{"calculation_version":"2026-10-10.1","days":30,"nights":[{"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"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.41,"date":"2042-01-04","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":33.0,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"23:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.08,"best_label":"marginal","best_window":"20:15\u201320:20","dark_hours":11.4,"date":"2042-01-05","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":37.3,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":42.9,"transit_local":"22:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.83,"best_label":"marginal","best_window":"19:35\u201323:25","dark_hours":11.39,"date":"2042-01-06","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":44.5,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":42.9,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.42,"best_label":"marginal","best_window":"19:15\u201301:40","dark_hours":11.37,"date":"2042-01-07","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":53.3,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":42.9,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":7.0,"best_label":"marginal","best_window":"19:00\u201302:00","dark_hours":11.36,"date":"2042-01-08","moon_free_dark_hours":0.42,"moon_illumination":93,"moon_separation":62.8,"score":null,"score_astronomy":50,"score_weather":null,"transit_alt":42.9,"transit_local":"22:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.58,"best_label":"good","best_window":"19:25\u201323:00","dark_hours":11.34,"date":"2042-01-09","moon_free_dark_hours":1.48,"moon_illumination":88,"moon_separation":72.7,"score":null,"score_astronomy":82,"score_weather":null,"transit_alt":42.9,"transit_local":"22:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":5.5,"best_label":"good","best_window":"19:20\u201300:50","dark_hours":11.32,"date":"2042-01-10","moon_free_dark_hours":2.52,"moon_illumination":81,"moon_separation":82.7,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":42.9,"transit_local":"22:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.08,"best_label":"good","best_window":"19:20\u201301:25","dark_hours":11.3,"date":"2042-01-11","moon_free_dark_hours":3.52,"moon_illumination":73,"moon_separation":92.7,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.33,"best_label":"good","best_window":"19:15\u201301:35","dark_hours":11.28,"date":"2042-01-12","moon_free_dark_hours":4.5,"moon_illumination":64,"moon_separation":102.6,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.42,"best_label":"good","best_window":"19:10\u201301:35","dark_hours":11.26,"date":"2042-01-13","moon_free_dark_hours":5.48,"moon_illumination":55,"moon_separation":112.4,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"good","best_window":"19:05\u201301:35","dark_hours":11.24,"date":"2042-01-14","moon_free_dark_hours":6.5,"moon_illumination":46,"moon_separation":122.0,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.5,"best_label":"good","best_window":"19:05\u201301:35","dark_hours":11.22,"date":"2042-01-15","moon_free_dark_hours":7.57,"moon_illumination":36,"moon_separation":131.0,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.5,"best_label":"good","best_window":"19:00\u201301:30","dark_hours":11.2,"date":"2042-01-16","moon_free_dark_hours":8.67,"moon_illumination":27,"moon_separation":139.0,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.5,"best_label":"good","best_window":"19:00\u201301:30","dark_hours":11.18,"date":"2042-01-17","moon_free_dark_hours":9.82,"moon_illumination":18,"moon_separation":145.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.42,"best_label":"good","best_window":"19:00\u201301:25","dark_hours":11.15,"date":"2042-01-18","moon_free_dark_hours":10.95,"moon_illumination":11,"moon_separation":147.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:05","verdict":"unknown","weather_source":"none","weekday":"Sat"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2041-12-20","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"}}
