{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":5.67,"best_label":"good","best_window":"21:05\u201302:45","dark_hours":8.45,"date":"2028-09-16","moon_free_dark_hours":8.25,"moon_illumination":5,"moon_separation":137.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.58,"best_label":"good","best_window":"21:05\u201302:40","dark_hours":8.5,"date":"2028-09-17","moon_free_dark_hours":8.48,"moon_illumination":1,"moon_separation":130.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.58,"best_label":"good","best_window":"21:00\u201302:35","dark_hours":8.56,"date":"2028-09-18","moon_free_dark_hours":8.53,"moon_illumination":0,"moon_separation":121.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.58,"best_label":"good","best_window":"21:00\u201302:35","dark_hours":8.61,"date":"2028-09-19","moon_free_dark_hours":8.6,"moon_illumination":2,"moon_separation":111.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.58,"best_label":"good","best_window":"20:55\u201302:30","dark_hours":8.66,"date":"2028-09-20","moon_free_dark_hours":8.65,"moon_illumination":7,"moon_separation":100.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.5,"best_label":"good","best_window":"20:55\u201302:25","dark_hours":8.71,"date":"2028-09-21","moon_free_dark_hours":8.7,"moon_illumination":14,"moon_separation":89.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.42,"best_label":"good","best_window":"20:55\u201302:20","dark_hours":8.76,"date":"2028-09-22","moon_free_dark_hours":8.52,"moon_illumination":23,"moon_separation":78.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.42,"best_label":"good","best_window":"20:50\u201302:15","dark_hours":8.81,"date":"2028-09-23","moon_free_dark_hours":7.72,"moon_illumination":33,"moon_separation":68.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.42,"best_label":"good","best_window":"20:50\u201302:15","dark_hours":8.86,"date":"2028-09-24","moon_free_dark_hours":6.82,"moon_illumination":44,"moon_separation":59.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.33,"best_label":"good","best_window":"20:50\u201302:10","dark_hours":8.91,"date":"2028-09-25","moon_free_dark_hours":5.85,"moon_illumination":54,"moon_separation":51.5,"score":null,"score_astronomy":94,"score_weather":null,"transit_alt":71.1,"transit_local":"21:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.33,"best_label":"good","best_window":"20:45\u201302:05","dark_hours":8.96,"date":"2028-09-26","moon_free_dark_hours":4.8,"moon_illumination":64,"moon_separation":45.3,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":71.1,"transit_local":"21:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.58,"best_label":"good","best_window":"20:45\u201300:20","dark_hours":9.01,"date":"2028-09-27","moon_free_dark_hours":3.77,"moon_illumination":73,"moon_separation":41.5,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"20:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.67,"best_label":"marginal","best_window":"20:40\u201302:20","dark_hours":9.06,"date":"2028-09-28","moon_free_dark_hours":2.73,"moon_illumination":81,"moon_separation":40.4,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"20:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.42,"best_label":"marginal","best_window":"20:40\u201302:05","dark_hours":9.11,"date":"2028-09-29","moon_free_dark_hours":1.73,"moon_illumination":88,"moon_separation":42.2,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":71.1,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.17,"best_label":"marginal","best_window":"20:40\u201301:50","dark_hours":9.16,"date":"2028-09-30","moon_free_dark_hours":0.75,"moon_illumination":93,"moon_separation":46.5,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"20:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.17,"best_label":"marginal","best_window":"20:35\u201301:45","dark_hours":9.2,"date":"2028-10-01","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":52.7,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":71.1,"transit_local":"20:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.08,"best_label":"marginal","best_window":"20:35\u201301:40","dark_hours":9.25,"date":"2028-10-02","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":60.1,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"20:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.92,"best_label":"good","best_window":"20:35\u201321:30","dark_hours":9.3,"date":"2028-10-03","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":68.3,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":71.1,"transit_local":"20:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.33,"best_label":"good","best_window":"20:30\u201322:50","dark_hours":9.35,"date":"2028-10-04","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":77.1,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":71.1,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.33,"best_label":"good","best_window":"20:30\u201323:50","dark_hours":9.39,"date":"2028-10-05","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":86.3,"score":null,"score_astronomy":70,"score_weather":null,"transit_alt":71.1,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.25,"best_label":"good","best_window":"20:30\u201300:45","dark_hours":9.44,"date":"2028-10-06","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":95.6,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":71.1,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.58,"best_label":"good","best_window":"20:25\u201301:00","dark_hours":9.49,"date":"2028-10-07","moon_free_dark_hours":0.18,"moon_illumination":84,"moon_separation":104.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.67,"best_label":"good","best_window":"20:25\u201301:05","dark_hours":9.53,"date":"2028-10-08","moon_free_dark_hours":0.98,"moon_illumination":76,"moon_separation":114.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.67,"best_label":"good","best_window":"20:25\u201301:05","dark_hours":9.58,"date":"2028-10-09","moon_free_dark_hours":1.9,"moon_illumination":66,"moon_separation":122.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.75,"best_label":"good","best_window":"20:20\u201301:05","dark_hours":9.62,"date":"2028-10-10","moon_free_dark_hours":2.98,"moon_illumination":56,"moon_separation":130.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.75,"best_label":"good","best_window":"20:20\u201301:05","dark_hours":9.67,"date":"2028-10-11","moon_free_dark_hours":4.15,"moon_illumination":45,"moon_separation":136.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.67,"best_label":"good","best_window":"20:20\u201301:00","dark_hours":9.71,"date":"2028-10-12","moon_free_dark_hours":5.38,"moon_illumination":34,"moon_separation":139.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.75,"best_label":"good","best_window":"20:15\u201301:00","dark_hours":9.76,"date":"2028-10-13","moon_free_dark_hours":6.65,"moon_illumination":24,"moon_separation":138.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.67,"best_label":"good","best_window":"20:15\u201300:55","dark_hours":9.8,"date":"2028-10-14","moon_free_dark_hours":7.93,"moon_illumination":15,"moon_separation":134.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.58,"best_label":"good","best_window":"20:15\u201300:50","dark_hours":9.84,"date":"2028-10-15","moon_free_dark_hours":9.23,"moon_illumination":7,"moon_separation":126.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":71.1,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2028-09-16","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}}