{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.25,"best_label":"marginal","best_window":"05:00\u201306:15","dark_hours":10.17,"date":"2039-02-17","moon_free_dark_hours":8.2,"moon_illumination":30,"moon_separation":58.4,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":71.1,"transit_local":"10:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"good","best_window":"05:30\u201305:40","dark_hours":10.13,"date":"2039-02-18","moon_free_dark_hours":9.25,"moon_illumination":20,"moon_separation":51.5,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.33,"best_label":"good","best_window":"05:20\u201305:40","dark_hours":10.09,"date":"2039-02-19","moon_free_dark_hours":10.08,"moon_illumination":12,"moon_separation":46.9,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":71.1,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.33,"best_label":"good","best_window":"05:20\u201305:40","dark_hours":10.05,"date":"2039-02-20","moon_free_dark_hours":10.03,"moon_illumination":6,"moon_separation":45.3,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":71.1,"transit_local":"10:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.33,"best_label":"good","best_window":"05:15\u201305:35","dark_hours":10.01,"date":"2039-02-21","moon_free_dark_hours":9.98,"moon_illumination":2,"moon_separation":46.8,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":71.1,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"good","best_window":"05:10\u201305:35","dark_hours":9.96,"date":"2039-02-22","moon_free_dark_hours":9.95,"moon_illumination":0,"moon_separation":51.1,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":71.1,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.5,"best_label":"good","best_window":"05:05\u201305:35","dark_hours":9.92,"date":"2039-02-23","moon_free_dark_hours":9.9,"moon_illumination":1,"moon_separation":57.4,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":71.1,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.58,"best_label":"good","best_window":"05:00\u201305:35","dark_hours":9.88,"date":"2039-02-24","moon_free_dark_hours":9.87,"moon_illumination":4,"moon_separation":64.9,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":71.1,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.5,"best_label":"good","best_window":"05:00\u201305:30","dark_hours":9.83,"date":"2039-02-25","moon_free_dark_hours":9.0,"moon_illumination":8,"moon_separation":73.0,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":71.1,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.58,"best_label":"good","best_window":"04:55\u201305:30","dark_hours":9.79,"date":"2039-02-26","moon_free_dark_hours":7.97,"moon_illumination":14,"moon_separation":81.4,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":71.1,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.67,"best_label":"good","best_window":"04:50\u201305:30","dark_hours":9.74,"date":"2039-02-27","moon_free_dark_hours":6.92,"moon_illumination":22,"moon_separation":89.9,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.67,"best_label":"good","best_window":"04:45\u201305:25","dark_hours":9.7,"date":"2039-02-28","moon_free_dark_hours":5.9,"moon_illumination":30,"moon_separation":98.3,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"04:40\u201305:25","dark_hours":9.65,"date":"2039-03-01","moon_free_dark_hours":4.87,"moon_illumination":39,"moon_separation":106.4,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":71.1,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.75,"best_label":"good","best_window":"04:40\u201305:25","dark_hours":9.61,"date":"2039-03-02","moon_free_dark_hours":3.87,"moon_illumination":48,"moon_separation":114.1,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.75,"best_label":"good","best_window":"04:35\u201305:20","dark_hours":9.56,"date":"2039-03-03","moon_free_dark_hours":2.87,"moon_illumination":58,"moon_separation":121.2,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.83,"best_label":"good","best_window":"04:30\u201305:20","dark_hours":9.52,"date":"2039-03-04","moon_free_dark_hours":1.9,"moon_illumination":67,"moon_separation":127.3,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":71.1,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.92,"best_label":"good","best_window":"04:25\u201305:20","dark_hours":9.47,"date":"2039-03-05","moon_free_dark_hours":1.02,"moon_illumination":76,"moon_separation":131.9,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":71.1,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.75,"best_label":"good","best_window":"04:30\u201305:15","dark_hours":9.42,"date":"2039-03-06","moon_free_dark_hours":0.22,"moon_illumination":84,"moon_separation":134.4,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":71.1,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.83,"best_label":"good","best_window":"04:25\u201305:15","dark_hours":9.38,"date":"2039-03-07","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":134.2,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":71.1,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.83,"best_label":"good","best_window":"04:25\u201305:15","dark_hours":9.33,"date":"2039-03-08","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":131.1,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":71.1,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.83,"best_label":"good","best_window":"04:20\u201305:10","dark_hours":9.28,"date":"2039-03-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":125.4,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":71.1,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.83,"best_label":"good","best_window":"04:20\u201305:10","dark_hours":9.23,"date":"2039-03-10","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":117.8,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":71.1,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.83,"best_label":"good","best_window":"04:20\u201305:10","dark_hours":9.18,"date":"2039-03-11","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":108.8,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.67,"best_label":"good","best_window":"04:25\u201305:05","dark_hours":9.13,"date":"2039-03-12","moon_free_dark_hours":0.7,"moon_illumination":93,"moon_separation":99.0,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":71.1,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.58,"best_label":"good","best_window":"04:30\u201305:05","dark_hours":9.08,"date":"2039-03-13","moon_free_dark_hours":1.92,"moon_illumination":86,"moon_separation":88.8,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.58,"best_label":"good","best_window":"04:30\u201305:05","dark_hours":9.03,"date":"2039-03-14","moon_free_dark_hours":3.15,"moon_illumination":77,"moon_separation":78.7,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"04:15\u201305:00","dark_hours":8.98,"date":"2039-03-15","moon_free_dark_hours":4.37,"moon_illumination":67,"moon_separation":69.1,"score":null,"score_astronomy":18,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.92,"best_label":"good","best_window":"04:05\u201305:00","dark_hours":8.93,"date":"2039-03-16","moon_free_dark_hours":5.55,"moon_illumination":56,"moon_separation":60.4,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.08,"best_label":"good","best_window":"03:55\u201305:00","dark_hours":8.88,"date":"2039-03-17","moon_free_dark_hours":6.65,"moon_illumination":44,"moon_separation":53.1,"score":null,"score_astronomy":24,"score_weather":null,"transit_alt":71.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"03:45\u201304:55","dark_hours":8.83,"date":"2039-03-18","moon_free_dark_hours":7.6,"moon_illumination":33,"moon_separation":48.0,"score":null,"score_astronomy":27,"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":"2039-02-17","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}}
