{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":4.92,"best_label":"good","best_window":"20:30\u201301:25","dark_hours":9.36,"date":"2031-10-05","moon_free_dark_hours":1.52,"moon_illumination":73,"moon_separation":117.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.83,"best_label":"good","best_window":"20:30\u201301:20","dark_hours":9.41,"date":"2031-10-06","moon_free_dark_hours":2.37,"moon_illumination":64,"moon_separation":125.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.83,"best_label":"good","best_window":"20:30\u201301:20","dark_hours":9.45,"date":"2031-10-07","moon_free_dark_hours":3.28,"moon_illumination":55,"moon_separation":133.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.83,"best_label":"good","best_window":"20:25\u201301:15","dark_hours":9.5,"date":"2031-10-08","moon_free_dark_hours":4.23,"moon_illumination":46,"moon_separation":139.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.83,"best_label":"good","best_window":"20:25\u201301:15","dark_hours":9.54,"date":"2031-10-09","moon_free_dark_hours":5.18,"moon_illumination":36,"moon_separation":142.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.83,"best_label":"good","best_window":"20:25\u201301:15","dark_hours":9.59,"date":"2031-10-10","moon_free_dark_hours":6.18,"moon_illumination":27,"moon_separation":142.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.83,"best_label":"good","best_window":"20:20\u201301:10","dark_hours":9.64,"date":"2031-10-11","moon_free_dark_hours":7.18,"moon_illumination":19,"moon_separation":139.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.75,"best_label":"good","best_window":"20:20\u201301:05","dark_hours":9.68,"date":"2031-10-12","moon_free_dark_hours":8.2,"moon_illumination":12,"moon_separation":134.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.67,"best_label":"good","best_window":"20:20\u201301:00","dark_hours":9.72,"date":"2031-10-13","moon_free_dark_hours":9.25,"moon_illumination":6,"moon_separation":126.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.67,"best_label":"good","best_window":"20:15\u201300:55","dark_hours":9.77,"date":"2031-10-14","moon_free_dark_hours":9.75,"moon_illumination":2,"moon_separation":117.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.67,"best_label":"good","best_window":"20:15\u201300:55","dark_hours":9.81,"date":"2031-10-15","moon_free_dark_hours":9.8,"moon_illumination":0,"moon_separation":107.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.58,"best_label":"good","best_window":"20:15\u201300:50","dark_hours":9.86,"date":"2031-10-16","moon_free_dark_hours":9.83,"moon_illumination":0,"moon_separation":97.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.58,"best_label":"good","best_window":"20:10\u201300:45","dark_hours":9.9,"date":"2031-10-17","moon_free_dark_hours":9.88,"moon_illumination":3,"moon_separation":86.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.5,"best_label":"good","best_window":"20:10\u201300:40","dark_hours":9.94,"date":"2031-10-18","moon_free_dark_hours":9.92,"moon_illumination":8,"moon_separation":75.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.5,"best_label":"good","best_window":"20:10\u201300:40","dark_hours":9.98,"date":"2031-10-19","moon_free_dark_hours":9.45,"moon_illumination":15,"moon_separation":64.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.42,"best_label":"good","best_window":"20:10\u201300:35","dark_hours":10.02,"date":"2031-10-20","moon_free_dark_hours":8.52,"moon_illumination":24,"moon_separation":54.7,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":71.1,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.42,"best_label":"good","best_window":"20:05\u201300:30","dark_hours":10.07,"date":"2031-10-21","moon_free_dark_hours":7.48,"moon_illumination":34,"moon_separation":46.0,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":71.1,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.33,"best_label":"good","best_window":"20:05\u201300:25","dark_hours":10.11,"date":"2031-10-22","moon_free_dark_hours":6.37,"moon_illumination":46,"moon_separation":39.6,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":71.1,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.75,"best_label":"good","best_window":"20:05\u201323:50","dark_hours":10.15,"date":"2031-10-23","moon_free_dark_hours":5.23,"moon_illumination":57,"moon_separation":37.0,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":71.1,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.67,"best_label":"marginal","best_window":"20:00\u201300:40","dark_hours":10.19,"date":"2031-10-24","moon_free_dark_hours":4.08,"moon_illumination":68,"moon_separation":38.9,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"19:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.5,"best_label":"marginal","best_window":"20:00\u201300:30","dark_hours":10.23,"date":"2031-10-25","moon_free_dark_hours":2.95,"moon_illumination":78,"moon_separation":44.6,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"19:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.25,"best_label":"marginal","best_window":"19:00\u201323:15","dark_hours":10.27,"date":"2031-10-26","moon_free_dark_hours":1.82,"moon_illumination":87,"moon_separation":52.9,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"18:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.17,"best_label":"marginal","best_window":"19:00\u201323:10","dark_hours":10.31,"date":"2031-10-27","moon_free_dark_hours":0.7,"moon_illumination":93,"moon_separation":62.6,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"18:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.08,"best_label":"good","best_window":"18:55\u201320:00","dark_hours":10.34,"date":"2031-10-28","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":72.9,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"17:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.92,"best_label":"good","best_window":"18:55\u201320:50","dark_hours":10.38,"date":"2031-10-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":83.5,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.83,"best_label":"good","best_window":"18:55\u201321:45","dark_hours":10.42,"date":"2031-10-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":94.0,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"17:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.5,"best_label":"good","best_window":"18:55\u201322:25","dark_hours":10.46,"date":"2031-10-31","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":104.3,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"17:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.58,"best_label":"good","best_window":"18:55\u201322:30","dark_hours":10.49,"date":"2031-11-01","moon_free_dark_hours":0.02,"moon_illumination":93,"moon_separation":114.0,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":71.1,"transit_local":"17:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.75,"best_label":"good","best_window":"18:50\u201322:35","dark_hours":10.53,"date":"2031-11-02","moon_free_dark_hours":0.87,"moon_illumination":87,"moon_separation":123.0,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.67,"best_label":"good","best_window":"18:50\u201322:30","dark_hours":10.57,"date":"2031-11-03","moon_free_dark_hours":1.75,"moon_illumination":80,"moon_separation":130.9,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"17:30","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":"2031-10-05","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}}