{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.75,"best_label":"good","best_window":"03:40\u201305:25","dark_hours":7.98,"date":"2031-04-03","moon_free_dark_hours":0.55,"moon_illumination":84,"moon_separation":139.4,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.83,"best_label":"good","best_window":"03:35\u201305:25","dark_hours":7.93,"date":"2031-04-04","moon_free_dark_hours":0.03,"moon_illumination":91,"moon_separation":133.5,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":71.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"03:35\u201305:20","dark_hours":7.87,"date":"2031-04-05","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":125.4,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.75,"best_label":"good","best_window":"03:35\u201305:20","dark_hours":7.82,"date":"2031-04-06","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":116.0,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.75,"best_label":"good","best_window":"03:35\u201305:20","dark_hours":7.76,"date":"2031-04-07","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":105.5,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.58,"best_label":"good","best_window":"03:40\u201305:15","dark_hours":7.7,"date":"2031-04-08","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":94.5,"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":1.08,"best_label":"good","best_window":"04:10\u201305:15","dark_hours":7.65,"date":"2031-04-09","moon_free_dark_hours":0.77,"moon_illumination":94,"moon_separation":83.2,"score":null,"score_astronomy":28,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.58,"best_label":"good","best_window":"04:35\u201305:10","dark_hours":7.59,"date":"2031-04-10","moon_free_dark_hours":1.87,"moon_illumination":87,"moon_separation":72.0,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.5,"best_label":"good","best_window":"04:40\u201305:10","dark_hours":7.53,"date":"2031-04-11","moon_free_dark_hours":2.92,"moon_illumination":78,"moon_separation":61.3,"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":1.0,"best_label":"good","best_window":"04:10\u201305:10","dark_hours":7.48,"date":"2031-04-12","moon_free_dark_hours":3.83,"moon_illumination":68,"moon_separation":51.5,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.75,"best_label":"good","best_window":"03:20\u201305:05","dark_hours":7.42,"date":"2031-04-13","moon_free_dark_hours":4.65,"moon_illumination":57,"moon_separation":43.5,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.0,"best_label":"good","best_window":"03:05\u201305:05","dark_hours":7.36,"date":"2031-04-14","moon_free_dark_hours":5.32,"moon_illumination":46,"moon_separation":38.4,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":71.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"02:45\u201305:00","dark_hours":7.31,"date":"2031-04-15","moon_free_dark_hours":5.92,"moon_illumination":34,"moon_separation":37.4,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":71.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.33,"best_label":"good","best_window":"02:40\u201305:00","dark_hours":7.25,"date":"2031-04-16","moon_free_dark_hours":6.43,"moon_illumination":24,"moon_separation":40.7,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":71.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.42,"best_label":"good","best_window":"02:35\u201305:00","dark_hours":7.19,"date":"2031-04-17","moon_free_dark_hours":6.92,"moon_illumination":16,"moon_separation":47.2,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.33,"best_label":"good","best_window":"02:35\u201304:55","dark_hours":7.13,"date":"2031-04-18","moon_free_dark_hours":7.12,"moon_illumination":8,"moon_separation":55.6,"score":null,"score_astronomy":61,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":7.07,"date":"2031-04-19","moon_free_dark_hours":7.07,"moon_illumination":4,"moon_separation":65.1,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":71.1,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.5,"best_label":"good","best_window":"02:25\u201304:55","dark_hours":7.02,"date":"2031-04-20","moon_free_dark_hours":7.0,"moon_illumination":1,"moon_separation":75.1,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.5,"best_label":"good","best_window":"02:20\u201304:50","dark_hours":6.96,"date":"2031-04-21","moon_free_dark_hours":6.95,"moon_illumination":0,"moon_separation":85.2,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"good","best_window":"02:20\u201304:50","dark_hours":6.9,"date":"2031-04-22","moon_free_dark_hours":6.88,"moon_illumination":2,"moon_separation":95.3,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.5,"best_label":"good","best_window":"02:15\u201304:45","dark_hours":6.84,"date":"2031-04-23","moon_free_dark_hours":6.68,"moon_illumination":5,"moon_separation":105.0,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.58,"best_label":"good","best_window":"02:10\u201304:45","dark_hours":6.78,"date":"2031-04-24","moon_free_dark_hours":5.73,"moon_illumination":10,"moon_separation":114.4,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":71.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.67,"best_label":"good","best_window":"02:05\u201304:45","dark_hours":6.72,"date":"2031-04-25","moon_free_dark_hours":4.87,"moon_illumination":16,"moon_separation":123.0,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":71.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.67,"best_label":"good","best_window":"02:00\u201304:40","dark_hours":6.67,"date":"2031-04-26","moon_free_dark_hours":4.08,"moon_illumination":24,"moon_separation":130.8,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":71.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.67,"best_label":"good","best_window":"02:00\u201304:40","dark_hours":6.61,"date":"2031-04-27","moon_free_dark_hours":3.38,"moon_illumination":32,"moon_separation":137.1,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.67,"best_label":"good","best_window":"01:55\u201304:35","dark_hours":6.55,"date":"2031-04-28","moon_free_dark_hours":2.77,"moon_illumination":42,"moon_separation":141.4,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.67,"best_label":"good","best_window":"01:55\u201304:35","dark_hours":6.49,"date":"2031-04-29","moon_free_dark_hours":2.2,"moon_illumination":51,"moon_separation":142.8,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.75,"best_label":"good","best_window":"01:50\u201304:35","dark_hours":6.43,"date":"2031-04-30","moon_free_dark_hours":1.7,"moon_illumination":61,"moon_separation":141.0,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":71.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"01:50\u201304:30","dark_hours":6.38,"date":"2031-05-01","moon_free_dark_hours":1.2,"moon_illumination":70,"moon_separation":136.1,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":71.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.75,"best_label":"good","best_window":"01:45\u201304:30","dark_hours":6.32,"date":"2031-05-02","moon_free_dark_hours":0.7,"moon_illumination":79,"moon_separation":128.9,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","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":"2031-04-03","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}}
