{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.17,"best_label":"good","best_window":"18:35\u201319:45","dark_hours":11.5,"date":"2039-12-17","moon_free_dark_hours":11.38,"moon_illumination":8,"moon_separation":47.0,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"14:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.0,"best_label":"good","best_window":"18:35\u201319:35","dark_hours":11.5,"date":"2039-12-18","moon_free_dark_hours":10.13,"moon_illumination":15,"moon_separation":46.8,"score":null,"score_astronomy":27,"score_weather":null,"transit_alt":71.1,"transit_local":"14:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.92,"best_label":"good","best_window":"18:35\u201319:30","dark_hours":11.51,"date":"2039-12-19","moon_free_dark_hours":8.88,"moon_illumination":24,"moon_separation":50.0,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":71.1,"transit_local":"14:30","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.75,"best_label":"good","best_window":"18:35\u201319:20","dark_hours":11.51,"date":"2039-12-20","moon_free_dark_hours":7.67,"moon_illumination":34,"moon_separation":55.6,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":71.1,"transit_local":"14:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.58,"best_label":"good","best_window":"18:35\u201319:10","dark_hours":11.51,"date":"2039-12-21","moon_free_dark_hours":6.52,"moon_illumination":45,"moon_separation":62.7,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":71.1,"transit_local":"14:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.42,"best_label":"good","best_window":"18:35\u201319:00","dark_hours":11.51,"date":"2039-12-22","moon_free_dark_hours":5.42,"moon_illumination":55,"moon_separation":70.6,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":71.1,"transit_local":"14:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"18:40\u201318:45","dark_hours":11.51,"date":"2039-12-23","moon_free_dark_hours":4.37,"moon_illumination":65,"moon_separation":78.9,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":71.1,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"good","best_window":"18:40\u201318:45","dark_hours":11.5,"date":"2039-12-24","moon_free_dark_hours":3.33,"moon_illumination":74,"moon_separation":87.4,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"good","best_window":"18:40\u201318:50","dark_hours":11.5,"date":"2039-12-25","moon_free_dark_hours":2.32,"moon_illumination":82,"moon_separation":95.7,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.17,"best_label":"good","best_window":"18:40\u201318:50","dark_hours":11.5,"date":"2039-12-26","moon_free_dark_hours":1.3,"moon_illumination":89,"moon_separation":103.9,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.17,"best_label":"good","best_window":"18:40\u201318:50","dark_hours":11.49,"date":"2039-12-27","moon_free_dark_hours":0.28,"moon_illumination":94,"moon_separation":111.6,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.17,"best_label":"good","best_window":"18:40\u201318:50","dark_hours":11.49,"date":"2039-12-28","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":118.7,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":71.1,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.17,"best_label":"good","best_window":"18:40\u201318:50","dark_hours":11.48,"date":"2039-12-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":124.8,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":71.1,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"18:40\u201318:45","dark_hours":11.47,"date":"2039-12-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":129.7,"score":null,"score_astronomy":9,"score_weather":null,"transit_alt":71.1,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.17,"best_label":"marginal","best_window":"18:10\u201319:20","dark_hours":11.46,"date":"2039-12-31","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":132.7,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":71.1,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.08,"best_label":"marginal","best_window":"18:10\u201319:15","dark_hours":11.45,"date":"2040-01-01","moon_free_dark_hours":0.08,"moon_illumination":95,"moon_separation":133.5,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":71.1,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.0,"best_label":"marginal","best_window":"18:10\u201319:10","dark_hours":11.44,"date":"2040-01-02","moon_free_dark_hours":1.08,"moon_illumination":90,"moon_separation":132.0,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":71.1,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"marginal","best_window":"18:10\u201318:40","dark_hours":11.43,"date":"2040-01-03","moon_free_dark_hours":2.1,"moon_illumination":83,"moon_separation":128.3,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":71.1,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.42,"best_label":"marginal","best_window":"18:10\u201318:35","dark_hours":11.42,"date":"2040-01-04","moon_free_dark_hours":3.15,"moon_illumination":75,"moon_separation":122.7,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":71.1,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.25,"best_label":"marginal","best_window":"18:45\u201319:00","dark_hours":11.41,"date":"2040-01-05","moon_free_dark_hours":4.2,"moon_illumination":66,"moon_separation":115.7,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":71.1,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"marginal","best_window":"18:45\u201318:55","dark_hours":11.39,"date":"2040-01-06","moon_free_dark_hours":5.28,"moon_illumination":56,"moon_separation":107.7,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":71.1,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"18:15\u201318:25","dark_hours":11.38,"date":"2040-01-07","moon_free_dark_hours":6.4,"moon_illumination":45,"moon_separation":98.8,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":71.1,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"marginal","best_window":"18:15\u201318:20","dark_hours":11.36,"date":"2040-01-08","moon_free_dark_hours":7.57,"moon_illumination":34,"moon_separation":89.4,"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":11.35,"date":"2040-01-09","moon_free_dark_hours":8.78,"moon_illumination":24,"moon_separation":79.8,"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":11.33,"date":"2040-01-10","moon_free_dark_hours":10.07,"moon_illumination":15,"moon_separation":70.2,"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":11.31,"date":"2040-01-11","moon_free_dark_hours":11.3,"moon_illumination":7,"moon_separation":61.2,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.29,"date":"2040-01-12","moon_free_dark_hours":11.28,"moon_illumination":2,"moon_separation":53.6,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":71.1,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.27,"date":"2040-01-13","moon_free_dark_hours":11.25,"moon_illumination":0,"moon_separation":48.3,"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":11.25,"date":"2040-01-14","moon_free_dark_hours":11.23,"moon_illumination":1,"moon_separation":46.4,"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":11.23,"date":"2040-01-15","moon_free_dark_hours":11.22,"moon_illumination":5,"moon_separation":48.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":71.1,"transit_local":"12:45","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":"2039-12-17","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}}
