{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":3.33,"best_label":"good","best_window":"00:50\u201304:10","dark_hours":5.61,"date":"2041-05-14","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":77.8,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":87.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.17,"best_label":"good","best_window":"00:55\u201304:05","dark_hours":5.56,"date":"2041-05-15","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":73.5,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":87.1,"transit_local":"04:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.42,"best_label":"good","best_window":"00:40\u201304:05","dark_hours":5.51,"date":"2041-05-16","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":69.9,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":87.1,"transit_local":"04:20","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.83,"best_label":"good","best_window":"23:15\u201304:05","dark_hours":5.45,"date":"2041-05-17","moon_free_dark_hours":0.13,"moon_illumination":96,"moon_separation":67.4,"score":null,"score_astronomy":74,"score_weather":null,"transit_alt":87.1,"transit_local":"04:15","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.33,"best_label":"good","best_window":"22:40\u201304:00","dark_hours":5.4,"date":"2041-05-18","moon_free_dark_hours":1.23,"moon_illumination":90,"moon_separation":66.2,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":87.1,"transit_local":"04:10","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.33,"best_label":"good","best_window":"22:40\u201304:00","dark_hours":5.35,"date":"2041-05-19","moon_free_dark_hours":2.18,"moon_illumination":82,"moon_separation":66.5,"score":null,"score_astronomy":95,"score_weather":null,"transit_alt":87.1,"transit_local":"04:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.33,"best_label":"good","best_window":"22:40\u201304:00","dark_hours":5.3,"date":"2041-05-20","moon_free_dark_hours":2.95,"moon_illumination":72,"moon_separation":68.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"04:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":5.33,"best_label":"good","best_window":"22:40\u201304:00","dark_hours":5.25,"date":"2041-05-21","moon_free_dark_hours":3.57,"moon_illumination":62,"moon_separation":71.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"04:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":5.17,"best_label":"good","best_window":"22:45\u201303:55","dark_hours":5.2,"date":"2041-05-22","moon_free_dark_hours":4.05,"moon_illumination":50,"moon_separation":75.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":5.17,"best_label":"good","best_window":"22:45\u201303:55","dark_hours":5.16,"date":"2041-05-23","moon_free_dark_hours":4.47,"moon_illumination":39,"moon_separation":80.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.17,"best_label":"good","best_window":"22:45\u201303:55","dark_hours":5.11,"date":"2041-05-24","moon_free_dark_hours":4.85,"moon_illumination":28,"moon_separation":86.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:45","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":5.0,"best_label":"good","best_window":"22:50\u201303:50","dark_hours":5.07,"date":"2041-05-25","moon_free_dark_hours":5.05,"moon_illumination":18,"moon_separation":91.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":5.0,"best_label":"good","best_window":"22:50\u201303:50","dark_hours":5.02,"date":"2041-05-26","moon_free_dark_hours":5.0,"moon_illumination":10,"moon_separation":97.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.0,"best_label":"good","best_window":"22:50\u201303:50","dark_hours":4.98,"date":"2041-05-27","moon_free_dark_hours":4.97,"moon_illumination":5,"moon_separation":102.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.92,"best_label":"good","best_window":"22:55\u201303:50","dark_hours":4.94,"date":"2041-05-28","moon_free_dark_hours":4.92,"moon_illumination":1,"moon_separation":106.9,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.92,"best_label":"good","best_window":"22:55\u201303:50","dark_hours":4.9,"date":"2041-05-29","moon_free_dark_hours":4.88,"moon_illumination":0,"moon_separation":110.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.83,"best_label":"good","best_window":"22:55\u201303:45","dark_hours":4.86,"date":"2041-05-30","moon_free_dark_hours":4.85,"moon_illumination":1,"moon_separation":112.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.83,"best_label":"good","best_window":"22:55\u201303:45","dark_hours":4.82,"date":"2041-05-31","moon_free_dark_hours":4.8,"moon_illumination":4,"moon_separation":113.8,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.75,"best_label":"good","best_window":"23:00\u201303:45","dark_hours":4.78,"date":"2041-06-01","moon_free_dark_hours":4.18,"moon_illumination":9,"moon_separation":113.7,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.75,"best_label":"good","best_window":"23:00\u201303:45","dark_hours":4.75,"date":"2041-06-02","moon_free_dark_hours":3.43,"moon_illumination":16,"moon_separation":112.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.75,"best_label":"good","best_window":"23:00\u201303:45","dark_hours":4.71,"date":"2041-06-03","moon_free_dark_hours":2.83,"moon_illumination":23,"moon_separation":110.2,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.67,"best_label":"good","best_window":"23:00\u201303:40","dark_hours":4.68,"date":"2041-06-04","moon_free_dark_hours":2.33,"moon_illumination":32,"moon_separation":107.1,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.58,"best_label":"good","best_window":"23:05\u201303:40","dark_hours":4.65,"date":"2041-06-05","moon_free_dark_hours":1.92,"moon_illumination":41,"moon_separation":103.3,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"03:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":4.58,"best_label":"good","best_window":"23:05\u201303:40","dark_hours":4.62,"date":"2041-06-06","moon_free_dark_hours":1.53,"moon_illumination":50,"moon_separation":99.0,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"02:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":4.58,"best_label":"good","best_window":"23:05\u201303:40","dark_hours":4.6,"date":"2041-06-07","moon_free_dark_hours":1.18,"moon_illumination":60,"moon_separation":94.4,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"02:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":4.58,"best_label":"good","best_window":"23:05\u201303:40","dark_hours":4.57,"date":"2041-06-08","moon_free_dark_hours":0.87,"moon_illumination":69,"moon_separation":89.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"02:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.58,"best_label":"good","best_window":"23:05\u201303:40","dark_hours":4.55,"date":"2041-06-09","moon_free_dark_hours":0.5,"moon_illumination":78,"moon_separation":84.5,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"02:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.58,"best_label":"good","best_window":"23:05\u201303:40","dark_hours":4.53,"date":"2041-06-10","moon_free_dark_hours":0.13,"moon_illumination":86,"moon_separation":79.6,"score":null,"score_astronomy":100,"score_weather":null,"transit_alt":87.1,"transit_local":"02:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.51,"date":"2041-06-11","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":75.1,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":87.1,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":4.5,"best_label":"good","best_window":"23:10\u201303:40","dark_hours":4.49,"date":"2041-06-12","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":71.1,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":87.1,"transit_local":"02:35","verdict":"unknown","weather_source":"none","weekday":"Wed"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2041-05-14","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}}