{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.08,"best_label":"good","best_window":"03:50\u201304:55","dark_hours":8.74,"date":"2044-03-19","moon_free_dark_hours":4.88,"moon_illumination":66,"moon_separation":70.7,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":71.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.08,"best_label":"good","best_window":"03:45\u201304:50","dark_hours":8.69,"date":"2044-03-20","moon_free_dark_hours":5.82,"moon_illumination":57,"moon_separation":63.3,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.25,"best_label":"good","best_window":"03:35\u201304:50","dark_hours":8.64,"date":"2044-03-21","moon_free_dark_hours":6.65,"moon_illumination":48,"moon_separation":56.6,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.5,"best_label":"good","best_window":"03:15\u201304:45","dark_hours":8.58,"date":"2044-03-22","moon_free_dark_hours":7.35,"moon_illumination":38,"moon_separation":51.1,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.5,"best_label":"good","best_window":"03:15\u201304:45","dark_hours":8.53,"date":"2044-03-23","moon_free_dark_hours":7.9,"moon_illumination":29,"moon_separation":47.2,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.58,"best_label":"good","best_window":"03:10\u201304:45","dark_hours":8.48,"date":"2044-03-24","moon_free_dark_hours":8.37,"moon_illumination":21,"moon_separation":45.6,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.58,"best_label":"good","best_window":"03:05\u201304:40","dark_hours":8.43,"date":"2044-03-25","moon_free_dark_hours":8.42,"moon_illumination":13,"moon_separation":46.5,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.67,"best_label":"good","best_window":"04:00\u201305:40","dark_hours":8.37,"date":"2044-03-26","moon_free_dark_hours":8.37,"moon_illumination":7,"moon_separation":50.0,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":71.1,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.75,"best_label":"good","best_window":"03:55\u201305:40","dark_hours":8.32,"date":"2044-03-27","moon_free_dark_hours":8.3,"moon_illumination":3,"moon_separation":55.9,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":71.1,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.67,"best_label":"good","best_window":"03:55\u201305:35","dark_hours":8.27,"date":"2044-03-28","moon_free_dark_hours":8.25,"moon_illumination":0,"moon_separation":63.5,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.75,"best_label":"good","best_window":"03:50\u201305:35","dark_hours":8.21,"date":"2044-03-29","moon_free_dark_hours":8.2,"moon_illumination":0,"moon_separation":72.3,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.75,"best_label":"good","best_window":"03:45\u201305:30","dark_hours":8.16,"date":"2044-03-30","moon_free_dark_hours":8.13,"moon_illumination":3,"moon_separation":82.0,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.83,"best_label":"good","best_window":"03:40\u201305:30","dark_hours":8.1,"date":"2044-03-31","moon_free_dark_hours":6.93,"moon_illumination":8,"moon_separation":92.0,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":71.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.92,"best_label":"good","best_window":"03:35\u201305:30","dark_hours":8.05,"date":"2044-04-01","moon_free_dark_hours":5.58,"moon_illumination":16,"moon_separation":102.0,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":71.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.83,"best_label":"good","best_window":"03:35\u201305:25","dark_hours":7.99,"date":"2044-04-02","moon_free_dark_hours":4.28,"moon_illumination":25,"moon_separation":111.6,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":71.1,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.92,"best_label":"good","best_window":"03:30\u201305:25","dark_hours":7.94,"date":"2044-04-03","moon_free_dark_hours":3.1,"moon_illumination":36,"moon_separation":120.2,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.92,"best_label":"good","best_window":"03:25\u201305:20","dark_hours":7.88,"date":"2044-04-04","moon_free_dark_hours":2.13,"moon_illumination":47,"moon_separation":127.4,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.92,"best_label":"good","best_window":"03:25\u201305:20","dark_hours":7.83,"date":"2044-04-05","moon_free_dark_hours":1.35,"moon_illumination":59,"moon_separation":132.4,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.92,"best_label":"good","best_window":"03:25\u201305:20","dark_hours":7.77,"date":"2044-04-06","moon_free_dark_hours":0.73,"moon_illumination":70,"moon_separation":134.5,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.92,"best_label":"good","best_window":"03:20\u201305:15","dark_hours":7.71,"date":"2044-04-07","moon_free_dark_hours":0.23,"moon_illumination":79,"moon_separation":133.3,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.92,"best_label":"good","best_window":"03:20\u201305:15","dark_hours":7.66,"date":"2044-04-08","moon_free_dark_hours":0.0,"moon_illumination":87,"moon_separation":129.3,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.0,"best_label":"good","best_window":"03:15\u201305:15","dark_hours":7.6,"date":"2044-04-09","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":123.2,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.92,"best_label":"good","best_window":"03:15\u201305:10","dark_hours":7.54,"date":"2044-04-10","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":115.7,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.92,"best_label":"good","best_window":"03:15\u201305:10","dark_hours":7.49,"date":"2044-04-11","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":107.5,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.75,"best_label":"good","best_window":"03:20\u201305:05","dark_hours":7.43,"date":"2044-04-12","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":98.9,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.67,"best_label":"good","best_window":"03:25\u201305:05","dark_hours":7.37,"date":"2044-04-13","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":90.2,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.33,"best_label":"good","best_window":"03:45\u201305:05","dark_hours":7.31,"date":"2044-04-14","moon_free_dark_hours":0.97,"moon_illumination":94,"moon_separation":81.6,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"03:50\u201305:00","dark_hours":7.26,"date":"2044-04-15","moon_free_dark_hours":2.03,"moon_illumination":88,"moon_separation":73.3,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.33,"best_label":"good","best_window":"03:40\u201305:00","dark_hours":7.2,"date":"2044-04-16","moon_free_dark_hours":3.02,"moon_illumination":81,"moon_separation":65.6,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.75,"best_label":"good","best_window":"03:10\u201304:55","dark_hours":7.14,"date":"2044-04-17","moon_free_dark_hours":3.9,"moon_illumination":73,"moon_separation":58.6,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","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":"2044-03-19","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}}