{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.58,"best_label":"good","best_window":"02:15\u201304:50","dark_hours":6.87,"date":"2041-04-22","moon_free_dark_hours":4.97,"moon_illumination":59,"moon_separation":49.3,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":71.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.58,"best_label":"good","best_window":"02:10\u201304:45","dark_hours":6.81,"date":"2041-04-23","moon_free_dark_hours":5.68,"moon_illumination":48,"moon_separation":47.4,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.58,"best_label":"good","best_window":"02:10\u201304:45","dark_hours":6.75,"date":"2041-04-24","moon_free_dark_hours":6.25,"moon_illumination":36,"moon_separation":48.7,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":71.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.58,"best_label":"good","best_window":"02:05\u201304:40","dark_hours":6.69,"date":"2041-04-25","moon_free_dark_hours":6.68,"moon_illumination":26,"moon_separation":53.0,"score":null,"score_astronomy":68,"score_weather":null,"transit_alt":71.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.67,"best_label":"good","best_window":"02:00\u201304:40","dark_hours":6.63,"date":"2041-04-26","moon_free_dark_hours":6.62,"moon_illumination":16,"moon_separation":59.6,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":71.1,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.75,"best_label":"good","best_window":"01:55\u201304:40","dark_hours":6.57,"date":"2041-04-27","moon_free_dark_hours":6.55,"moon_illumination":8,"moon_separation":67.8,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":71.1,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.75,"best_label":"good","best_window":"01:50\u201304:35","dark_hours":6.52,"date":"2041-04-28","moon_free_dark_hours":6.5,"moon_illumination":3,"moon_separation":76.8,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":71.1,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.75,"best_label":"good","best_window":"01:50\u201304:35","dark_hours":6.46,"date":"2041-04-29","moon_free_dark_hours":6.43,"moon_illumination":0,"moon_separation":86.3,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":71.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.75,"best_label":"good","best_window":"01:45\u201304:30","dark_hours":6.4,"date":"2041-04-30","moon_free_dark_hours":6.38,"moon_illumination":0,"moon_separation":95.7,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":71.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"01:40\u201304:30","dark_hours":6.34,"date":"2041-05-01","moon_free_dark_hours":6.33,"moon_illumination":2,"moon_separation":104.7,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"01:35\u201304:30","dark_hours":6.28,"date":"2041-05-02","moon_free_dark_hours":5.65,"moon_illumination":7,"moon_separation":113.0,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"01:35\u201304:25","dark_hours":6.23,"date":"2041-05-03","moon_free_dark_hours":4.53,"moon_illumination":13,"moon_separation":120.3,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":71.1,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"good","best_window":"01:30\u201304:25","dark_hours":6.17,"date":"2041-05-04","moon_free_dark_hours":3.53,"moon_illumination":21,"moon_separation":126.2,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":71.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"01:25\u201304:25","dark_hours":6.11,"date":"2041-05-05","moon_free_dark_hours":2.68,"moon_illumination":29,"moon_separation":130.3,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.92,"best_label":"good","best_window":"01:25\u201304:20","dark_hours":6.05,"date":"2041-05-06","moon_free_dark_hours":2.02,"moon_illumination":38,"moon_separation":132.4,"score":null,"score_astronomy":79,"score_weather":null,"transit_alt":71.1,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.0,"best_label":"good","best_window":"01:20\u201304:20","dark_hours":6.0,"date":"2041-05-07","moon_free_dark_hours":1.43,"moon_illumination":48,"moon_separation":132.2,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.0,"best_label":"good","best_window":"01:20\u201304:20","dark_hours":5.94,"date":"2041-05-08","moon_free_dark_hours":0.95,"moon_illumination":57,"moon_separation":129.8,"score":null,"score_astronomy":81,"score_weather":null,"transit_alt":71.1,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.0,"best_label":"good","best_window":"01:15\u201304:15","dark_hours":5.89,"date":"2041-05-09","moon_free_dark_hours":0.53,"moon_illumination":66,"moon_separation":125.6,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.0,"best_label":"good","best_window":"01:15\u201304:15","dark_hours":5.83,"date":"2041-05-10","moon_free_dark_hours":0.17,"moon_illumination":75,"moon_separation":119.8,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.0,"best_label":"good","best_window":"01:15\u201304:15","dark_hours":5.77,"date":"2041-05-11","moon_free_dark_hours":0.0,"moon_illumination":83,"moon_separation":112.9,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.92,"best_label":"good","best_window":"01:15\u201304:10","dark_hours":5.72,"date":"2041-05-12","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":105.2,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.83,"best_label":"good","best_window":"01:20\u201304:10","dark_hours":5.67,"date":"2041-05-13","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":96.9,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":71.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.33,"best_label":"good","best_window":"01:50\u201304:10","dark_hours":5.61,"date":"2041-05-14","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":88.1,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":71.1,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.75,"best_label":"good","best_window":"02:20\u201304:05","dark_hours":5.56,"date":"2041-05-15","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":79.2,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.25,"best_label":"good","best_window":"02:50\u201304:05","dark_hours":5.51,"date":"2041-05-16","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":70.5,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.92,"best_label":"good","best_window":"03:10\u201304:05","dark_hours":5.45,"date":"2041-05-17","moon_free_dark_hours":0.13,"moon_illumination":96,"moon_separation":62.3,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":71.1,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.0,"best_label":"good","best_window":"03:00\u201304:00","dark_hours":5.4,"date":"2041-05-18","moon_free_dark_hours":1.23,"moon_illumination":90,"moon_separation":55.3,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":71.1,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.25,"best_label":"good","best_window":"01:45\u201304:00","dark_hours":5.35,"date":"2041-05-19","moon_free_dark_hours":2.18,"moon_illumination":82,"moon_separation":50.1,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":71.1,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.58,"best_label":"good","best_window":"00:25\u201304:00","dark_hours":5.3,"date":"2041-05-20","moon_free_dark_hours":2.95,"moon_illumination":72,"moon_separation":47.6,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.67,"best_label":"good","best_window":"00:20\u201304:00","dark_hours":5.25,"date":"2041-05-21","moon_free_dark_hours":3.57,"moon_illumination":62,"moon_separation":48.1,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":71.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2041-04-22","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}}