{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.08,"best_label":"good","best_window":"04:15\u201305:20","dark_hours":7.84,"date":"2037-04-05","moon_free_dark_hours":4.22,"moon_illumination":65,"moon_separation":53.0,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":71.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.67,"best_label":"good","best_window":"03:40\u201305:20","dark_hours":7.79,"date":"2037-04-06","moon_free_dark_hours":5.08,"moon_illumination":55,"moon_separation":47.1,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.75,"best_label":"good","best_window":"03:30\u201305:15","dark_hours":7.73,"date":"2037-04-07","moon_free_dark_hours":5.87,"moon_illumination":46,"moon_separation":43.4,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"good","best_window":"03:10\u201305:15","dark_hours":7.67,"date":"2037-04-08","moon_free_dark_hours":6.52,"moon_illumination":36,"moon_separation":42.3,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.17,"best_label":"good","best_window":"03:05\u201305:15","dark_hours":7.62,"date":"2037-04-09","moon_free_dark_hours":7.1,"moon_illumination":27,"moon_separation":44.0,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.08,"best_label":"good","best_window":"03:05\u201305:10","dark_hours":7.56,"date":"2037-04-10","moon_free_dark_hours":7.53,"moon_illumination":19,"moon_separation":48.0,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.17,"best_label":"good","best_window":"03:00\u201305:10","dark_hours":7.5,"date":"2037-04-11","moon_free_dark_hours":7.48,"moon_illumination":12,"moon_separation":53.8,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.17,"best_label":"good","best_window":"02:55\u201305:05","dark_hours":7.45,"date":"2037-04-12","moon_free_dark_hours":7.43,"moon_illumination":7,"moon_separation":60.9,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.25,"best_label":"good","best_window":"02:50\u201305:05","dark_hours":7.39,"date":"2037-04-13","moon_free_dark_hours":7.37,"moon_illumination":3,"moon_separation":68.8,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.33,"best_label":"good","best_window":"02:45\u201305:05","dark_hours":7.33,"date":"2037-04-14","moon_free_dark_hours":7.32,"moon_illumination":1,"moon_separation":77.4,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.25,"best_label":"good","best_window":"02:45\u201305:00","dark_hours":7.27,"date":"2037-04-15","moon_free_dark_hours":7.25,"moon_illumination":0,"moon_separation":86.3,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.33,"best_label":"good","best_window":"02:40\u201305:00","dark_hours":7.22,"date":"2037-04-16","moon_free_dark_hours":7.2,"moon_illumination":2,"moon_separation":95.5,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":71.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.33,"best_label":"good","best_window":"02:35\u201304:55","dark_hours":7.16,"date":"2037-04-17","moon_free_dark_hours":7.13,"moon_illumination":5,"moon_separation":104.7,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":7.1,"date":"2037-04-18","moon_free_dark_hours":6.07,"moon_illumination":11,"moon_separation":113.6,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"02:30\u201304:55","dark_hours":7.04,"date":"2037-04-19","moon_free_dark_hours":5.02,"moon_illumination":18,"moon_separation":122.0,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":71.1,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.42,"best_label":"good","best_window":"02:25\u201304:50","dark_hours":6.98,"date":"2037-04-20","moon_free_dark_hours":3.98,"moon_illumination":27,"moon_separation":129.3,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"good","best_window":"02:20\u201304:50","dark_hours":6.93,"date":"2037-04-21","moon_free_dark_hours":3.0,"moon_illumination":37,"moon_separation":134.8,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":71.1,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.5,"best_label":"good","best_window":"02:20\u201304:50","dark_hours":6.87,"date":"2037-04-22","moon_free_dark_hours":2.12,"moon_illumination":48,"moon_separation":137.4,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.5,"best_label":"good","best_window":"02:15\u201304:45","dark_hours":6.81,"date":"2037-04-23","moon_free_dark_hours":1.33,"moon_illumination":59,"moon_separation":136.5,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":71.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.5,"best_label":"good","best_window":"02:15\u201304:45","dark_hours":6.75,"date":"2037-04-24","moon_free_dark_hours":0.62,"moon_illumination":70,"moon_separation":132.1,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":71.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.5,"best_label":"good","best_window":"02:10\u201304:40","dark_hours":6.69,"date":"2037-04-25","moon_free_dark_hours":0.0,"moon_illumination":80,"moon_separation":124.9,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.5,"best_label":"good","best_window":"02:10\u201304:40","dark_hours":6.64,"date":"2037-04-26","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":115.9,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.42,"best_label":"good","best_window":"02:15\u201304:40","dark_hours":6.58,"date":"2037-04-27","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":105.7,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":71.1,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.08,"best_label":"good","best_window":"02:30\u201304:35","dark_hours":6.52,"date":"2037-04-28","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":95.1,"score":null,"score_astronomy":42,"score_weather":null,"transit_alt":71.1,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.33,"best_label":"good","best_window":"03:15\u201304:35","dark_hours":6.46,"date":"2037-04-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":84.4,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.67,"best_label":"good","best_window":"03:55\u201304:35","dark_hours":6.4,"date":"2037-04-30","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":74.1,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"04:25\u201304:30","dark_hours":6.34,"date":"2037-05-01","moon_free_dark_hours":0.23,"moon_illumination":94,"moon_separation":64.5,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.25,"best_label":"marginal","best_window":"01:15\u201304:30","dark_hours":6.29,"date":"2037-05-02","moon_free_dark_hours":1.28,"moon_illumination":88,"moon_separation":56.1,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.17,"best_label":"good","best_window":"04:15\u201304:25","dark_hours":6.23,"date":"2037-05-03","moon_free_dark_hours":2.23,"moon_illumination":80,"moon_separation":49.3,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.75,"best_label":"good","best_window":"02:40\u201304:25","dark_hours":6.17,"date":"2037-05-04","moon_free_dark_hours":3.07,"moon_illumination":72,"moon_separation":44.6,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"06:30","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":"2037-04-05","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}}
