{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":5.17,"best_label":"marginal","best_window":"23:20\u201304:30","dark_hours":11.4,"date":"2041-12-05","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":42.9,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":42.9,"transit_local":"01:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.0,"best_label":"marginal","best_window":"02:50\u201303:50","dark_hours":11.41,"date":"2041-12-06","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":35.7,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":42.9,"transit_local":"00:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.42,"date":"2041-12-07","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":32.5,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":42.9,"transit_local":"00:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.44,"date":"2041-12-08","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":34.1,"score":null,"score_astronomy":12,"score_weather":null,"transit_alt":42.9,"transit_local":"00:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.17,"best_label":"marginal","best_window":"21:35\u201300:45","dark_hours":11.45,"date":"2041-12-09","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":39.6,"score":null,"score_astronomy":19,"score_weather":null,"transit_alt":42.9,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"marginal","best_window":"21:05\u201303:35","dark_hours":11.46,"date":"2041-12-10","moon_free_dark_hours":0.78,"moon_illumination":89,"moon_separation":47.6,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":42.9,"transit_local":"00:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.08,"best_label":"marginal","best_window":"20:50\u201303:55","dark_hours":11.47,"date":"2041-12-11","moon_free_dark_hours":1.87,"moon_illumination":82,"moon_separation":56.6,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":42.9,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.33,"best_label":"good","best_window":"21:40\u201301:00","dark_hours":11.47,"date":"2041-12-12","moon_free_dark_hours":2.95,"moon_illumination":74,"moon_separation":66.3,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":42.9,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.75,"best_label":"good","best_window":"21:10\u201302:55","dark_hours":11.48,"date":"2041-12-13","moon_free_dark_hours":3.98,"moon_illumination":65,"moon_separation":76.1,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":42.9,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.17,"best_label":"good","best_window":"21:10\u201303:20","dark_hours":11.49,"date":"2041-12-14","moon_free_dark_hours":5.02,"moon_illumination":56,"moon_separation":86.1,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":42.9,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.33,"best_label":"good","best_window":"21:05\u201303:25","dark_hours":11.49,"date":"2041-12-15","moon_free_dark_hours":6.02,"moon_illumination":47,"moon_separation":96.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.42,"best_label":"good","best_window":"21:00\u201303:25","dark_hours":11.5,"date":"2041-12-16","moon_free_dark_hours":7.0,"moon_illumination":37,"moon_separation":106.0,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"good","best_window":"20:55\u201303:25","dark_hours":11.5,"date":"2041-12-17","moon_free_dark_hours":8.03,"moon_illumination":28,"moon_separation":115.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.5,"best_label":"good","best_window":"20:55\u201303:25","dark_hours":11.5,"date":"2041-12-18","moon_free_dark_hours":9.1,"moon_illumination":20,"moon_separation":125.4,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.5,"best_label":"good","best_window":"20:50\u201303:20","dark_hours":11.51,"date":"2041-12-19","moon_free_dark_hours":10.2,"moon_illumination":13,"moon_separation":134.3,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.58,"best_label":"good","best_window":"20:45\u201303:20","dark_hours":11.51,"date":"2041-12-20","moon_free_dark_hours":11.37,"moon_illumination":7,"moon_separation":141.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.58,"best_label":"good","best_window":"20:40\u201303:15","dark_hours":11.51,"date":"2041-12-21","moon_free_dark_hours":11.48,"moon_illumination":2,"moon_separation":146.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.58,"best_label":"good","best_window":"20:35\u201303:10","dark_hours":11.51,"date":"2041-12-22","moon_free_dark_hours":11.5,"moon_illumination":0,"moon_separation":147.2,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.5,"best_label":"good","best_window":"20:35\u201303:05","dark_hours":11.51,"date":"2041-12-23","moon_free_dark_hours":11.48,"moon_illumination":1,"moon_separation":142.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"good","best_window":"20:30\u201303:00","dark_hours":11.5,"date":"2041-12-24","moon_free_dark_hours":11.48,"moon_illumination":3,"moon_separation":134.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.58,"best_label":"good","best_window":"20:25\u201303:00","dark_hours":11.5,"date":"2041-12-25","moon_free_dark_hours":11.1,"moon_illumination":9,"moon_separation":124.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.58,"best_label":"good","best_window":"20:20\u201302:55","dark_hours":11.49,"date":"2041-12-26","moon_free_dark_hours":9.8,"moon_illumination":16,"moon_separation":113.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.5,"best_label":"good","best_window":"20:20\u201302:50","dark_hours":11.49,"date":"2041-12-27","moon_free_dark_hours":8.53,"moon_illumination":26,"moon_separation":101.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.33,"best_label":"good","best_window":"20:25\u201302:45","dark_hours":11.48,"date":"2041-12-28","moon_free_dark_hours":7.27,"moon_illumination":36,"moon_separation":89.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.25,"best_label":"good","best_window":"20:30\u201302:45","dark_hours":11.48,"date":"2041-12-29","moon_free_dark_hours":6.03,"moon_illumination":48,"moon_separation":77.7,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":42.9,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":5.67,"best_label":"good","best_window":"21:00\u201302:40","dark_hours":11.47,"date":"2041-12-30","moon_free_dark_hours":4.83,"moon_illumination":59,"moon_separation":66.2,"score":null,"score_astronomy":84,"score_weather":null,"transit_alt":42.9,"transit_local":"23:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"23:50\u201302:05","dark_hours":11.46,"date":"2041-12-31","moon_free_dark_hours":3.63,"moon_illumination":70,"moon_separation":55.2,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":42.9,"transit_local":"23:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.92,"best_label":"marginal","best_window":"20:00\u201302:55","dark_hours":11.45,"date":"2042-01-01","moon_free_dark_hours":2.42,"moon_illumination":79,"moon_separation":45.4,"score":null,"score_astronomy":41,"score_weather":null,"transit_alt":42.9,"transit_local":"23:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.08,"best_label":"marginal","best_window":"20:30\u201302:35","dark_hours":11.44,"date":"2042-01-02","moon_free_dark_hours":1.18,"moon_illumination":87,"moon_separation":37.6,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":42.9,"transit_local":"23:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.42,"best_label":"marginal","best_window":"01:30\u201301:55","dark_hours":11.43,"date":"2042-01-03","moon_free_dark_hours":0.02,"moon_illumination":94,"moon_separation":33.0,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":42.9,"transit_local":"23:05","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":"2041-12-05","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"}}
