{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":3.42,"best_label":"good","best_window":"18:45\u201322:10","dark_hours":10.8,"date":"2031-11-10","moon_free_dark_hours":8.58,"moon_illumination":17,"moon_separation":121.3,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":71.1,"transit_local":"17:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.33,"best_label":"good","best_window":"18:45\u201322:05","dark_hours":10.83,"date":"2031-11-11","moon_free_dark_hours":9.67,"moon_illumination":10,"moon_separation":111.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":71.1,"transit_local":"17:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.42,"best_label":"good","best_window":"18:40\u201322:05","dark_hours":10.86,"date":"2031-11-12","moon_free_dark_hours":10.78,"moon_illumination":5,"moon_separation":101.4,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":71.1,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.33,"best_label":"good","best_window":"18:40\u201322:00","dark_hours":10.89,"date":"2031-11-13","moon_free_dark_hours":10.88,"moon_illumination":1,"moon_separation":90.5,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":71.1,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.25,"best_label":"good","best_window":"18:40\u201321:55","dark_hours":10.92,"date":"2031-11-14","moon_free_dark_hours":10.92,"moon_illumination":0,"moon_separation":79.4,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":71.1,"transit_local":"16:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.17,"best_label":"good","best_window":"18:40\u201321:50","dark_hours":10.95,"date":"2031-11-15","moon_free_dark_hours":10.93,"moon_illumination":1,"moon_separation":68.3,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":71.1,"transit_local":"16:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.08,"best_label":"good","best_window":"18:40\u201321:45","dark_hours":10.98,"date":"2031-11-16","moon_free_dark_hours":10.97,"moon_illumination":6,"moon_separation":57.6,"score":null,"score_astronomy":82,"score_weather":null,"transit_alt":71.1,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.08,"best_label":"good","best_window":"18:40\u201321:45","dark_hours":11.01,"date":"2031-11-17","moon_free_dark_hours":10.13,"moon_illumination":12,"moon_separation":48.2,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":71.1,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.0,"best_label":"good","best_window":"18:40\u201321:40","dark_hours":11.04,"date":"2031-11-18","moon_free_dark_hours":9.02,"moon_illumination":21,"moon_separation":40.9,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"18:35\u201321:25","dark_hours":11.06,"date":"2031-11-19","moon_free_dark_hours":7.85,"moon_illumination":31,"moon_separation":37.2,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"16:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.58,"best_label":"good","best_window":"18:35\u201321:10","dark_hours":11.09,"date":"2031-11-20","moon_free_dark_hours":6.7,"moon_illumination":42,"moon_separation":38.1,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"16:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.67,"best_label":"good","best_window":"18:35\u201320:15","dark_hours":11.11,"date":"2031-11-21","moon_free_dark_hours":5.55,"moon_illumination":54,"moon_separation":43.1,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.5,"best_label":"good","best_window":"18:35\u201319:05","dark_hours":11.14,"date":"2031-11-22","moon_free_dark_hours":4.43,"moon_illumination":64,"moon_separation":50.8,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"good","best_window":"18:35\u201318:40","dark_hours":11.16,"date":"2031-11-23","moon_free_dark_hours":3.33,"moon_illumination":75,"moon_separation":60.0,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"16:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"good","best_window":"18:35\u201318:45","dark_hours":11.19,"date":"2031-11-24","moon_free_dark_hours":2.25,"moon_illumination":83,"moon_separation":70.1,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"16:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.67,"best_label":"good","best_window":"18:35\u201319:15","dark_hours":11.21,"date":"2031-11-25","moon_free_dark_hours":1.18,"moon_illumination":90,"moon_separation":80.4,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"16:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.25,"best_label":"good","best_window":"18:35\u201319:50","dark_hours":11.23,"date":"2031-11-26","moon_free_dark_hours":0.15,"moon_illumination":96,"moon_separation":90.8,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.0,"best_label":"good","best_window":"18:35\u201320:35","dark_hours":11.25,"date":"2031-11-27","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":101.0,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":71.1,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.08,"best_label":"good","best_window":"18:35\u201320:40","dark_hours":11.27,"date":"2031-11-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":110.9,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"15:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.17,"best_label":"good","best_window":"18:35\u201320:45","dark_hours":11.29,"date":"2031-11-29","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":120.1,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"15:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.17,"best_label":"good","best_window":"18:35\u201320:45","dark_hours":11.31,"date":"2031-11-30","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":128.5,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"15:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.08,"best_label":"good","best_window":"18:35\u201320:40","dark_hours":11.33,"date":"2031-12-01","moon_free_dark_hours":0.77,"moon_illumination":92,"moon_separation":135.5,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"15:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.08,"best_label":"good","best_window":"18:35\u201320:40","dark_hours":11.34,"date":"2031-12-02","moon_free_dark_hours":1.7,"moon_illumination":86,"moon_separation":140.5,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"15:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"good","best_window":"18:35\u201320:40","dark_hours":11.36,"date":"2031-12-03","moon_free_dark_hours":2.63,"moon_illumination":79,"moon_separation":142.9,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"15:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.0,"best_label":"good","best_window":"18:35\u201320:35","dark_hours":11.38,"date":"2031-12-04","moon_free_dark_hours":3.58,"moon_illumination":70,"moon_separation":142.1,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":71.1,"transit_local":"15:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.0,"best_label":"good","best_window":"18:35\u201320:35","dark_hours":11.39,"date":"2031-12-05","moon_free_dark_hours":4.55,"moon_illumination":62,"moon_separation":138.3,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":71.1,"transit_local":"15:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.92,"best_label":"good","best_window":"18:35\u201320:30","dark_hours":11.4,"date":"2031-12-06","moon_free_dark_hours":5.52,"moon_illumination":52,"moon_separation":132.2,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":71.1,"transit_local":"15:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.83,"best_label":"good","best_window":"18:35\u201320:25","dark_hours":11.42,"date":"2031-12-07","moon_free_dark_hours":6.5,"moon_illumination":42,"moon_separation":124.5,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":71.1,"transit_local":"15:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.75,"best_label":"good","best_window":"18:35\u201320:20","dark_hours":11.43,"date":"2031-12-08","moon_free_dark_hours":7.52,"moon_illumination":33,"moon_separation":115.5,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"15:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.67,"best_label":"good","best_window":"18:35\u201320:15","dark_hours":11.44,"date":"2031-12-09","moon_free_dark_hours":8.58,"moon_illumination":23,"moon_separation":105.7,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"15:10","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2031-11-10","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}}