{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":6.0,"best_label":"good","best_window":"21:25\u201303:25","dark_hours":7.88,"date":"2043-09-06","moon_free_dark_hours":7.87,"moon_illumination":11,"moon_separation":102.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"22:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.0,"best_label":"good","best_window":"21:25\u201303:25","dark_hours":7.94,"date":"2043-09-07","moon_free_dark_hours":7.92,"moon_illumination":18,"moon_separation":94.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"22:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.0,"best_label":"good","best_window":"21:20\u201303:20","dark_hours":7.99,"date":"2043-09-08","moon_free_dark_hours":7.7,"moon_illumination":26,"moon_separation":86.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"22:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.92,"best_label":"good","best_window":"21:20\u201303:15","dark_hours":8.05,"date":"2043-09-09","moon_free_dark_hours":7.25,"moon_illumination":35,"moon_separation":78.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"22:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.83,"best_label":"good","best_window":"21:20\u201303:10","dark_hours":8.1,"date":"2043-09-10","moon_free_dark_hours":6.72,"moon_illumination":44,"moon_separation":70.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"22:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.83,"best_label":"good","best_window":"21:15\u201303:05","dark_hours":8.15,"date":"2043-09-11","moon_free_dark_hours":6.02,"moon_illumination":54,"moon_separation":62.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"22:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.83,"best_label":"good","best_window":"21:15\u201303:05","dark_hours":8.21,"date":"2043-09-12","moon_free_dark_hours":5.17,"moon_illumination":63,"moon_separation":56.3,"score":null,"score_astronomy":97,"score_weather":null,"transit_alt":71.1,"transit_local":"21:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.83,"best_label":"good","best_window":"21:10\u201303:00","dark_hours":8.26,"date":"2043-09-13","moon_free_dark_hours":4.18,"moon_illumination":72,"moon_separation":50.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":71.1,"transit_local":"21:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.5,"best_label":"good","best_window":"21:10\u201301:40","dark_hours":8.31,"date":"2043-09-14","moon_free_dark_hours":3.1,"moon_illumination":81,"moon_separation":47.4,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"21:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.08,"best_label":"marginal","best_window":"21:10\u201303:15","dark_hours":8.37,"date":"2043-09-15","moon_free_dark_hours":1.93,"moon_illumination":88,"moon_separation":46.2,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":71.1,"transit_local":"21:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.92,"best_label":"marginal","best_window":"21:05\u201303:00","dark_hours":8.42,"date":"2043-09-16","moon_free_dark_hours":0.73,"moon_illumination":94,"moon_separation":47.8,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"21:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.75,"best_label":"marginal","best_window":"21:05\u201302:50","dark_hours":8.47,"date":"2043-09-17","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":52.3,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":71.1,"transit_local":"21:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.25,"best_label":"good","best_window":"21:00\u201321:15","dark_hours":8.52,"date":"2043-09-18","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":58.9,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":71.1,"transit_local":"21:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.58,"best_label":"good","best_window":"21:00\u201322:35","dark_hours":8.57,"date":"2043-09-19","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":67.3,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"21:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"21:00\u201300:00","dark_hours":8.63,"date":"2043-09-20","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":76.7,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":71.1,"transit_local":"21:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.17,"best_label":"good","best_window":"20:55\u201301:05","dark_hours":8.68,"date":"2043-09-21","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":86.7,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":71.1,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.08,"best_label":"good","best_window":"20:55\u201302:00","dark_hours":8.73,"date":"2043-09-22","moon_free_dark_hours":0.15,"moon_illumination":81,"moon_separation":96.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.17,"best_label":"good","best_window":"20:55\u201302:05","dark_hours":8.78,"date":"2043-09-23","moon_free_dark_hours":0.83,"moon_illumination":71,"moon_separation":106.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.33,"best_label":"good","best_window":"20:50\u201302:10","dark_hours":8.83,"date":"2043-09-24","moon_free_dark_hours":1.68,"moon_illumination":60,"moon_separation":115.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.25,"best_label":"good","best_window":"20:50\u201302:05","dark_hours":8.88,"date":"2043-09-25","moon_free_dark_hours":2.72,"moon_illumination":48,"moon_separation":123.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.33,"best_label":"good","best_window":"20:45\u201302:05","dark_hours":8.93,"date":"2043-09-26","moon_free_dark_hours":3.9,"moon_illumination":37,"moon_separation":129.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.25,"best_label":"good","best_window":"20:45\u201302:00","dark_hours":8.98,"date":"2043-09-27","moon_free_dark_hours":5.15,"moon_illumination":27,"moon_separation":133.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.25,"best_label":"good","best_window":"20:45\u201302:00","dark_hours":9.03,"date":"2043-09-28","moon_free_dark_hours":6.38,"moon_illumination":18,"moon_separation":133.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.25,"best_label":"good","best_window":"20:40\u201301:55","dark_hours":9.08,"date":"2043-09-29","moon_free_dark_hours":7.6,"moon_illumination":10,"moon_separation":131.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.25,"best_label":"good","best_window":"20:40\u201301:55","dark_hours":9.13,"date":"2043-09-30","moon_free_dark_hours":8.77,"moon_illumination":5,"moon_separation":126.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.17,"best_label":"good","best_window":"20:40\u201301:50","dark_hours":9.17,"date":"2043-10-01","moon_free_dark_hours":9.17,"moon_illumination":2,"moon_separation":120.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.17,"best_label":"good","best_window":"20:35\u201301:45","dark_hours":9.22,"date":"2043-10-02","moon_free_dark_hours":9.22,"moon_illumination":0,"moon_separation":113.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.08,"best_label":"good","best_window":"20:35\u201301:40","dark_hours":9.27,"date":"2043-10-03","moon_free_dark_hours":9.25,"moon_illumination":1,"moon_separation":105.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.0,"best_label":"good","best_window":"20:35\u201301:35","dark_hours":9.32,"date":"2043-10-04","moon_free_dark_hours":9.3,"moon_illumination":3,"moon_separation":97.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.08,"best_label":"good","best_window":"20:30\u201301:35","dark_hours":9.36,"date":"2043-10-05","moon_free_dark_hours":9.35,"moon_illumination":7,"moon_separation":88.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:25","verdict":"unknown","weather_source":"none","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":"2043-09-06","target":{"dec":22.71085365,"name":"HD 189733","ra":300.18213726,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD%20189733","source":"sesame","spectral_type":"K2V","type":"BY*","type_text":"BY Draconis variable \u2014 a spotted, rotating star","vmag":7.648}}