{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.75,"best_label":"good","best_window":"04:35\u201305:20","dark_hours":9.47,"date":"2043-03-05","moon_free_dark_hours":8.3,"moon_illumination":32,"moon_separation":55.7,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.83,"best_label":"good","best_window":"04:25\u201305:15","dark_hours":9.42,"date":"2043-03-06","moon_free_dark_hours":9.05,"moon_illumination":23,"moon_separation":50.5,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.92,"best_label":"good","best_window":"04:20\u201305:15","dark_hours":9.37,"date":"2043-03-07","moon_free_dark_hours":9.35,"moon_illumination":15,"moon_separation":47.3,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":71.1,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.0,"best_label":"good","best_window":"04:15\u201305:15","dark_hours":9.33,"date":"2043-03-08","moon_free_dark_hours":9.32,"moon_illumination":8,"moon_separation":46.8,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.0,"best_label":"good","best_window":"04:10\u201305:10","dark_hours":9.28,"date":"2043-03-09","moon_free_dark_hours":9.27,"moon_illumination":3,"moon_separation":49.4,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.08,"best_label":"good","best_window":"04:05\u201305:10","dark_hours":9.23,"date":"2043-03-10","moon_free_dark_hours":9.2,"moon_illumination":0,"moon_separation":54.7,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.08,"best_label":"good","best_window":"04:05\u201305:10","dark_hours":9.18,"date":"2043-03-11","moon_free_dark_hours":9.17,"moon_illumination":0,"moon_separation":62.3,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.08,"best_label":"good","best_window":"04:00\u201305:05","dark_hours":9.13,"date":"2043-03-12","moon_free_dark_hours":9.12,"moon_illumination":3,"moon_separation":71.3,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"03:55\u201305:05","dark_hours":9.08,"date":"2043-03-13","moon_free_dark_hours":7.92,"moon_illumination":9,"moon_separation":81.1,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.25,"best_label":"good","best_window":"03:50\u201305:05","dark_hours":9.03,"date":"2043-03-14","moon_free_dark_hours":6.55,"moon_illumination":17,"moon_separation":91.1,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.25,"best_label":"good","best_window":"03:45\u201305:00","dark_hours":8.98,"date":"2043-03-15","moon_free_dark_hours":5.2,"moon_illumination":27,"moon_separation":101.0,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.25,"best_label":"good","best_window":"03:45\u201305:00","dark_hours":8.93,"date":"2043-03-16","moon_free_dark_hours":3.88,"moon_illumination":38,"moon_separation":110.3,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.33,"best_label":"good","best_window":"03:40\u201305:00","dark_hours":8.88,"date":"2043-03-17","moon_free_dark_hours":2.68,"moon_illumination":49,"moon_separation":118.7,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":71.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.33,"best_label":"good","best_window":"03:35\u201304:55","dark_hours":8.83,"date":"2043-03-18","moon_free_dark_hours":1.67,"moon_illumination":60,"moon_separation":125.6,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.33,"best_label":"good","best_window":"03:35\u201304:55","dark_hours":8.78,"date":"2043-03-19","moon_free_dark_hours":0.85,"moon_illumination":70,"moon_separation":130.6,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.25,"best_label":"good","best_window":"03:35\u201304:50","dark_hours":8.73,"date":"2043-03-20","moon_free_dark_hours":0.22,"moon_illumination":79,"moon_separation":133.1,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.33,"best_label":"good","best_window":"03:30\u201304:50","dark_hours":8.68,"date":"2043-03-21","moon_free_dark_hours":0.0,"moon_illumination":87,"moon_separation":132.8,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.33,"best_label":"good","best_window":"03:30\u201304:50","dark_hours":8.62,"date":"2043-03-22","moon_free_dark_hours":0.0,"moon_illumination":93,"moon_separation":130.0,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.33,"best_label":"good","best_window":"03:25\u201304:45","dark_hours":8.57,"date":"2043-03-23","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":125.2,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.33,"best_label":"good","best_window":"03:25\u201304:45","dark_hours":8.52,"date":"2043-03-24","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":118.9,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.33,"best_label":"good","best_window":"03:25\u201304:45","dark_hours":8.47,"date":"2043-03-25","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":111.7,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.25,"best_label":"good","best_window":"03:25\u201304:40","dark_hours":8.41,"date":"2043-03-26","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":103.9,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.25,"best_label":"good","best_window":"03:25\u201304:40","dark_hours":8.36,"date":"2043-03-27","moon_free_dark_hours":0.55,"moon_illumination":95,"moon_separation":95.9,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.08,"best_label":"good","best_window":"04:30\u201305:35","dark_hours":8.31,"date":"2043-03-28","moon_free_dark_hours":1.6,"moon_illumination":90,"moon_separation":87.7,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.08,"best_label":"good","best_window":"04:30\u201305:35","dark_hours":8.25,"date":"2043-03-29","moon_free_dark_hours":2.65,"moon_illumination":84,"moon_separation":79.7,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.25,"best_label":"good","best_window":"04:20\u201305:35","dark_hours":8.2,"date":"2043-03-30","moon_free_dark_hours":3.68,"moon_illumination":76,"moon_separation":71.9,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.33,"best_label":"good","best_window":"04:10\u201305:30","dark_hours":8.14,"date":"2043-03-31","moon_free_dark_hours":4.68,"moon_illumination":68,"moon_separation":64.5,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":71.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.5,"best_label":"good","best_window":"04:00\u201305:30","dark_hours":8.09,"date":"2043-04-01","moon_free_dark_hours":5.6,"moon_illumination":58,"moon_separation":57.8,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":71.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.92,"best_label":"good","best_window":"03:35\u201305:30","dark_hours":8.03,"date":"2043-04-02","moon_free_dark_hours":6.37,"moon_illumination":49,"moon_separation":52.2,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.83,"best_label":"good","best_window":"03:35\u201305:25","dark_hours":7.98,"date":"2043-04-03","moon_free_dark_hours":7.03,"moon_illumination":38,"moon_separation":48.3,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"08:35","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":"2043-03-05","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}}