{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":6.58,"best_label":"good","best_window":"21:20\u201303:55","dark_hours":11.47,"date":"2045-12-11","moon_free_dark_hours":10.52,"moon_illumination":12,"moon_separation":133.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.58,"best_label":"good","best_window":"21:15\u201303:50","dark_hours":11.47,"date":"2045-12-12","moon_free_dark_hours":9.47,"moon_illumination":18,"moon_separation":124.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:30","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.5,"best_label":"good","best_window":"21:15\u201303:45","dark_hours":11.48,"date":"2045-12-13","moon_free_dark_hours":8.43,"moon_illumination":26,"moon_separation":115.6,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.42,"best_label":"good","best_window":"21:15\u201303:40","dark_hours":11.49,"date":"2045-12-14","moon_free_dark_hours":7.4,"moon_illumination":35,"moon_separation":105.9,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"00:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.42,"best_label":"good","best_window":"21:15\u201303:40","dark_hours":11.49,"date":"2045-12-15","moon_free_dark_hours":6.42,"moon_illumination":44,"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":"Fri"},{"best_hours":6.25,"best_label":"good","best_window":"21:20\u201303:35","dark_hours":11.5,"date":"2045-12-16","moon_free_dark_hours":5.42,"moon_illumination":54,"moon_separation":86.0,"score":null,"score_astronomy":88,"score_weather":null,"transit_alt":42.9,"transit_local":"00:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.0,"best_label":"good","best_window":"21:30\u201303:30","dark_hours":11.5,"date":"2045-12-17","moon_free_dark_hours":4.4,"moon_illumination":63,"moon_separation":75.9,"score":null,"score_astronomy":86,"score_weather":null,"transit_alt":42.9,"transit_local":"00:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.17,"best_label":"good","best_window":"23:15\u201303:25","dark_hours":11.5,"date":"2045-12-18","moon_free_dark_hours":3.35,"moon_illumination":72,"moon_separation":65.9,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":42.9,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.17,"best_label":"marginal","best_window":"20:45\u201303:55","dark_hours":11.51,"date":"2045-12-19","moon_free_dark_hours":2.25,"moon_illumination":81,"moon_separation":55.9,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":42.9,"transit_local":"00:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.5,"best_label":"marginal","best_window":"21:05\u201303:35","dark_hours":11.51,"date":"2045-12-20","moon_free_dark_hours":1.1,"moon_illumination":88,"moon_separation":46.6,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":42.9,"transit_local":"00:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.25,"best_label":"marginal","best_window":"23:55\u201303:10","dark_hours":11.51,"date":"2045-12-21","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":38.6,"score":null,"score_astronomy":20,"score_weather":null,"transit_alt":42.9,"transit_local":"23:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.51,"date":"2045-12-22","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":33.5,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":42.9,"transit_local":"23:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":11.5,"date":"2045-12-23","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":33.1,"score":null,"score_astronomy":10,"score_weather":null,"transit_alt":42.9,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.58,"best_label":"marginal","best_window":"20:45\u201322:20","dark_hours":11.5,"date":"2045-12-24","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":37.9,"score":null,"score_astronomy":16,"score_weather":null,"transit_alt":42.9,"transit_local":"23:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.08,"best_label":"marginal","best_window":"20:10\u201302:15","dark_hours":11.5,"date":"2045-12-25","moon_free_dark_hours":0.03,"moon_illumination":95,"moon_separation":46.4,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":42.9,"transit_local":"23:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":7.0,"best_label":"marginal","best_window":"19:50\u201302:50","dark_hours":11.49,"date":"2045-12-26","moon_free_dark_hours":1.32,"moon_illumination":89,"moon_separation":57.0,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":42.9,"transit_local":"23:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.92,"best_label":"good","best_window":"20:15\u201300:10","dark_hours":11.49,"date":"2045-12-27","moon_free_dark_hours":2.62,"moon_illumination":80,"moon_separation":68.6,"score":null,"score_astronomy":82,"score_weather":null,"transit_alt":42.9,"transit_local":"23:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.0,"best_label":"good","best_window":"20:15\u201302:15","dark_hours":11.48,"date":"2045-12-28","moon_free_dark_hours":3.87,"moon_illumination":70,"moon_separation":80.6,"score":null,"score_astronomy":87,"score_weather":null,"transit_alt":42.9,"transit_local":"23:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.25,"best_label":"good","best_window":"20:10\u201302:25","dark_hours":11.48,"date":"2045-12-29","moon_free_dark_hours":5.07,"moon_illumination":59,"moon_separation":92.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.42,"best_label":"good","best_window":"20:05\u201302:30","dark_hours":11.47,"date":"2045-12-30","moon_free_dark_hours":6.28,"moon_illumination":48,"moon_separation":104.3,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.5,"best_label":"good","best_window":"20:00\u201302:30","dark_hours":11.46,"date":"2045-12-31","moon_free_dark_hours":7.48,"moon_illumination":37,"moon_separation":115.5,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.5,"best_label":"good","best_window":"20:00\u201302:30","dark_hours":11.45,"date":"2046-01-01","moon_free_dark_hours":8.68,"moon_illumination":27,"moon_separation":126.0,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.5,"best_label":"good","best_window":"19:55\u201302:25","dark_hours":11.44,"date":"2046-01-02","moon_free_dark_hours":9.85,"moon_illumination":18,"moon_separation":135.3,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":6.58,"best_label":"good","best_window":"19:50\u201302:25","dark_hours":11.43,"date":"2046-01-03","moon_free_dark_hours":10.97,"moon_illumination":11,"moon_separation":142.6,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":6.58,"best_label":"good","best_window":"19:45\u201302:20","dark_hours":11.41,"date":"2046-01-04","moon_free_dark_hours":11.4,"moon_illumination":5,"moon_separation":146.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"23:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":6.58,"best_label":"good","best_window":"19:40\u201302:15","dark_hours":11.4,"date":"2046-01-05","moon_free_dark_hours":11.38,"moon_illumination":2,"moon_separation":146.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":6.5,"best_label":"good","best_window":"19:40\u201302:10","dark_hours":11.39,"date":"2046-01-06","moon_free_dark_hours":11.37,"moon_illumination":0,"moon_separation":142.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":6.5,"best_label":"good","best_window":"19:35\u201302:05","dark_hours":11.37,"date":"2046-01-07","moon_free_dark_hours":11.35,"moon_illumination":1,"moon_separation":136.1,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":6.58,"best_label":"good","best_window":"19:30\u201302:05","dark_hours":11.36,"date":"2046-01-08","moon_free_dark_hours":11.33,"moon_illumination":3,"moon_separation":127.8,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":6.58,"best_label":"good","best_window":"19:25\u201302:00","dark_hours":11.34,"date":"2046-01-09","moon_free_dark_hours":10.77,"moon_illumination":7,"moon_separation":118.6,"score":null,"score_astronomy":89,"score_weather":null,"transit_alt":42.9,"transit_local":"22:40","verdict":"unknown","weather_source":"none","weekday":"Tue"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2045-12-11","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"}}