{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.45,"date":"2029-04-12","moon_free_dark_hours":7.43,"moon_illumination":1,"moon_separation":75.3,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.39,"date":"2029-04-13","moon_free_dark_hours":7.37,"moon_illumination":0,"moon_separation":65.3,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":42.9,"transit_local":"17:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.33,"date":"2029-04-14","moon_free_dark_hours":7.32,"moon_illumination":1,"moon_separation":55.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.28,"date":"2029-04-15","moon_free_dark_hours":7.17,"moon_illumination":4,"moon_separation":46.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.22,"date":"2029-04-16","moon_free_dark_hours":6.17,"moon_illumination":8,"moon_separation":38.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.16,"date":"2029-04-17","moon_free_dark_hours":5.18,"moon_illumination":14,"moon_separation":32.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.1,"date":"2029-04-18","moon_free_dark_hours":4.27,"moon_illumination":22,"moon_separation":29.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.05,"date":"2029-04-19","moon_free_dark_hours":3.45,"moon_illumination":31,"moon_separation":31.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.99,"date":"2029-04-20","moon_free_dark_hours":2.73,"moon_illumination":40,"moon_separation":37.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.93,"date":"2029-04-21","moon_free_dark_hours":2.1,"moon_illumination":51,"moon_separation":46.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"17:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.87,"date":"2029-04-22","moon_free_dark_hours":1.55,"moon_illumination":62,"moon_separation":57.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.81,"date":"2029-04-23","moon_free_dark_hours":1.02,"moon_illumination":73,"moon_separation":68.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.75,"date":"2029-04-24","moon_free_dark_hours":0.52,"moon_illumination":82,"moon_separation":81.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.7,"date":"2029-04-25","moon_free_dark_hours":0.0,"moon_illumination":90,"moon_separation":93.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.64,"date":"2029-04-26","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":106.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.58,"date":"2029-04-27","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":119.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.52,"date":"2029-04-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":131.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.46,"date":"2029-04-29","moon_free_dark_hours":0.03,"moon_illumination":97,"moon_separation":141.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.41,"date":"2029-04-30","moon_free_dark_hours":1.18,"moon_illumination":91,"moon_separation":148.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.35,"date":"2029-05-01","moon_free_dark_hours":2.13,"moon_illumination":84,"moon_separation":150.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.29,"date":"2029-05-02","moon_free_dark_hours":2.9,"moon_illumination":75,"moon_separation":146.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.23,"date":"2029-05-03","moon_free_dark_hours":3.53,"moon_illumination":65,"moon_separation":138.4,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.17,"date":"2029-05-04","moon_free_dark_hours":4.03,"moon_illumination":55,"moon_separation":129.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.12,"date":"2029-05-05","moon_free_dark_hours":4.47,"moon_illumination":45,"moon_separation":119.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.06,"date":"2029-05-06","moon_free_dark_hours":4.83,"moon_illumination":35,"moon_separation":108.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"16:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.0,"date":"2029-05-07","moon_free_dark_hours":5.18,"moon_illumination":26,"moon_separation":98.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.95,"date":"2029-05-08","moon_free_dark_hours":5.53,"moon_illumination":19,"moon_separation":88.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.89,"date":"2029-05-09","moon_free_dark_hours":5.88,"moon_illumination":12,"moon_separation":78.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.83,"date":"2029-05-10","moon_free_dark_hours":5.82,"moon_illumination":6,"moon_separation":67.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.78,"date":"2029-05-11","moon_free_dark_hours":5.77,"moon_illumination":3,"moon_separation":58.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":42.9,"transit_local":"15:40","verdict":"unknown","weather_source":"none","weekday":"Fri"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2029-04-12","target":{"common_name":"Great Orion Nebula","dec":-5.3876,"name":"M 42","ra":83.8201,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M42","source":"sesame","type":"HII","type_text":"HII region \u2014 a star-forming nebula"}}