{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":3.08,"best_label":"good","best_window":"01:15\u201304:20","dark_hours":6.0,"date":"2045-05-07","moon_free_dark_hours":3.93,"moon_illumination":61,"moon_separation":44.3,"score":null,"score_astronomy":57,"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":5.94,"date":"2045-05-08","moon_free_dark_hours":4.33,"moon_illumination":52,"moon_separation":43.8,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"06:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.08,"best_label":"good","best_window":"01:10\u201304:15","dark_hours":5.88,"date":"2045-05-09","moon_free_dark_hours":4.68,"moon_illumination":42,"moon_separation":45.8,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":71.1,"transit_local":"06:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.17,"best_label":"good","best_window":"01:05\u201304:15","dark_hours":5.83,"date":"2045-05-10","moon_free_dark_hours":4.98,"moon_illumination":33,"moon_separation":50.0,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":71.1,"transit_local":"06:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.25,"best_label":"good","best_window":"01:00\u201304:15","dark_hours":5.77,"date":"2045-05-11","moon_free_dark_hours":5.27,"moon_illumination":24,"moon_separation":56.1,"score":null,"score_astronomy":82,"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":"00:55\u201304:10","dark_hours":5.72,"date":"2045-05-12","moon_free_dark_hours":5.58,"moon_illumination":16,"moon_separation":63.5,"score":null,"score_astronomy":86,"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":5.66,"date":"2045-05-13","moon_free_dark_hours":5.65,"moon_illumination":10,"moon_separation":72.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":71.1,"transit_local":"05:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.33,"best_label":"good","best_window":"00:50\u201304:10","dark_hours":5.61,"date":"2045-05-14","moon_free_dark_hours":5.6,"moon_illumination":4,"moon_separation":81.3,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":71.1,"transit_local":"05:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.33,"best_label":"good","best_window":"00:45\u201304:05","dark_hours":5.56,"date":"2045-05-15","moon_free_dark_hours":5.53,"moon_illumination":1,"moon_separation":91.1,"score":null,"score_astronomy":90,"score_weather":null,"transit_alt":71.1,"transit_local":"05:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.42,"best_label":"good","best_window":"00:40\u201304:05","dark_hours":5.5,"date":"2045-05-16","moon_free_dark_hours":5.48,"moon_illumination":0,"moon_separation":101.0,"score":null,"score_astronomy":92,"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":5.45,"date":"2045-05-17","moon_free_dark_hours":5.43,"moon_illumination":2,"moon_separation":110.9,"score":null,"score_astronomy":94,"score_weather":null,"transit_alt":71.1,"transit_local":"05:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.42,"best_label":"good","best_window":"00:35\u201304:00","dark_hours":5.4,"date":"2045-05-18","moon_free_dark_hours":5.0,"moon_illumination":6,"moon_separation":120.1,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"05:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.5,"best_label":"good","best_window":"00:30\u201304:00","dark_hours":5.35,"date":"2045-05-19","moon_free_dark_hours":4.02,"moon_illumination":13,"moon_separation":128.0,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"05:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.58,"best_label":"good","best_window":"00:25\u201304:00","dark_hours":5.3,"date":"2045-05-20","moon_free_dark_hours":3.22,"moon_illumination":22,"moon_separation":133.7,"score":null,"score_astronomy":96,"score_weather":null,"transit_alt":71.1,"transit_local":"05:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.58,"best_label":"good","best_window":"00:25\u201304:00","dark_hours":5.25,"date":"2045-05-21","moon_free_dark_hours":2.6,"moon_illumination":32,"moon_separation":136.4,"score":null,"score_astronomy":98,"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":"00:20\u201303:55","dark_hours":5.2,"date":"2045-05-22","moon_free_dark_hours":2.07,"moon_illumination":43,"moon_separation":135.3,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":71.1,"transit_local":"05:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.58,"best_label":"good","best_window":"00:20\u201303:55","dark_hours":5.16,"date":"2045-05-23","moon_free_dark_hours":1.63,"moon_illumination":55,"moon_separation":131.0,"score":null,"score_astronomy":98,"score_weather":null,"transit_alt":71.1,"transit_local":"05:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.67,"best_label":"good","best_window":"00:15\u201303:55","dark_hours":5.11,"date":"2045-05-24","moon_free_dark_hours":1.23,"moon_illumination":66,"moon_separation":124.2,"score":null,"score_astronomy":97,"score_weather":null,"transit_alt":71.1,"transit_local":"05:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.58,"best_label":"good","best_window":"00:15\u201303:50","dark_hours":5.06,"date":"2045-05-25","moon_free_dark_hours":0.82,"moon_illumination":76,"moon_separation":115.9,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":71.1,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.58,"best_label":"good","best_window":"00:15\u201303:50","dark_hours":5.02,"date":"2045-05-26","moon_free_dark_hours":0.42,"moon_illumination":84,"moon_separation":106.8,"score":null,"score_astronomy":92,"score_weather":null,"transit_alt":71.1,"transit_local":"05:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.5,"best_label":"good","best_window":"00:20\u201303:50","dark_hours":4.98,"date":"2045-05-27","moon_free_dark_hours":0.0,"moon_illumination":91,"moon_separation":97.3,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":71.1,"transit_local":"05:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.25,"best_label":"good","best_window":"00:35\u201303:50","dark_hours":4.93,"date":"2045-05-28","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":87.8,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"04:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.58,"best_label":"good","best_window":"01:15\u201303:50","dark_hours":4.89,"date":"2045-05-29","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":78.4,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.92,"best_label":"good","best_window":"01:50\u201303:45","dark_hours":4.86,"date":"2045-05-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":69.5,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":71.1,"transit_local":"04:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.33,"best_label":"good","best_window":"02:25\u201303:45","dark_hours":4.82,"date":"2045-05-31","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":61.4,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":71.1,"transit_local":"04:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.5,"best_label":"marginal","best_window":"23:15\u201303:45","dark_hours":4.78,"date":"2045-06-01","moon_free_dark_hours":0.07,"moon_illumination":95,"moon_separation":54.2,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":71.1,"transit_local":"04:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"good","best_window":"23:35\u201323:45","dark_hours":4.75,"date":"2045-06-02","moon_free_dark_hours":0.73,"moon_illumination":90,"moon_separation":48.6,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":71.1,"transit_local":"04:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.58,"best_label":"good","best_window":"01:40\u201303:15","dark_hours":4.71,"date":"2045-06-03","moon_free_dark_hours":1.27,"moon_illumination":84,"moon_separation":44.8,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":71.1,"transit_local":"04:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.25,"best_label":"good","best_window":"23:25\u201303:40","dark_hours":4.68,"date":"2045-06-04","moon_free_dark_hours":1.68,"moon_illumination":76,"moon_separation":43.4,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":71.1,"transit_local":"04:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.25,"best_label":"good","best_window":"23:25\u201303:40","dark_hours":4.65,"date":"2045-06-05","moon_free_dark_hours":2.05,"moon_illumination":68,"moon_separation":44.6,"score":null,"score_astronomy":83,"score_weather":null,"transit_alt":71.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Mon"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2045-05-07","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}}