{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.75,"best_label":"good","best_window":"04:15\u201306:00","dark_hours":10.76,"date":"2031-02-01","moon_free_dark_hours":2.35,"moon_illumination":74,"moon_separation":113.7,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":87.1,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.67,"best_label":"good","best_window":"04:20\u201306:00","dark_hours":10.73,"date":"2031-02-02","moon_free_dark_hours":1.53,"moon_illumination":82,"moon_separation":117.6,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":87.1,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.75,"best_label":"good","best_window":"04:15\u201306:00","dark_hours":10.7,"date":"2031-02-03","moon_free_dark_hours":0.78,"moon_illumination":88,"moon_separation":120.3,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":87.1,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.67,"best_label":"good","best_window":"04:15\u201305:55","dark_hours":10.66,"date":"2031-02-04","moon_free_dark_hours":0.12,"moon_illumination":94,"moon_separation":121.7,"score":null,"score_astronomy":44,"score_weather":null,"transit_alt":87.1,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.75,"best_label":"good","best_window":"04:10\u201305:55","dark_hours":10.63,"date":"2031-02-05","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":121.5,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":87.1,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.75,"best_label":"good","best_window":"04:10\u201305:55","dark_hours":10.59,"date":"2031-02-06","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":119.7,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":87.1,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.75,"best_label":"good","best_window":"04:10\u201305:55","dark_hours":10.56,"date":"2031-02-07","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":116.5,"score":null,"score_astronomy":39,"score_weather":null,"transit_alt":87.1,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.83,"best_label":"good","best_window":"04:05\u201305:55","dark_hours":10.52,"date":"2031-02-08","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":112.0,"score":null,"score_astronomy":38,"score_weather":null,"transit_alt":87.1,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.75,"best_label":"good","best_window":"04:05\u201305:50","dark_hours":10.48,"date":"2031-02-09","moon_free_dark_hours":0.78,"moon_illumination":94,"moon_separation":106.5,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":87.1,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.75,"best_label":"good","best_window":"04:05\u201305:50","dark_hours":10.45,"date":"2031-02-10","moon_free_dark_hours":1.83,"moon_illumination":88,"moon_separation":100.2,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":87.1,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.75,"best_label":"good","best_window":"04:05\u201305:50","dark_hours":10.41,"date":"2031-02-11","moon_free_dark_hours":2.9,"moon_illumination":81,"moon_separation":93.4,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":87.1,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":1.83,"best_label":"good","best_window":"04:00\u201305:50","dark_hours":10.37,"date":"2031-02-12","moon_free_dark_hours":4.0,"moon_illumination":72,"moon_separation":86.3,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":87.1,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":1.92,"best_label":"good","best_window":"03:50\u201305:45","dark_hours":10.33,"date":"2031-02-13","moon_free_dark_hours":5.12,"moon_illumination":61,"moon_separation":79.3,"score":null,"score_astronomy":37,"score_weather":null,"transit_alt":87.1,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.08,"best_label":"good","best_window":"03:40\u201305:45","dark_hours":10.29,"date":"2031-02-14","moon_free_dark_hours":6.22,"moon_illumination":50,"moon_separation":72.7,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":87.1,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.17,"best_label":"good","best_window":"03:35\u201305:45","dark_hours":10.25,"date":"2031-02-15","moon_free_dark_hours":7.27,"moon_illumination":39,"moon_separation":66.8,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":87.1,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.5,"best_label":"good","best_window":"03:15\u201305:45","dark_hours":10.21,"date":"2031-02-16","moon_free_dark_hours":8.25,"moon_illumination":28,"moon_separation":62.0,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":87.1,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"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"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2031-02-01","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}}