{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":7.07,"date":"2047-04-19","moon_free_dark_hours":6.47,"moon_illumination":23,"moon_separation":44.0,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":71.2,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.42,"best_label":"good","best_window":"02:25\u201304:50","dark_hours":7.01,"date":"2047-04-20","moon_free_dark_hours":6.8,"moon_illumination":16,"moon_separation":49.4,"score":null,"score_astronomy":61,"score_weather":null,"transit_alt":71.1,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.5,"best_label":"good","best_window":"02:20\u201304:50","dark_hours":6.95,"date":"2047-04-21","moon_free_dark_hours":6.93,"moon_illumination":10,"moon_separation":56.4,"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":6.89,"date":"2047-04-22","moon_free_dark_hours":6.88,"moon_illumination":5,"moon_separation":64.3,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":71.2,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"good","best_window":"02:15\u201304:45","dark_hours":6.83,"date":"2047-04-23","moon_free_dark_hours":6.82,"moon_illumination":2,"moon_separation":72.7,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.2,"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":6.78,"date":"2047-04-24","moon_free_dark_hours":6.77,"moon_illumination":0,"moon_separation":81.6,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":71.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"02:05\u201304:45","dark_hours":6.72,"date":"2047-04-25","moon_free_dark_hours":6.7,"moon_illumination":1,"moon_separation":90.6,"score":null,"score_astronomy":69,"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":6.66,"date":"2047-04-26","moon_free_dark_hours":6.65,"moon_illumination":3,"moon_separation":99.6,"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":6.6,"date":"2047-04-27","moon_free_dark_hours":5.88,"moon_illumination":7,"moon_separation":108.5,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.2,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.67,"best_label":"good","best_window":"01:55\u201304:35","dark_hours":6.54,"date":"2047-04-28","moon_free_dark_hours":4.93,"moon_illumination":12,"moon_separation":117.1,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.2,"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":6.48,"date":"2047-04-29","moon_free_dark_hours":4.08,"moon_illumination":19,"moon_separation":125.1,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":71.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"01:45\u201304:35","dark_hours":6.43,"date":"2047-04-30","moon_free_dark_hours":3.33,"moon_illumination":28,"moon_separation":132.0,"score":null,"score_astronomy":74,"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":"01:45\u201304:30","dark_hours":6.37,"date":"2047-05-01","moon_free_dark_hours":2.68,"moon_illumination":37,"moon_separation":137.2,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":71.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.83,"best_label":"good","best_window":"01:40\u201304:30","dark_hours":6.31,"date":"2047-05-02","moon_free_dark_hours":2.12,"moon_illumination":48,"moon_separation":139.7,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":71.2,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"01:40\u201304:30","dark_hours":6.25,"date":"2047-05-03","moon_free_dark_hours":1.6,"moon_illumination":58,"moon_separation":138.7,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":71.2,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.83,"best_label":"good","best_window":"01:35\u201304:25","dark_hours":6.19,"date":"2047-05-04","moon_free_dark_hours":1.13,"moon_illumination":69,"moon_separation":134.1,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":71.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.83,"best_label":"good","best_window":"01:35\u201304:25","dark_hours":6.14,"date":"2047-05-05","moon_free_dark_hours":0.65,"moon_illumination":79,"moon_separation":126.7,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":71.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.75,"best_label":"good","best_window":"01:35\u201304:20","dark_hours":6.08,"date":"2047-05-06","moon_free_dark_hours":0.15,"moon_illumination":88,"moon_separation":117.2,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":71.2,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.75,"best_label":"good","best_window":"01:35\u201304:20","dark_hours":6.02,"date":"2047-05-07","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":106.5,"score":null,"score_astronomy":61,"score_weather":null,"transit_alt":71.2,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.67,"best_label":"good","best_window":"01:40\u201304:20","dark_hours":5.97,"date":"2047-05-08","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":95.0,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":71.1,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.92,"best_label":"good","best_window":"02:20\u201304:15","dark_hours":5.91,"date":"2047-05-09","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":83.4,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.25,"best_label":"good","best_window":"03:00\u201304:15","dark_hours":5.85,"date":"2047-05-10","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":72.1,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":71.1,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.75,"best_label":"good","best_window":"03:30\u201304:15","dark_hours":5.8,"date":"2047-05-11","moon_free_dark_hours":0.7,"moon_illumination":93,"moon_separation":61.6,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":71.2,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.42,"best_label":"good","best_window":"03:45\u201304:10","dark_hours":5.74,"date":"2047-05-12","moon_free_dark_hours":1.63,"moon_illumination":86,"moon_separation":52.5,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.2,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.17,"best_label":"good","best_window":"03:00\u201304:10","dark_hours":5.69,"date":"2047-05-13","moon_free_dark_hours":2.35,"moon_illumination":78,"moon_separation":45.4,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":71.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.33,"best_label":"good","best_window":"00:50\u201304:10","dark_hours":5.64,"date":"2047-05-14","moon_free_dark_hours":2.92,"moon_illumination":68,"moon_separation":41.1,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.33,"best_label":"good","best_window":"00:45\u201304:05","dark_hours":5.58,"date":"2047-05-15","moon_free_dark_hours":3.4,"moon_illumination":58,"moon_separation":40.2,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":71.1,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.33,"best_label":"good","best_window":"00:45\u201304:05","dark_hours":5.53,"date":"2047-05-16","moon_free_dark_hours":3.78,"moon_illumination":48,"moon_separation":42.7,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.2,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.42,"best_label":"good","best_window":"00:40\u201304:05","dark_hours":5.48,"date":"2047-05-17","moon_free_dark_hours":4.13,"moon_illumination":38,"moon_separation":47.6,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.2,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.5,"best_label":"good","best_window":"00:35\u201304:05","dark_hours":5.42,"date":"2047-05-18","moon_free_dark_hours":4.47,"moon_illumination":29,"moon_separation":54.3,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":71.1,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Sat"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2047-04-19","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}}