{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.04,"date":"2027-01-23","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":136.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.01,"date":"2027-01-24","moon_free_dark_hours":1.12,"moon_illumination":92,"moon_separation":131.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.98,"date":"2027-01-25","moon_free_dark_hours":2.35,"moon_illumination":84,"moon_separation":124.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.95,"date":"2027-01-26","moon_free_dark_hours":3.52,"moon_illumination":75,"moon_separation":116.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.92,"date":"2027-01-27","moon_free_dark_hours":4.67,"moon_illumination":65,"moon_separation":107.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"11:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.89,"date":"2027-01-28","moon_free_dark_hours":5.78,"moon_illumination":55,"moon_separation":97.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.86,"date":"2027-01-29","moon_free_dark_hours":6.88,"moon_illumination":45,"moon_separation":88.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.83,"date":"2027-01-30","moon_free_dark_hours":7.95,"moon_illumination":36,"moon_separation":79.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.8,"date":"2027-01-31","moon_free_dark_hours":8.97,"moon_illumination":27,"moon_separation":71.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.77,"date":"2027-02-01","moon_free_dark_hours":9.85,"moon_illumination":19,"moon_separation":63.3,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.73,"date":"2027-02-02","moon_free_dark_hours":10.63,"moon_illumination":12,"moon_separation":56.1,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"11:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.08,"best_label":"marginal","best_window":"05:55\u201306:00","dark_hours":10.7,"date":"2027-02-03","moon_free_dark_hours":10.68,"moon_illumination":7,"moon_separation":50.0,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":71.1,"transit_local":"11:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.17,"best_label":"marginal","best_window":"06:20\u201306:30","dark_hours":10.66,"date":"2027-02-04","moon_free_dark_hours":10.65,"moon_illumination":3,"moon_separation":45.5,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":71.1,"transit_local":"11:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.25,"best_label":"marginal","best_window":"06:15\u201306:30","dark_hours":10.63,"date":"2027-02-05","moon_free_dark_hours":10.62,"moon_illumination":0,"moon_separation":43.2,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":71.1,"transit_local":"11:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.25,"best_label":"marginal","best_window":"06:15\u201306:30","dark_hours":10.59,"date":"2027-02-06","moon_free_dark_hours":10.57,"moon_illumination":0,"moon_separation":43.5,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":71.1,"transit_local":"11:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.25,"best_label":"marginal","best_window":"05:40\u201305:55","dark_hours":10.56,"date":"2027-02-07","moon_free_dark_hours":10.53,"moon_illumination":2,"moon_separation":46.5,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":71.1,"transit_local":"11:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.25,"best_label":"marginal","best_window":"05:40\u201305:55","dark_hours":10.52,"date":"2027-02-08","moon_free_dark_hours":10.22,"moon_illumination":5,"moon_separation":51.6,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":71.1,"transit_local":"11:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"marginal","best_window":"06:00\u201306:25","dark_hours":10.49,"date":"2027-02-09","moon_free_dark_hours":9.13,"moon_illumination":10,"moon_separation":58.5,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":71.1,"transit_local":"11:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.5,"best_label":"marginal","best_window":"05:55\u201306:25","dark_hours":10.45,"date":"2027-02-10","moon_free_dark_hours":8.05,"moon_illumination":17,"moon_separation":66.5,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":71.1,"transit_local":"11:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.42,"best_label":"marginal","best_window":"05:25\u201305:50","dark_hours":10.41,"date":"2027-02-11","moon_free_dark_hours":6.92,"moon_illumination":25,"moon_separation":75.4,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":71.1,"transit_local":"10:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.0,"best_label":"marginal","best_window":"05:20\u201306:20","dark_hours":10.37,"date":"2027-02-12","moon_free_dark_hours":5.73,"moon_illumination":35,"moon_separation":84.9,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":71.1,"transit_local":"10:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.0,"best_label":"marginal","best_window":"05:20\u201306:20","dark_hours":10.33,"date":"2027-02-13","moon_free_dark_hours":4.5,"moon_illumination":46,"moon_separation":94.7,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":71.1,"transit_local":"10:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"good","best_window":"05:40\u201305:45","dark_hours":10.3,"date":"2027-02-14","moon_free_dark_hours":3.27,"moon_illumination":57,"moon_separation":104.6,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":71.1,"transit_local":"10:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"good","best_window":"05:35\u201305:45","dark_hours":10.26,"date":"2027-02-15","moon_free_dark_hours":2.1,"moon_illumination":68,"moon_separation":114.3,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":71.1,"transit_local":"10:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.17,"best_label":"good","best_window":"05:35\u201305:45","dark_hours":10.22,"date":"2027-02-16","moon_free_dark_hours":1.07,"moon_illumination":78,"moon_separation":123.3,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"10:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.17,"best_label":"good","best_window":"05:30\u201305:40","dark_hours":10.18,"date":"2027-02-17","moon_free_dark_hours":0.18,"moon_illumination":87,"moon_separation":130.8,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"10:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.08,"best_label":"good","best_window":"05:35\u201305:40","dark_hours":10.13,"date":"2027-02-18","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":135.7,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"good","best_window":"05:30\u201305:40","dark_hours":10.09,"date":"2027-02-19","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":136.9,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"10:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.25,"best_label":"good","best_window":"05:25\u201305:40","dark_hours":10.05,"date":"2027-02-20","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":134.0,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"10:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"good","best_window":"05:25\u201305:35","dark_hours":10.01,"date":"2027-02-21","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":127.9,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2027-01-23","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}}