{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.92,"best_label":"good","best_window":"18:40\u201321:35","dark_hours":11.04,"date":"2027-11-18","moon_free_dark_hours":2.58,"moon_illumination":73,"moon_separation":136.3,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":71.1,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.0,"best_label":"good","best_window":"18:35\u201321:35","dark_hours":11.06,"date":"2027-11-19","moon_free_dark_hours":3.87,"moon_illumination":63,"moon_separation":138.4,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":71.1,"transit_local":"16:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"good","best_window":"18:35\u201321:30","dark_hours":11.09,"date":"2027-11-20","moon_free_dark_hours":5.1,"moon_illumination":51,"moon_separation":136.6,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":71.1,"transit_local":"16:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.92,"best_label":"good","best_window":"18:35\u201321:30","dark_hours":11.11,"date":"2027-11-21","moon_free_dark_hours":6.33,"moon_illumination":40,"moon_separation":131.4,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":71.1,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.83,"best_label":"good","best_window":"18:35\u201321:25","dark_hours":11.14,"date":"2027-11-22","moon_free_dark_hours":7.53,"moon_illumination":29,"moon_separation":123.9,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":71.1,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.75,"best_label":"good","best_window":"18:35\u201321:20","dark_hours":11.16,"date":"2027-11-23","moon_free_dark_hours":8.73,"moon_illumination":20,"moon_separation":115.0,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"16:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.67,"best_label":"good","best_window":"18:35\u201321:15","dark_hours":11.19,"date":"2027-11-24","moon_free_dark_hours":9.93,"moon_illumination":12,"moon_separation":105.3,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":71.1,"transit_local":"16:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.58,"best_label":"good","best_window":"18:35\u201321:10","dark_hours":11.21,"date":"2027-11-25","moon_free_dark_hours":11.13,"moon_illumination":6,"moon_separation":95.3,"score":null,"score_astronomy":68,"score_weather":null,"transit_alt":71.1,"transit_local":"16:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.58,"best_label":"good","best_window":"18:35\u201321:10","dark_hours":11.23,"date":"2027-11-26","moon_free_dark_hours":11.22,"moon_illumination":2,"moon_separation":85.3,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.5,"best_label":"good","best_window":"18:35\u201321:05","dark_hours":11.25,"date":"2027-11-27","moon_free_dark_hours":11.23,"moon_illumination":0,"moon_separation":75.6,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"18:35\u201321:00","dark_hours":11.27,"date":"2027-11-28","moon_free_dark_hours":11.25,"moon_illumination":1,"moon_separation":66.4,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":71.1,"transit_local":"15:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.33,"best_label":"good","best_window":"18:35\u201320:55","dark_hours":11.29,"date":"2027-11-29","moon_free_dark_hours":11.28,"moon_illumination":3,"moon_separation":58.1,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":71.1,"transit_local":"15:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"18:35\u201320:50","dark_hours":11.31,"date":"2027-11-30","moon_free_dark_hours":11.28,"moon_illumination":8,"moon_separation":50.9,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":71.1,"transit_local":"15:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.25,"best_label":"good","best_window":"18:35\u201320:50","dark_hours":11.33,"date":"2027-12-01","moon_free_dark_hours":10.27,"moon_illumination":14,"moon_separation":45.5,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":71.1,"transit_local":"15:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.17,"best_label":"good","best_window":"18:35\u201320:45","dark_hours":11.34,"date":"2027-12-02","moon_free_dark_hours":9.22,"moon_illumination":21,"moon_separation":42.2,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":71.1,"transit_local":"15:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.92,"best_label":"good","best_window":"18:35\u201320:30","dark_hours":11.36,"date":"2027-12-03","moon_free_dark_hours":8.18,"moon_illumination":29,"moon_separation":41.6,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"15:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"18:35\u201320:20","dark_hours":11.38,"date":"2027-12-04","moon_free_dark_hours":7.18,"moon_illumination":38,"moon_separation":43.7,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"15:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.5,"best_label":"good","best_window":"18:35\u201320:05","dark_hours":11.39,"date":"2027-12-05","moon_free_dark_hours":6.18,"moon_illumination":47,"moon_separation":48.2,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":71.1,"transit_local":"15:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.58,"best_label":"good","best_window":"18:35\u201319:10","dark_hours":11.4,"date":"2027-12-06","moon_free_dark_hours":5.2,"moon_illumination":57,"moon_separation":54.4,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"15:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.75,"best_label":"marginal","best_window":"18:00\u201320:45","dark_hours":11.42,"date":"2027-12-07","moon_free_dark_hours":4.18,"moon_illumination":66,"moon_separation":62.0,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"15:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"marginal","best_window":"18:35\u201320:40","dark_hours":11.43,"date":"2027-12-08","moon_free_dark_hours":3.12,"moon_illumination":75,"moon_separation":70.6,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":71.1,"transit_local":"15:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.58,"best_label":"marginal","best_window":"18:00\u201320:35","dark_hours":11.44,"date":"2027-12-09","moon_free_dark_hours":2.02,"moon_illumination":83,"moon_separation":79.9,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":71.1,"transit_local":"15:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.42,"best_label":"good","best_window":"18:35\u201319:00","dark_hours":11.45,"date":"2027-12-10","moon_free_dark_hours":0.87,"moon_illumination":90,"moon_separation":89.8,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":71.1,"transit_local":"15:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.0,"best_label":"good","best_window":"18:35\u201319:35","dark_hours":11.46,"date":"2027-12-11","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":99.9,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"15:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.17,"best_label":"good","best_window":"18:35\u201319:45","dark_hours":11.47,"date":"2027-12-12","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":110.1,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":71.1,"transit_local":"15:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.25,"best_label":"good","best_window":"18:35\u201319:50","dark_hours":11.48,"date":"2027-12-13","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":119.9,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"14:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.25,"best_label":"good","best_window":"18:35\u201319:50","dark_hours":11.48,"date":"2027-12-14","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":128.5,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"14:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.17,"best_label":"good","best_window":"18:35\u201319:45","dark_hours":11.49,"date":"2027-12-15","moon_free_dark_hours":0.37,"moon_illumination":93,"moon_separation":135.1,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"14:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.25,"best_label":"good","best_window":"18:35\u201319:50","dark_hours":11.5,"date":"2027-12-16","moon_free_dark_hours":1.67,"moon_illumination":86,"moon_separation":138.3,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"14:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"18:35\u201319:45","dark_hours":11.5,"date":"2027-12-17","moon_free_dark_hours":2.95,"moon_illumination":77,"moon_separation":137.5,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"14:40","verdict":"unknown","weather_source":"none","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":"2027-11-18","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}}