{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":4.17,"best_label":"good","best_window":"19:25\u201323:35","dark_hours":10.37,"date":"2027-02-12","moon_free_dark_hours":5.73,"moon_illumination":35,"moon_separation":56.0,"score":null,"score_astronomy":66,"score_weather":null,"transit_alt":42.9,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.83,"best_label":"good","best_window":"19:25\u201323:15","dark_hours":10.33,"date":"2027-02-13","moon_free_dark_hours":4.5,"moon_illumination":46,"moon_separation":46.5,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":42.9,"transit_local":"20:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":4.58,"best_label":"marginal","best_window":"19:30\u201300:05","dark_hours":10.3,"date":"2027-02-14","moon_free_dark_hours":3.27,"moon_illumination":57,"moon_separation":38.5,"score":null,"score_astronomy":35,"score_weather":null,"transit_alt":42.9,"transit_local":"20:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":4.25,"best_label":"marginal","best_window":"19:30\u201323:45","dark_hours":10.26,"date":"2027-02-15","moon_free_dark_hours":2.1,"moon_illumination":68,"moon_separation":33.7,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":42.9,"transit_local":"20:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.83,"best_label":"marginal","best_window":"19:30\u201323:20","dark_hours":10.22,"date":"2027-02-16","moon_free_dark_hours":1.07,"moon_illumination":78,"moon_separation":33.8,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":42.9,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.42,"best_label":"marginal","best_window":"19:30\u201322:55","dark_hours":10.18,"date":"2027-02-17","moon_free_dark_hours":0.18,"moon_illumination":87,"moon_separation":39.1,"score":null,"score_astronomy":13,"score_weather":null,"transit_alt":42.9,"transit_local":"20:10","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.33,"best_label":"marginal","best_window":"19:35\u201322:55","dark_hours":10.13,"date":"2027-02-18","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":48.1,"score":null,"score_astronomy":15,"score_weather":null,"transit_alt":42.9,"transit_local":"20:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.5,"best_label":"marginal","best_window":"19:35\u201323:05","dark_hours":10.09,"date":"2027-02-19","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":59.0,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":42.9,"transit_local":"20:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.75,"best_label":"marginal","best_window":"19:35\u201323:20","dark_hours":10.05,"date":"2027-02-20","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":70.8,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":42.9,"transit_local":"19:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.83,"best_label":"good","best_window":"19:35\u201321:25","dark_hours":10.01,"date":"2027-02-21","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":82.9,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":42.9,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":3.0,"best_label":"good","best_window":"19:40\u201322:40","dark_hours":9.97,"date":"2027-02-22","moon_free_dark_hours":0.58,"moon_illumination":95,"moon_separation":94.9,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":42.9,"transit_local":"19:50","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":3.08,"best_label":"good","best_window":"19:40\u201322:45","dark_hours":9.92,"date":"2027-02-23","moon_free_dark_hours":1.78,"moon_illumination":89,"moon_separation":106.5,"score":null,"score_astronomy":71,"score_weather":null,"transit_alt":42.9,"transit_local":"19:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":3.17,"best_label":"good","best_window":"19:40\u201322:50","dark_hours":9.88,"date":"2027-02-24","moon_free_dark_hours":2.97,"moon_illumination":81,"moon_separation":117.4,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":42.9,"transit_local":"19:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":3.25,"best_label":"good","best_window":"19:40\u201322:55","dark_hours":9.84,"date":"2027-02-25","moon_free_dark_hours":4.12,"moon_illumination":72,"moon_separation":127.3,"score":null,"score_astronomy":72,"score_weather":null,"transit_alt":42.9,"transit_local":"19:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":3.17,"best_label":"good","best_window":"19:40\u201322:50","dark_hours":9.79,"date":"2027-02-26","moon_free_dark_hours":5.23,"moon_illumination":62,"moon_separation":135.8,"score":null,"score_astronomy":70,"score_weather":null,"transit_alt":42.9,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.0,"best_label":"good","best_window":"19:45\u201322:45","dark_hours":9.75,"date":"2027-02-27","moon_free_dark_hours":6.28,"moon_illumination":53,"moon_separation":142.5,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":42.9,"transit_local":"19:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"19:45\u201322:45","dark_hours":9.7,"date":"2027-02-28","moon_free_dark_hours":7.22,"moon_illumination":43,"moon_separation":146.3,"score":null,"score_astronomy":67,"score_weather":null,"transit_alt":42.9,"transit_local":"19:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.92,"best_label":"good","best_window":"19:45\u201322:40","dark_hours":9.66,"date":"2027-03-01","moon_free_dark_hours":8.03,"moon_illumination":34,"moon_separation":146.6,"score":null,"score_astronomy":65,"score_weather":null,"transit_alt":42.9,"transit_local":"19:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"19:45\u201322:35","dark_hours":9.61,"date":"2027-03-02","moon_free_dark_hours":8.73,"moon_illumination":25,"moon_separation":143.3,"score":null,"score_astronomy":63,"score_weather":null,"transit_alt":42.9,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.67,"best_label":"good","best_window":"19:50\u201322:30","dark_hours":9.57,"date":"2027-03-03","moon_free_dark_hours":9.28,"moon_illumination":18,"moon_separation":137.3,"score":null,"score_astronomy":62,"score_weather":null,"transit_alt":42.9,"transit_local":"19:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"19:50\u201322:30","dark_hours":9.52,"date":"2027-03-04","moon_free_dark_hours":9.52,"moon_illumination":11,"moon_separation":129.5,"score":null,"score_astronomy":60,"score_weather":null,"transit_alt":42.9,"transit_local":"19:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.58,"best_label":"good","best_window":"19:50\u201322:25","dark_hours":9.47,"date":"2027-03-05","moon_free_dark_hours":9.47,"moon_illumination":6,"moon_separation":120.5,"score":null,"score_astronomy":58,"score_weather":null,"transit_alt":42.9,"transit_local":"19:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.5,"best_label":"good","best_window":"19:50\u201322:20","dark_hours":9.43,"date":"2027-03-06","moon_free_dark_hours":9.4,"moon_illumination":2,"moon_separation":110.9,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":42.9,"transit_local":"19:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.33,"best_label":"good","best_window":"19:55\u201322:15","dark_hours":9.38,"date":"2027-03-07","moon_free_dark_hours":9.37,"moon_illumination":0,"moon_separation":100.7,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":42.9,"transit_local":"18:55","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.25,"best_label":"good","best_window":"19:55\u201322:10","dark_hours":9.33,"date":"2027-03-08","moon_free_dark_hours":9.32,"moon_illumination":0,"moon_separation":90.2,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":42.9,"transit_local":"18:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"19:55\u201322:10","dark_hours":9.28,"date":"2027-03-09","moon_free_dark_hours":9.27,"moon_illumination":3,"moon_separation":79.5,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":42.9,"transit_local":"18:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.17,"best_label":"good","best_window":"19:55\u201322:05","dark_hours":9.23,"date":"2027-03-10","moon_free_dark_hours":8.42,"moon_illumination":7,"moon_separation":68.8,"score":null,"score_astronomy":48,"score_weather":null,"transit_alt":42.9,"transit_local":"18:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.0,"best_label":"good","best_window":"20:00\u201322:00","dark_hours":9.19,"date":"2027-03-11","moon_free_dark_hours":7.22,"moon_illumination":13,"moon_separation":58.3,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":42.9,"transit_local":"18:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":1.75,"best_label":"good","best_window":"20:00\u201321:45","dark_hours":9.14,"date":"2027-03-12","moon_free_dark_hours":5.98,"moon_illumination":21,"moon_separation":48.5,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":42.9,"transit_local":"18:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.58,"best_label":"good","best_window":"20:00\u201321:35","dark_hours":9.09,"date":"2027-03-13","moon_free_dark_hours":4.75,"moon_illumination":31,"moon_separation":40.1,"score":null,"score_astronomy":30,"score_weather":null,"transit_alt":42.9,"transit_local":"18:35","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":"2027-02-12","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"}}
