{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.67,"best_label":"good","best_window":"18:40\u201319:20","dark_hours":11.5,"date":"2040-12-23","moon_free_dark_hours":2.97,"moon_illumination":75,"moon_separation":128.2,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":71.1,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.58,"best_label":"good","best_window":"18:40\u201319:15","dark_hours":11.5,"date":"2040-12-24","moon_free_dark_hours":3.98,"moon_illumination":67,"moon_separation":123.1,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":71.1,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"good","best_window":"18:40\u201319:10","dark_hours":11.5,"date":"2040-12-25","moon_free_dark_hours":5.0,"moon_illumination":58,"moon_separation":116.8,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":71.1,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.42,"best_label":"good","best_window":"18:40\u201319:05","dark_hours":11.49,"date":"2040-12-26","moon_free_dark_hours":6.02,"moon_illumination":48,"moon_separation":109.4,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":71.1,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.42,"best_label":"good","best_window":"18:40\u201319:05","dark_hours":11.49,"date":"2040-12-27","moon_free_dark_hours":7.08,"moon_illumination":38,"moon_separation":101.2,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":71.1,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.33,"best_label":"good","best_window":"18:40\u201319:00","dark_hours":11.48,"date":"2040-12-28","moon_free_dark_hours":8.18,"moon_illumination":28,"moon_separation":92.5,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":71.1,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.25,"best_label":"good","best_window":"18:40\u201318:55","dark_hours":11.47,"date":"2040-12-29","moon_free_dark_hours":9.35,"moon_illumination":19,"moon_separation":83.5,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":71.1,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"good","best_window":"18:40\u201318:50","dark_hours":11.47,"date":"2040-12-30","moon_free_dark_hours":10.6,"moon_illumination":11,"moon_separation":74.3,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.08,"best_label":"good","best_window":"18:45\u201318:50","dark_hours":11.46,"date":"2040-12-31","moon_free_dark_hours":11.45,"moon_illumination":5,"moon_separation":65.3,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":71.1,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.0,"best_label":"marginal","best_window":"18:10\u201319:10","dark_hours":11.45,"date":"2041-01-01","moon_free_dark_hours":11.43,"moon_illumination":1,"moon_separation":57.3,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":71.1,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.5,"best_label":"marginal","best_window":"18:10\u201318:40","dark_hours":11.44,"date":"2041-01-02","moon_free_dark_hours":11.42,"moon_illumination":0,"moon_separation":51.0,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":71.1,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.33,"best_label":"marginal","best_window":"18:45\u201319:05","dark_hours":11.42,"date":"2041-01-03","moon_free_dark_hours":11.4,"moon_illumination":2,"moon_separation":47.5,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":71.1,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.25,"best_label":"marginal","best_window":"18:45\u201319:00","dark_hours":11.41,"date":"2041-01-04","moon_free_dark_hours":11.23,"moon_illumination":7,"moon_separation":47.6,"score":null,"score_astronomy":4,"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":"18:45\u201318:55","dark_hours":11.4,"date":"2041-01-05","moon_free_dark_hours":9.88,"moon_illumination":14,"moon_separation":51.1,"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":0.0,"best_label":null,"best_window":null,"dark_hours":11.38,"date":"2041-01-06","moon_free_dark_hours":8.58,"moon_illumination":24,"moon_separation":57.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.37,"date":"2041-01-07","moon_free_dark_hours":7.33,"moon_illumination":34,"moon_separation":65.0,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.35,"date":"2041-01-08","moon_free_dark_hours":6.15,"moon_illumination":45,"moon_separation":73.6,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.34,"date":"2041-01-09","moon_free_dark_hours":5.0,"moon_illumination":56,"moon_separation":82.4,"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":11.32,"date":"2041-01-10","moon_free_dark_hours":3.87,"moon_illumination":66,"moon_separation":91.3,"score":null,"score_astronomy":0,"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":11.3,"date":"2041-01-11","moon_free_dark_hours":2.75,"moon_illumination":75,"moon_separation":100.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.28,"date":"2041-01-12","moon_free_dark_hours":1.63,"moon_illumination":83,"moon_separation":108.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.26,"date":"2041-01-13","moon_free_dark_hours":0.58,"moon_illumination":90,"moon_separation":115.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.24,"date":"2041-01-14","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":122.4,"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":11.22,"date":"2041-01-15","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":127.7,"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":11.2,"date":"2041-01-16","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":131.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.17,"date":"2041-01-17","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":132.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.15,"date":"2041-01-18","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":132.2,"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":11.12,"date":"2041-01-19","moon_free_dark_hours":0.43,"moon_illumination":94,"moon_separation":129.4,"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":11.1,"date":"2041-01-20","moon_free_dark_hours":1.45,"moon_illumination":88,"moon_separation":124.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.07,"date":"2041-01-21","moon_free_dark_hours":2.45,"moon_illumination":82,"moon_separation":118.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:20","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":"2040-12-23","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}}
