{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.08,"best_label":"marginal","best_window":"22:55\u201301:00","dark_hours":4.9,"date":"2025-05-29","moon_free_dark_hours":4.0,"moon_illumination":11,"moon_separation":78.3,"score":23,"score_astronomy":56,"score_weather":41,"transit_alt":50.2,"transit_local":"21:20","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.86,"date":"2025-05-30","moon_free_dark_hours":3.25,"moon_illumination":19,"moon_separation":64.5,"score":0,"score_astronomy":51,"score_weather":0,"transit_alt":50.2,"transit_local":"21:15","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":1.25,"best_label":"good","best_window":"22:55\u201300:10","dark_hours":4.82,"date":"2025-05-31","moon_free_dark_hours":2.68,"moon_illumination":28,"moon_separation":51.2,"score":38,"score_astronomy":44,"score_weather":86,"transit_alt":50.2,"transit_local":"21:15","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":2.58,"best_label":"marginal","best_window":"22:10\u201300:45","dark_hours":4.79,"date":"2025-06-01","moon_free_dark_hours":2.23,"moon_illumination":38,"moon_separation":38.4,"score":22,"score_astronomy":34,"score_weather":65,"transit_alt":50.2,"transit_local":"21:10","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.5,"best_label":"good","best_window":"00:00\u201300:30","dark_hours":4.75,"date":"2025-06-02","moon_free_dark_hours":1.85,"moon_illumination":48,"moon_separation":26.0,"score":24,"score_astronomy":26,"score_weather":94,"transit_alt":50.2,"transit_local":"21:05","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":2.33,"best_label":"marginal","best_window":"23:00\u201301:20","dark_hours":4.72,"date":"2025-06-03","moon_free_dark_hours":1.52,"moon_illumination":58,"moon_separation":14.3,"score":21,"score_astronomy":21,"score_weather":100,"transit_alt":50.2,"transit_local":"21:00","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":2.17,"best_label":"marginal","best_window":"23:00\u201301:10","dark_hours":4.69,"date":"2025-06-04","moon_free_dark_hours":1.2,"moon_illumination":67,"moon_separation":5.9,"score":17,"score_astronomy":17,"score_weather":100,"transit_alt":50.2,"transit_local":"21:00","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.65,"date":"2025-06-05","moon_free_dark_hours":0.88,"moon_illumination":76,"moon_separation":12.3,"score":0,"score_astronomy":13,"score_weather":0,"transit_alt":50.2,"transit_local":"20:55","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":1.75,"best_label":"marginal","best_window":"23:05\u201300:50","dark_hours":4.63,"date":"2025-06-06","moon_free_dark_hours":0.53,"moon_illumination":83,"moon_separation":23.4,"score":11,"score_astronomy":11,"score_weather":99,"transit_alt":50.2,"transit_local":"20:50","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":1.58,"best_label":"marginal","best_window":"23:05\u201300:40","dark_hours":4.6,"date":"2025-06-07","moon_free_dark_hours":0.15,"moon_illumination":90,"moon_separation":34.9,"score":10,"score_astronomy":10,"score_weather":100,"transit_alt":50.2,"transit_local":"20:45","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":1.58,"best_label":"marginal","best_window":"23:05\u201300:40","dark_hours":4.57,"date":"2025-06-08","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":46.7,"score":12,"score_astronomy":12,"score_weather":97,"transit_alt":50.2,"transit_local":"20:40","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":1.58,"best_label":"marginal","best_window":"23:05\u201300:40","dark_hours":4.55,"date":"2025-06-09","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":58.5,"score":12,"score_astronomy":14,"score_weather":85,"transit_alt":50.2,"transit_local":"20:40","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.75,"best_label":"marginal","best_window":"00:00\u201300:45","dark_hours":4.53,"date":"2025-06-10","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":70.5,"score":5,"score_astronomy":17,"score_weather":29,"transit_alt":50.2,"transit_local":"20:35","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.58,"best_label":"good","best_window":"23:10\u201323:45","dark_hours":4.51,"date":"2025-06-11","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":82.7,"score":20,"score_astronomy":20,"score_weather":100,"transit_alt":50.2,"transit_local":"20:30","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.83,"best_label":"good","best_window":"23:10\u201300:00","dark_hours":4.49,"date":"2025-06-12","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":95.1,"score":23,"score_astronomy":23,"score_weather":98,"transit_alt":50.2,"transit_local":"20:25","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.75,"best_label":"marginal","best_window":"00:00\u201300:45","dark_hours":4.47,"date":"2025-06-13","moon_free_dark_hours":0.2,"moon_illumination":93,"moon_separation":107.6,"score":10,"score_astronomy":30,"score_weather":35,"transit_alt":50.2,"transit_local":"20:20","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.46,"date":"2025-06-14","moon_free_dark_hours":0.78,"moon_illumination":87,"moon_separation":120.4,"score":5,"score_astronomy":30,"score_weather":15,"transit_alt":50.2,"transit_local":"20:20","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":1.42,"best_label":"marginal","best_window":"23:10\u201300:35","dark_hours":4.45,"date":"2025-06-15","moon_free_dark_hours":1.25,"moon_illumination":79,"moon_separation":133.3,"score":21,"score_astronomy":29,"score_weather":72,"transit_alt":50.2,"transit_local":"20:15","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.75,"best_label":"good","best_window":"23:10\u201323:55","dark_hours":4.44,"date":"2025-06-16","moon_free_dark_hours":1.67,"moon_illumination":70,"moon_separation":146.4,"score":26,"score_astronomy":28,"score_weather":94,"transit_alt":50.2,"transit_local":"20:10","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.83,"best_label":"good","best_window":"23:10\u201300:00","dark_hours":4.43,"date":"2025-06-17","moon_free_dark_hours":2.02,"moon_illumination":60,"moon_separation":159.5,"score":24,"score_astronomy":26,"score_weather":92,"transit_alt":50.2,"transit_local":"20:05","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.75,"best_label":"good","best_window":"23:10\u201323:55","dark_hours":4.43,"date":"2025-06-18","moon_free_dark_hours":2.38,"moon_illumination":49,"moon_separation":171.7,"score":23,"score_astronomy":25,"score_weather":91,"transit_alt":50.2,"transit_local":"20:05","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.5,"best_label":"good","best_window":"23:10\u201323:40","dark_hours":4.42,"date":"2025-06-19","moon_free_dark_hours":2.75,"moon_illumination":37,"moon_separation":169.9,"score":22,"score_astronomy":24,"score_weather":90,"transit_alt":50.2,"transit_local":"20:00","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.25,"best_label":"good","best_window":"23:15\u201323:30","dark_hours":4.42,"date":"2025-06-20","moon_free_dark_hours":3.15,"moon_illumination":26,"moon_separation":156.7,"score":18,"score_astronomy":22,"score_weather":83,"transit_alt":50.2,"transit_local":"19:55","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.67,"best_label":"marginal","best_window":"23:15\u201323:55","dark_hours":4.42,"date":"2025-06-21","moon_free_dark_hours":3.65,"moon_illumination":17,"moon_separation":142.5,"score":12,"score_astronomy":20,"score_weather":59,"transit_alt":50.2,"transit_local":"19:50","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.42,"best_label":"good","best_window":"23:15\u201323:40","dark_hours":4.42,"date":"2025-06-22","moon_free_dark_hours":4.27,"moon_illumination":9,"moon_separation":127.9,"score":18,"score_astronomy":18,"score_weather":100,"transit_alt":50.2,"transit_local":"19:45","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.33,"best_label":"good","best_window":"23:15\u201323:35","dark_hours":4.43,"date":"2025-06-23","moon_free_dark_hours":4.42,"moon_illumination":3,"moon_separation":113.3,"score":17,"score_astronomy":17,"score_weather":100,"transit_alt":50.2,"transit_local":"19:45","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.25,"best_label":"good","best_window":"23:15\u201323:30","dark_hours":4.44,"date":"2025-06-24","moon_free_dark_hours":4.42,"moon_illumination":1,"moon_separation":98.7,"score":15,"score_astronomy":15,"score_weather":100,"transit_alt":50.2,"transit_local":"19:40","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.17,"best_label":"good","best_window":"23:15\u201323:25","dark_hours":4.45,"date":"2025-06-25","moon_free_dark_hours":4.43,"moon_illumination":0,"moon_separation":84.2,"score":14,"score_astronomy":14,"score_weather":99,"transit_alt":50.2,"transit_local":"19:35","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.17,"best_label":"good","best_window":"23:15\u201323:25","dark_hours":4.46,"date":"2025-06-26","moon_free_dark_hours":4.43,"moon_illumination":3,"moon_separation":70.1,"score":12,"score_astronomy":12,"score_weather":99,"transit_alt":50.2,"transit_local":"19:30","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.83,"best_label":"marginal","best_window":"23:00\u201323:50","dark_hours":4.47,"date":"2025-06-27","moon_free_dark_hours":4.45,"moon_illumination":8,"moon_separation":56.4,"score":8,"score_astronomy":11,"score_weather":70,"transit_alt":50.2,"transit_local":"19:25","verdict":"poor","weather_source":"history","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":"2025-05-29","target":{"dec":2.05238823,"morphology":"E3","name":"3C 273","ra":187.27791594,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=3C%20273","source":"sesame","type":"BLL","type_text":"BL Lac object \u2014 a blazar","vmag":14.83}}
