{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.42,"best_label":"good","best_window":"03:15\u201305:40","dark_hours":10.17,"date":"2031-02-17","moon_free_dark_hours":9.13,"moon_illumination":18,"moon_separation":59.0,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":87.1,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.5,"best_label":"good","best_window":"03:10\u201305:40","dark_hours":10.13,"date":"2031-02-18","moon_free_dark_hours":9.88,"moon_illumination":10,"moon_separation":58.2,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":87.1,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.58,"best_label":"good","best_window":"03:05\u201305:40","dark_hours":10.09,"date":"2031-02-19","moon_free_dark_hours":10.08,"moon_illumination":4,"moon_separation":59.6,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":87.1,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"03:00\u201305:40","dark_hours":10.05,"date":"2031-02-20","moon_free_dark_hours":10.03,"moon_illumination":1,"moon_separation":63.1,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":87.1,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.67,"best_label":"good","best_window":"02:55\u201305:35","dark_hours":10.01,"date":"2031-02-21","moon_free_dark_hours":9.98,"moon_illumination":0,"moon_separation":68.3,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":87.1,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.67,"best_label":"good","best_window":"02:55\u201305:35","dark_hours":9.96,"date":"2031-02-22","moon_free_dark_hours":9.95,"moon_illumination":2,"moon_separation":74.5,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":87.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.75,"best_label":"good","best_window":"02:50\u201305:35","dark_hours":9.92,"date":"2031-02-23","moon_free_dark_hours":9.17,"moon_illumination":7,"moon_separation":81.2,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":87.1,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.83,"best_label":"good","best_window":"02:45\u201305:35","dark_hours":9.88,"date":"2031-02-24","moon_free_dark_hours":8.05,"moon_illumination":13,"moon_separation":88.2,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":87.1,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"02:40\u201305:30","dark_hours":9.83,"date":"2031-02-25","moon_free_dark_hours":6.93,"moon_illumination":20,"moon_separation":95.0,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":87.1,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.92,"best_label":"good","best_window":"02:35\u201305:30","dark_hours":9.79,"date":"2031-02-26","moon_free_dark_hours":5.9,"moon_illumination":29,"moon_separation":101.5,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":87.1,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"02:35\u201305:30","dark_hours":9.75,"date":"2031-02-27","moon_free_dark_hours":4.88,"moon_illumination":38,"moon_separation":107.3,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":87.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.92,"best_label":"good","best_window":"02:30\u201305:25","dark_hours":9.7,"date":"2031-02-28","moon_free_dark_hours":3.95,"moon_illumination":48,"moon_separation":112.5,"score":null,"score_astronomy":75,"score_weather":null,"transit_alt":87.1,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.0,"best_label":"good","best_window":"02:25\u201305:25","dark_hours":9.66,"date":"2031-03-01","moon_free_dark_hours":3.08,"moon_illumination":57,"moon_separation":116.7,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":87.1,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"02:25\u201305:25","dark_hours":9.61,"date":"2031-03-02","moon_free_dark_hours":2.3,"moon_illumination":66,"moon_separation":119.8,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":87.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.92,"best_label":"good","best_window":"02:25\u201305:20","dark_hours":9.56,"date":"2031-03-03","moon_free_dark_hours":1.6,"moon_illumination":75,"moon_separation":121.6,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":87.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.92,"best_label":"good","best_window":"02:25\u201305:20","dark_hours":9.52,"date":"2031-03-04","moon_free_dark_hours":0.95,"moon_illumination":83,"moon_separation":121.8,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":87.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.0,"best_label":"good","best_window":"02:20\u201305:20","dark_hours":9.47,"date":"2031-03-05","moon_free_dark_hours":0.4,"moon_illumination":89,"moon_separation":120.5,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":87.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"02:20\u201305:15","dark_hours":9.42,"date":"2031-03-06","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":117.7,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":87.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.92,"best_label":"good","best_window":"02:20\u201305:15","dark_hours":9.38,"date":"2031-03-07","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":113.5,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":87.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.92,"best_label":"good","best_window":"02:20\u201305:15","dark_hours":9.33,"date":"2031-03-08","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":108.2,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":87.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.83,"best_label":"good","best_window":"02:20\u201305:10","dark_hours":9.28,"date":"2031-03-09","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":101.9,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":87.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.58,"best_label":"good","best_window":"02:35\u201305:10","dark_hours":9.23,"date":"2031-03-10","moon_free_dark_hours":0.22,"moon_illumination":96,"moon_separation":95.1,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":87.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.42,"best_label":"good","best_window":"02:45\u201305:10","dark_hours":9.18,"date":"2031-03-11","moon_free_dark_hours":1.32,"moon_illumination":91,"moon_separation":87.9,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":87.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.42,"best_label":"good","best_window":"02:40\u201305:05","dark_hours":9.14,"date":"2031-03-12","moon_free_dark_hours":2.43,"moon_illumination":84,"moon_separation":80.7,"score":null,"score_astronomy":47,"score_weather":null,"transit_alt":87.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.92,"best_label":"good","best_window":"02:10\u201305:05","dark_hours":9.09,"date":"2031-03-13","moon_free_dark_hours":3.55,"moon_illumination":75,"moon_separation":73.9,"score":null,"score_astronomy":49,"score_weather":null,"transit_alt":87.1,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.08,"best_label":"good","best_window":"02:00\u201305:05","dark_hours":9.04,"date":"2031-03-14","moon_free_dark_hours":4.63,"moon_illumination":65,"moon_separation":67.8,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":87.1,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.25,"best_label":"good","best_window":"01:45\u201305:00","dark_hours":8.99,"date":"2031-03-15","moon_free_dark_hours":5.62,"moon_illumination":54,"moon_separation":62.8,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":87.1,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.58,"best_label":"good","best_window":"01:25\u201305:00","dark_hours":8.94,"date":"2031-03-16","moon_free_dark_hours":6.5,"moon_illumination":42,"moon_separation":59.4,"score":null,"score_astronomy":70,"score_weather":null,"transit_alt":87.1,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.67,"best_label":"good","best_window":"01:20\u201305:00","dark_hours":8.89,"date":"2031-03-17","moon_free_dark_hours":7.27,"moon_illumination":31,"moon_separation":58.0,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":87.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.58,"best_label":"good","best_window":"01:20\u201304:55","dark_hours":8.84,"date":"2031-03-18","moon_free_dark_hours":7.93,"moon_illumination":21,"moon_separation":58.8,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":87.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2031-02-17","target":{"common_name":"Vega","dec":38.78368896,"name":"* alf Lyr","ra":279.23473479,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=Vega","source":"sesame","spectral_type":"A0V","type":"dS*","type_text":"delta Scuti variable","vmag":0.03}}
