{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.75,"best_label":"marginal","best_window":"02:00\u201303:45","dark_hours":4.86,"date":"2025-05-30","moon_free_dark_hours":3.25,"moon_illumination":19,"moon_separation":133.3,"score":22,"score_astronomy":100,"score_weather":22,"transit_alt":71.1,"transit_local":"04:50","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":3.67,"best_label":"good","best_window":"00:05\u201303:45","dark_hours":4.82,"date":"2025-05-31","moon_free_dark_hours":2.68,"moon_illumination":28,"moon_separation":134.3,"score":85,"score_astronomy":100,"score_weather":85,"transit_alt":71.1,"transit_local":"04:45","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":1.83,"best_label":"marginal","best_window":"23:10\u201301:00","dark_hours":4.79,"date":"2025-06-01","moon_free_dark_hours":2.23,"moon_illumination":38,"moon_separation":132.4,"score":19,"score_astronomy":100,"score_weather":19,"transit_alt":71.1,"transit_local":"04:40","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":4.0,"best_label":"good","best_window":"23:45\u201303:45","dark_hours":4.75,"date":"2025-06-02","moon_free_dark_hours":1.85,"moon_illumination":48,"moon_separation":128.2,"score":99,"score_astronomy":100,"score_weather":99,"transit_alt":71.1,"transit_local":"04:35","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":4.17,"best_label":"good","best_window":"23:35\u201303:45","dark_hours":4.72,"date":"2025-06-03","moon_free_dark_hours":1.52,"moon_illumination":58,"moon_separation":122.4,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"04:30","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":4.08,"best_label":"good","best_window":"23:35\u201303:40","dark_hours":4.69,"date":"2025-06-04","moon_free_dark_hours":1.2,"moon_illumination":67,"moon_separation":115.5,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"04:30","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":0.67,"best_label":"good","best_window":"03:00\u201303:40","dark_hours":4.65,"date":"2025-06-05","moon_free_dark_hours":0.88,"moon_illumination":76,"moon_separation":107.9,"score":18,"score_astronomy":100,"score_weather":18,"transit_alt":71.1,"transit_local":"04:25","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":4.0,"best_label":"good","best_window":"23:40\u201303:40","dark_hours":4.63,"date":"2025-06-06","moon_free_dark_hours":0.53,"moon_illumination":83,"moon_separation":99.9,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"04:20","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":4.0,"best_label":"good","best_window":"23:40\u201303:40","dark_hours":4.6,"date":"2025-06-07","moon_free_dark_hours":0.15,"moon_illumination":90,"moon_separation":91.6,"score":96,"score_astronomy":96,"score_weather":100,"transit_alt":71.1,"transit_local":"04:15","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":3.42,"best_label":"good","best_window":"00:15\u201303:40","dark_hours":4.57,"date":"2025-06-08","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":83.3,"score":72,"score_astronomy":72,"score_weather":100,"transit_alt":71.1,"transit_local":"04:10","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":2.5,"best_label":"good","best_window":"01:10\u201303:40","dark_hours":4.55,"date":"2025-06-09","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":75.1,"score":58,"score_astronomy":62,"score_weather":94,"transit_alt":71.1,"transit_local":"04:10","verdict":"marginal","weather_source":"history","weekday":"Mon"},{"best_hours":3.0,"best_label":"marginal","best_window":"00:00\u201303:00","dark_hours":4.53,"date":"2025-06-10","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":67.2,"score":30,"score_astronomy":54,"score_weather":55,"transit_alt":71.1,"transit_local":"04:05","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":4.5,"best_label":"marginal","best_window":"23:10\u201303:40","dark_hours":4.51,"date":"2025-06-11","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":59.8,"score":45,"score_astronomy":48,"score_weather":94,"transit_alt":71.1,"transit_local":"04:00","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":4.5,"best_label":"marginal","best_window":"23:10\u201303:40","dark_hours":4.49,"date":"2025-06-12","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":53.4,"score":44,"score_astronomy":44,"score_weather":100,"transit_alt":71.1,"transit_local":"03:55","verdict":"marginal","weather_source":"history","weekday":"Thu"},{"best_hours":3.67,"best_label":"marginal","best_window":"00:00\u201303:40","dark_hours":4.47,"date":"2025-06-13","moon_free_dark_hours":0.2,"moon_illumination":93,"moon_separation":48.6,"score":44,"score_astronomy":62,"score_weather":71,"transit_alt":71.1,"transit_local":"03:55","verdict":"marginal","weather_source":"history","weekday":"Fri"},{"best_hours":1.67,"best_label":"marginal","best_window":"02:00\u201303:40","dark_hours":4.46,"date":"2025-06-14","moon_free_dark_hours":0.78,"moon_illumination":87,"moon_separation":45.9,"score":26,"score_astronomy":72,"score_weather":36,"transit_alt":71.1,"transit_local":"03:50","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.42,"best_label":"good","best_window":"00:00\u201300:25","dark_hours":4.45,"date":"2025-06-15","moon_free_dark_hours":1.25,"moon_illumination":79,"moon_separation":45.9,"score":67,"score_astronomy":83,"score_weather":81,"transit_alt":71.1,"transit_local":"03:45","verdict":"marginal","weather_source":"history","weekday":"Sun"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.44,"date":"2025-06-16","moon_free_dark_hours":1.67,"moon_illumination":70,"moon_separation":48.8,"score":91,"score_astronomy":93,"score_weather":97,"transit_alt":71.1,"transit_local":"03:40","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.43,"date":"2025-06-17","moon_free_dark_hours":2.02,"moon_illumination":60,"moon_separation":54.2,"score":95,"score_astronomy":96,"score_weather":99,"transit_alt":71.1,"transit_local":"03:35","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.43,"date":"2025-06-18","moon_free_dark_hours":2.38,"moon_illumination":49,"moon_separation":61.6,"score":96,"score_astronomy":99,"score_weather":97,"transit_alt":71.1,"transit_local":"03:35","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.42,"date":"2025-06-19","moon_free_dark_hours":2.75,"moon_illumination":37,"moon_separation":70.3,"score":97,"score_astronomy":100,"score_weather":97,"transit_alt":71.1,"transit_local":"03:30","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.42,"date":"2025-06-20","moon_free_dark_hours":3.15,"moon_illumination":26,"moon_separation":80.0,"score":91,"score_astronomy":100,"score_weather":91,"transit_alt":71.1,"transit_local":"03:25","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":3.67,"best_label":"good","best_window":"00:00\u201303:40","dark_hours":4.42,"date":"2025-06-21","moon_free_dark_hours":3.65,"moon_illumination":17,"moon_separation":90.1,"score":83,"score_astronomy":100,"score_weather":83,"transit_alt":71.1,"transit_local":"03:20","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.42,"date":"2025-06-22","moon_free_dark_hours":4.27,"moon_illumination":9,"moon_separation":100.4,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"03:15","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.43,"date":"2025-06-23","moon_free_dark_hours":4.42,"moon_illumination":3,"moon_separation":110.3,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"03:15","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.44,"date":"2025-06-24","moon_free_dark_hours":4.42,"moon_illumination":1,"moon_separation":119.4,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"03:10","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.45,"date":"2025-06-25","moon_free_dark_hours":4.43,"moon_illumination":0,"moon_separation":126.9,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"03:05","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.46,"date":"2025-06-26","moon_free_dark_hours":4.43,"moon_illumination":3,"moon_separation":132.1,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"03:00","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":4.42,"best_label":"good","best_window":"23:15\u201303:40","dark_hours":4.47,"date":"2025-06-27","moon_free_dark_hours":4.45,"moon_illumination":8,"moon_separation":134.5,"score":78,"score_astronomy":100,"score_weather":78,"transit_alt":71.1,"transit_local":"03:00","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":0.67,"best_label":"good","best_window":"03:00\u201303:40","dark_hours":4.48,"date":"2025-06-28","moon_free_dark_hours":4.18,"moon_illumination":15,"moon_separation":133.7,"score":38,"score_astronomy":100,"score_weather":38,"transit_alt":71.1,"transit_local":"02:55","verdict":"poor","weather_source":"history","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":"2025-05-30","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}}
