{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.58,"best_label":"good","best_window":"03:55\u201304:30","dark_hours":6.35,"date":"2029-05-01","moon_free_dark_hours":2.13,"moon_illumination":84,"moon_separation":55.5,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.17,"best_label":"good","best_window":"03:20\u201304:30","dark_hours":6.29,"date":"2029-05-02","moon_free_dark_hours":2.9,"moon_illumination":75,"moon_separation":47.5,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.42,"best_label":"good","best_window":"02:00\u201304:25","dark_hours":6.23,"date":"2029-05-03","moon_free_dark_hours":3.53,"moon_illumination":65,"moon_separation":41.9,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.92,"best_label":"good","best_window":"01:30\u201304:25","dark_hours":6.17,"date":"2029-05-04","moon_free_dark_hours":4.03,"moon_illumination":55,"moon_separation":39.4,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.0,"best_label":"good","best_window":"01:25\u201304:25","dark_hours":6.12,"date":"2029-05-05","moon_free_dark_hours":4.47,"moon_illumination":45,"moon_separation":40.2,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":71.1,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"01:20\u201304:20","dark_hours":6.06,"date":"2029-05-06","moon_free_dark_hours":4.83,"moon_illumination":35,"moon_separation":43.9,"score":null,"score_astronomy":68,"score_weather":null,"transit_alt":71.1,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.08,"best_label":"good","best_window":"01:15\u201304:20","dark_hours":6.0,"date":"2029-05-07","moon_free_dark_hours":5.18,"moon_illumination":26,"moon_separation":49.8,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":71.1,"transit_local":"06:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.08,"best_label":"good","best_window":"01:15\u201304:20","dark_hours":5.95,"date":"2029-05-08","moon_free_dark_hours":5.53,"moon_illumination":19,"moon_separation":57.1,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.08,"best_label":"good","best_window":"01:10\u201304:15","dark_hours":5.89,"date":"2029-05-09","moon_free_dark_hours":5.88,"moon_illumination":12,"moon_separation":65.2,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":71.1,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.17,"best_label":"good","best_window":"01:05\u201304:15","dark_hours":5.83,"date":"2029-05-10","moon_free_dark_hours":5.82,"moon_illumination":6,"moon_separation":73.9,"score":null,"score_astronomy":85,"score_weather":null,"transit_alt":71.1,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.25,"best_label":"good","best_window":"01:00\u201304:15","dark_hours":5.78,"date":"2029-05-11","moon_free_dark_hours":5.77,"moon_illumination":3,"moon_separation":83.0,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":71.1,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.25,"best_label":"good","best_window":"00:55\u201304:10","dark_hours":5.72,"date":"2029-05-12","moon_free_dark_hours":5.7,"moon_illumination":0,"moon_separation":92.2,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":71.1,"transit_local":"06:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.25,"best_label":"good","best_window":"00:55\u201304:10","dark_hours":5.67,"date":"2029-05-13","moon_free_dark_hours":5.65,"moon_illumination":0,"moon_separation":101.5,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":71.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.33,"best_label":"good","best_window":"00:50\u201304:10","dark_hours":5.62,"date":"2029-05-14","moon_free_dark_hours":5.6,"moon_illumination":2,"moon_separation":110.7,"score":null,"score_astronomy":91,"score_weather":null,"transit_alt":71.1,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.33,"best_label":"good","best_window":"00:45\u201304:05","dark_hours":5.56,"date":"2029-05-15","moon_free_dark_hours":5.52,"moon_illumination":5,"moon_separation":119.6,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":71.1,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.42,"best_label":"good","best_window":"00:40\u201304:05","dark_hours":5.51,"date":"2029-05-16","moon_free_dark_hours":4.67,"moon_illumination":11,"moon_separation":127.7,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":71.1,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.42,"best_label":"good","best_window":"00:40\u201304:05","dark_hours":5.46,"date":"2029-05-17","moon_free_dark_hours":3.95,"moon_illumination":18,"moon_separation":134.6,"score":null,"score_astronomy":94,"score_weather":null,"transit_alt":71.1,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.42,"best_label":"good","best_window":"00:35\u201304:00","dark_hours":5.41,"date":"2029-05-18","moon_free_dark_hours":3.3,"moon_illumination":26,"moon_separation":139.3,"score":null,"score_astronomy":94,"score_weather":null,"transit_alt":71.1,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.5,"best_label":"good","best_window":"00:30\u201304:00","dark_hours":5.36,"date":"2029-05-19","moon_free_dark_hours":2.73,"moon_illumination":36,"moon_separation":140.8,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.5,"best_label":"good","best_window":"00:30\u201304:00","dark_hours":5.31,"date":"2029-05-20","moon_free_dark_hours":2.22,"moon_illumination":47,"moon_separation":138.6,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.58,"best_label":"good","best_window":"00:25\u201304:00","dark_hours":5.26,"date":"2029-05-21","moon_free_dark_hours":1.73,"moon_illumination":58,"moon_separation":132.9,"score":null,"score_astronomy":96,"score_weather":null,"transit_alt":71.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.5,"best_label":"good","best_window":"00:25\u201303:55","dark_hours":5.21,"date":"2029-05-22","moon_free_dark_hours":1.25,"moon_illumination":70,"moon_separation":124.7,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.5,"best_label":"good","best_window":"00:25\u201303:55","dark_hours":5.16,"date":"2029-05-23","moon_free_dark_hours":0.75,"moon_illumination":80,"moon_separation":114.8,"score":null,"score_astronomy":93,"score_weather":null,"transit_alt":71.1,"transit_local":"05:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.42,"best_label":"good","best_window":"00:30\u201303:55","dark_hours":5.11,"date":"2029-05-24","moon_free_dark_hours":0.2,"moon_illumination":88,"moon_separation":103.8,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":71.1,"transit_local":"05:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.42,"best_label":"good","best_window":"00:30\u201303:55","dark_hours":5.07,"date":"2029-05-25","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":92.4,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":71.1,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.5,"best_label":"good","best_window":"01:20\u201303:50","dark_hours":5.03,"date":"2029-05-26","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":80.9,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":71.1,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.58,"best_label":"good","best_window":"02:15\u201303:50","dark_hours":4.98,"date":"2029-05-27","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":69.7,"score":null,"score_astronomy":46,"score_weather":null,"transit_alt":71.1,"transit_local":"05:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.5,"best_label":"good","best_window":"03:20\u201303:50","dark_hours":4.94,"date":"2029-05-28","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":59.4,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":71.1,"transit_local":"04:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.33,"best_label":"marginal","best_window":"23:30\u201303:50","dark_hours":4.9,"date":"2029-05-29","moon_free_dark_hours":0.02,"moon_illumination":94,"moon_separation":50.4,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.42,"best_label":"marginal","best_window":"23:20\u201303:45","dark_hours":4.86,"date":"2029-05-30","moon_free_dark_hours":0.73,"moon_illumination":88,"moon_separation":43.6,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":71.1,"transit_local":"04:50","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":"2029-05-01","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}}