{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.25,"best_label":"marginal","best_window":"18:15\u201318:30","dark_hours":11.4,"date":"2046-01-05","moon_free_dark_hours":11.38,"moon_illumination":2,"moon_separation":56.8,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":71.1,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"18:15\u201318:25","dark_hours":11.39,"date":"2046-01-06","moon_free_dark_hours":11.37,"moon_illumination":0,"moon_separation":50.1,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":71.1,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"marginal","best_window":"18:15\u201318:20","dark_hours":11.37,"date":"2046-01-07","moon_free_dark_hours":11.35,"moon_illumination":1,"moon_separation":45.2,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":71.1,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.36,"date":"2046-01-08","moon_free_dark_hours":11.33,"moon_illumination":3,"moon_separation":42.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.34,"date":"2046-01-09","moon_free_dark_hours":10.77,"moon_illumination":7,"moon_separation":42.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.32,"date":"2046-01-10","moon_free_dark_hours":9.73,"moon_illumination":12,"moon_separation":45.6,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.3,"date":"2046-01-11","moon_free_dark_hours":8.72,"moon_illumination":19,"moon_separation":50.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.28,"date":"2046-01-12","moon_free_dark_hours":7.7,"moon_illumination":27,"moon_separation":56.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.26,"date":"2046-01-13","moon_free_dark_hours":6.7,"moon_illumination":36,"moon_separation":64.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.24,"date":"2046-01-14","moon_free_dark_hours":5.67,"moon_illumination":45,"moon_separation":72.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.22,"date":"2046-01-15","moon_free_dark_hours":4.6,"moon_illumination":55,"moon_separation":81.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.2,"date":"2046-01-16","moon_free_dark_hours":3.48,"moon_illumination":65,"moon_separation":90.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.18,"date":"2046-01-17","moon_free_dark_hours":2.33,"moon_illumination":75,"moon_separation":100.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.15,"date":"2046-01-18","moon_free_dark_hours":1.22,"moon_illumination":83,"moon_separation":109.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.13,"date":"2046-01-19","moon_free_dark_hours":0.15,"moon_illumination":91,"moon_separation":119.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.1,"date":"2046-01-20","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":127.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.08,"date":"2046-01-21","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":134.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.05,"date":"2046-01-22","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":137.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.02,"date":"2046-01-23","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":136.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.0,"date":"2046-01-24","moon_free_dark_hours":1.12,"moon_illumination":92,"moon_separation":131.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.97,"date":"2046-01-25","moon_free_dark_hours":2.38,"moon_illumination":84,"moon_separation":124.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.94,"date":"2046-01-26","moon_free_dark_hours":3.63,"moon_illumination":74,"moon_separation":115.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.91,"date":"2046-01-27","moon_free_dark_hours":4.87,"moon_illumination":64,"moon_separation":105.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.88,"date":"2046-01-28","moon_free_dark_hours":6.08,"moon_illumination":53,"moon_separation":95.4,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.85,"date":"2046-01-29","moon_free_dark_hours":7.28,"moon_illumination":42,"moon_separation":85.5,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.82,"date":"2046-01-30","moon_free_dark_hours":8.42,"moon_illumination":32,"moon_separation":75.9,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.79,"date":"2046-01-31","moon_free_dark_hours":9.43,"moon_illumination":22,"moon_separation":66.9,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.75,"date":"2046-02-01","moon_free_dark_hours":10.3,"moon_illumination":15,"moon_separation":58.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.72,"date":"2046-02-02","moon_free_dark_hours":10.72,"moon_illumination":8,"moon_separation":51.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"marginal","best_window":"05:55\u201306:00","dark_hours":10.69,"date":"2046-02-03","moon_free_dark_hours":10.67,"moon_illumination":4,"moon_separation":46.3,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":71.1,"transit_local":"11:25","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":"2046-01-05","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}}