{"calculation_version":"2026-10-10.1","days":30,"nights":[{"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"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.5,"date":"2025-06-29","moon_free_dark_hours":3.78,"moon_illumination":23,"moon_separation":130.1,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"02:50","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":4.58,"best_label":"good","best_window":"23:10\u201303:45","dark_hours":4.52,"date":"2025-06-30","moon_free_dark_hours":3.47,"moon_illumination":32,"moon_separation":124.7,"score":94,"score_astronomy":100,"score_weather":94,"transit_alt":71.1,"transit_local":"02:45","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":3.75,"best_label":"good","best_window":"00:00\u201303:45","dark_hours":4.54,"date":"2025-07-01","moon_free_dark_hours":3.17,"moon_illumination":42,"moon_separation":117.9,"score":88,"score_astronomy":100,"score_weather":88,"transit_alt":71.1,"transit_local":"02:40","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":4.58,"best_label":"good","best_window":"23:10\u201303:45","dark_hours":4.56,"date":"2025-07-02","moon_free_dark_hours":2.87,"moon_illumination":51,"moon_separation":110.4,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"02:40","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":4.58,"best_label":"good","best_window":"23:10\u201303:45","dark_hours":4.59,"date":"2025-07-03","moon_free_dark_hours":2.57,"moon_illumination":61,"moon_separation":102.4,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"02:35","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":4.58,"best_label":"good","best_window":"23:10\u201303:45","dark_hours":4.62,"date":"2025-07-04","moon_free_dark_hours":2.23,"moon_illumination":70,"moon_separation":94.2,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"02:30","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":4.67,"best_label":"good","best_window":"23:10\u201303:50","dark_hours":4.64,"date":"2025-07-05","moon_free_dark_hours":1.83,"moon_illumination":78,"moon_separation":85.9,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":71.1,"transit_local":"02:25","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":4.67,"best_label":"good","best_window":"23:10\u201303:50","dark_hours":4.67,"date":"2025-07-06","moon_free_dark_hours":1.33,"moon_illumination":85,"moon_separation":77.6,"score":99,"score_astronomy":100,"score_weather":99,"transit_alt":71.1,"transit_local":"02:20","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":4.58,"best_label":"good","best_window":"23:15\u201303:50","dark_hours":4.7,"date":"2025-07-07","moon_free_dark_hours":0.72,"moon_illumination":91,"moon_separation":69.6,"score":99,"score_astronomy":100,"score_weather":99,"transit_alt":71.1,"transit_local":"02:20","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":4.25,"best_label":"good","best_window":"23:35\u201303:50","dark_hours":4.74,"date":"2025-07-08","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":61.9,"score":70,"score_astronomy":70,"score_weather":100,"transit_alt":71.1,"transit_local":"02:15","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":1.92,"best_label":"good","best_window":"01:55\u201303:50","dark_hours":4.77,"date":"2025-07-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":55.1,"score":56,"score_astronomy":57,"score_weather":99,"transit_alt":71.1,"transit_local":"02:10","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":4.83,"best_label":"marginal","best_window":"23:05\u201303:55","dark_hours":4.81,"date":"2025-07-10","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":49.7,"score":39,"score_astronomy":48,"score_weather":81,"transit_alt":71.1,"transit_local":"02:05","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":1.92,"best_label":"marginal","best_window":"02:00\u201303:55","dark_hours":4.85,"date":"2025-07-11","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":46.2,"score":18,"score_astronomy":45,"score_weather":40,"transit_alt":71.1,"transit_local":"02:00","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":4.83,"best_label":"marginal","best_window":"23:05\u201303:55","dark_hours":4.88,"date":"2025-07-12","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":45.5,"score":41,"score_astronomy":48,"score_weather":86,"transit_alt":71.1,"transit_local":"02:00","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":1.0,"best_label":"marginal","best_window":"00:00\u201301:00","dark_hours":4.92,"date":"2025-07-13","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":47.7,"score":26,"score_astronomy":57,"score_weather":46,"transit_alt":71.1,"transit_local":"01:55","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":3.58,"best_label":"good","best_window":"23:00\u201302:35","dark_hours":4.97,"date":"2025-07-14","moon_free_dark_hours":0.28,"moon_illumination":82,"moon_separation":52.6,"score":95,"score_astronomy":95,"score_weather":100,"transit_alt":71.1,"transit_local":"01:50","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":4.25,"best_label":"good","best_window":"23:00\u201303:15","dark_hours":5.01,"date":"2025-07-15","moon_free_dark_hours":0.67,"moon_illumination":73,"moon_separation":59.6,"score":88,"score_astronomy":98,"score_weather":90,"transit_alt":71.1,"transit_local":"01:45","verdict":"good","weather_source":"history","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":"2025-06-16","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}}