"moon_illumination":80,"moon_separation":86.2,"score":82,"score_astronomy":100,"score_weather":82,"transit_alt":87.2,"transit_local":"21:00","verdict":"good","weather_source":"history","weekday":"Fri"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2025-09-11","target":{"common_name":"North America Nebula","dec":44.33,"name":"NGC 7000","ra":314.69583333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=NGC%207000","source":"sesame","type":"Cl*","type_text":"star cluster"}}
