{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.5,"best_label":"good","best_window":"03:20\u201304:50","dark_hours":8.65,"date":"2045-03-21","moon_free_dark_hours":7.05,"moon_illumination":11,"moon_separation":87.5,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.5,"best_label":"good","best_window":"03:20\u201304:50","dark_hours":8.6,"date":"2045-03-22","moon_free_dark_hours":5.82,"moon_illumination":18,"moon_separation":97.1,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.5,"best_label":"good","best_window":"03:15\u201304:45","dark_hours":8.54,"date":"2045-03-23","moon_free_dark_hours":4.6,"moon_illumination":27,"moon_separation":106.5,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.58,"best_label":"good","best_window":"03:10\u201304:45","dark_hours":8.49,"date":"2045-03-24","moon_free_dark_hours":3.43,"moon_illumination":38,"moon_separation":115.7,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.58,"best_label":"good","best_window":"04:05\u201305:40","dark_hours":8.44,"date":"2045-03-25","moon_free_dark_hours":2.42,"moon_illumination":49,"moon_separation":123.9,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.58,"best_label":"good","best_window":"04:05\u201305:40","dark_hours":8.39,"date":"2045-03-26","moon_free_dark_hours":1.55,"moon_illumination":60,"moon_separation":130.7,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.58,"best_label":"good","best_window":"04:05\u201305:40","dark_hours":8.33,"date":"2045-03-27","moon_free_dark_hours":0.87,"moon_illumination":71,"moon_separation":135.0,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":71.1,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.58,"best_label":"good","best_window":"04:00\u201305:35","dark_hours":8.28,"date":"2045-03-28","moon_free_dark_hours":0.28,"moon_illumination":81,"moon_separation":135.9,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.58,"best_label":"good","best_window":"04:00\u201305:35","dark_hours":8.22,"date":"2045-03-29","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":133.1,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.67,"best_label":"good","best_window":"03:55\u201305:35","dark_hours":8.17,"date":"2045-03-30","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":127.2,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":71.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.58,"best_label":"good","best_window":"03:55\u201305:30","dark_hours":8.12,"date":"2045-03-31","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":119.3,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":71.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.58,"best_label":"good","best_window":"03:55\u201305:30","dark_hours":8.06,"date":"2045-04-01","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":110.1,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.5,"best_label":"good","best_window":"03:55\u201305:25","dark_hours":8.01,"date":"2045-04-02","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":100.5,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":71.1,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.5,"best_label":"good","best_window":"03:55\u201305:25","dark_hours":7.95,"date":"2045-04-03","moon_free_dark_hours":0.83,"moon_illumination":94,"moon_separation":90.7,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":71.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.25,"best_label":"good","best_window":"04:10\u201305:25","dark_hours":7.89,"date":"2045-04-04","moon_free_dark_hours":2.03,"moon_illumination":88,"moon_separation":81.2,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.25,"best_label":"good","best_window":"04:05\u201305:20","dark_hours":7.84,"date":"2045-04-05","moon_free_dark_hours":3.13,"moon_illumination":81,"moon_separation":72.2,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.58,"best_label":"good","best_window":"03:45\u201305:20","dark_hours":7.78,"date":"2045-04-06","moon_free_dark_hours":4.13,"moon_illumination":72,"moon_separation":64.0,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.58,"best_label":"good","best_window":"03:40\u201305:15","dark_hours":7.73,"date":"2045-04-07","moon_free_dark_hours":4.98,"moon_illumination":63,"moon_separation":56.6,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"03:30\u201305:15","dark_hours":7.67,"date":"2045-04-08","moon_free_dark_hours":5.65,"moon_illumination":54,"moon_separation":50.6,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.17,"best_label":"good","best_window":"03:05\u201305:15","dark_hours":7.61,"date":"2045-04-09","moon_free_dark_hours":6.2,"moon_illumination":44,"moon_separation":46.3,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.08,"best_label":"good","best_window":"03:05\u201305:10","dark_hours":7.56,"date":"2045-04-10","moon_free_dark_hours":6.63,"moon_illumination":35,"moon_separation":44.1,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.17,"best_label":"good","best_window":"03:00\u201305:10","dark_hours":7.5,"date":"2045-04-11","moon_free_dark_hours":7.02,"moon_illumination":26,"moon_separation":44.4,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.17,"best_label":"good","best_window":"02:55\u201305:05","dark_hours":7.44,"date":"2045-04-12","moon_free_dark_hours":7.33,"moon_illumination":18,"moon_separation":47.2,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.25,"best_label":"good","best_window":"02:50\u201305:05","dark_hours":7.39,"date":"2045-04-13","moon_free_dark_hours":7.37,"moon_illumination":12,"moon_separation":52.1,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.33,"best_label":"good","best_window":"02:45\u201305:05","dark_hours":7.33,"date":"2045-04-14","moon_free_dark_hours":7.3,"moon_illumination":6,"moon_separation":58.7,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.25,"best_label":"good","best_window":"02:45\u201305:00","dark_hours":7.27,"date":"2045-04-15","moon_free_dark_hours":7.25,"moon_illumination":2,"moon_separation":66.6,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.33,"best_label":"good","best_window":"02:40\u201305:00","dark_hours":7.21,"date":"2045-04-16","moon_free_dark_hours":7.18,"moon_illumination":0,"moon_separation":75.4,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":71.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.33,"best_label":"good","best_window":"02:35\u201304:55","dark_hours":7.15,"date":"2045-04-17","moon_free_dark_hours":7.13,"moon_illumination":1,"moon_separation":84.8,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":7.1,"date":"2045-04-18","moon_free_dark_hours":7.07,"moon_illumination":3,"moon_separation":94.5,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":7.04,"date":"2045-04-19","moon_free_dark_hours":5.9,"moon_illumination":8,"moon_separation":104.3,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":71.1,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Wed"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2045-03-21","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}}