{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.78,"date":"2041-06-01","moon_free_dark_hours":4.18,"moon_illumination":9,"moon_separation":73.0,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":79.2,"transit_local":"10:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.75,"date":"2041-06-02","moon_free_dark_hours":3.43,"moon_illumination":16,"moon_separation":84.4,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":79.2,"transit_local":"10:10","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.71,"date":"2041-06-03","moon_free_dark_hours":2.83,"moon_illumination":23,"moon_separation":95.7,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":79.2,"transit_local":"10:05","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.68,"date":"2041-06-04","moon_free_dark_hours":2.33,"moon_illumination":32,"moon_separation":106.8,"score":null,"score_astronomy":1,"score_weather":null,"transit_alt":79.2,"transit_local":"10:00","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.08,"best_label":"marginal","best_window":"04:30\u201304:35","dark_hours":4.65,"date":"2041-06-05","moon_free_dark_hours":1.92,"moon_illumination":41,"moon_separation":117.8,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":79.2,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.08,"best_label":"marginal","best_window":"04:25\u201304:30","dark_hours":4.62,"date":"2041-06-06","moon_free_dark_hours":1.53,"moon_illumination":50,"moon_separation":128.6,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":79.2,"transit_local":"09:55","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:20\u201304:30","dark_hours":4.6,"date":"2041-06-07","moon_free_dark_hours":1.18,"moon_illumination":60,"moon_separation":139.0,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":79.2,"transit_local":"09:50","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.17,"best_label":"marginal","best_window":"04:20\u201304:30","dark_hours":4.57,"date":"2041-06-08","moon_free_dark_hours":0.87,"moon_illumination":69,"moon_separation":148.8,"score":null,"score_astronomy":2,"score_weather":null,"transit_alt":79.2,"transit_local":"09:45","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.25,"best_label":"marginal","best_window":"04:15\u201304:30","dark_hours":4.55,"date":"2041-06-09","moon_free_dark_hours":0.5,"moon_illumination":78,"moon_separation":156.6,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":79.2,"transit_local":"09:40","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.33,"best_label":"marginal","best_window":"04:10\u201304:30","dark_hours":4.53,"date":"2041-06-10","moon_free_dark_hours":0.13,"moon_illumination":86,"moon_separation":159.6,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":79.2,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.42,"best_label":"marginal","best_window":"04:05\u201304:30","dark_hours":4.51,"date":"2041-06-11","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":155.5,"score":null,"score_astronomy":3,"score_weather":null,"transit_alt":79.2,"transit_local":"09:35","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.33,"best_label":"marginal","best_window":"04:10\u201304:30","dark_hours":4.49,"date":"2041-06-12","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":146.3,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":79.2,"transit_local":"09:30","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.42,"best_label":"marginal","best_window":"04:05\u201304:30","dark_hours":4.47,"date":"2041-06-13","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":134.7,"score":null,"score_astronomy":4,"score_weather":null,"transit_alt":79.2,"transit_local":"09:25","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.42,"best_label":"marginal","best_window":"04:05\u201304:30","dark_hours":4.46,"date":"2041-06-14","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":122.0,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":79.2,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.42,"best_label":"marginal","best_window":"04:05\u201304:30","dark_hours":4.45,"date":"2041-06-15","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":108.8,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":79.2,"transit_local":"09:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.42,"best_label":"marginal","best_window":"03:15\u201303:40","dark_hours":4.44,"date":"2041-06-16","moon_free_dark_hours":0.38,"moon_illumination":92,"moon_separation":95.2,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":79.2,"transit_local":"09:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.42,"best_label":"marginal","best_window":"03:15\u201303:40","dark_hours":4.43,"date":"2041-06-17","moon_free_dark_hours":1.07,"moon_illumination":84,"moon_separation":81.5,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":79.2,"transit_local":"09:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"marginal","best_window":"03:10\u201303:40","dark_hours":4.43,"date":"2041-06-18","moon_free_dark_hours":1.63,"moon_illumination":74,"moon_separation":68.0,"score":null,"score_astronomy":5,"score_weather":null,"transit_alt":79.2,"transit_local":"09:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.58,"best_label":"marginal","best_window":"03:05\u201303:40","dark_hours":4.42,"date":"2041-06-19","moon_free_dark_hours":2.1,"moon_illumination":64,"moon_separation":54.8,"score":null,"score_astronomy":6,"score_weather":null,"transit_alt":79.2,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.67,"best_label":"marginal","best_window":"03:00\u201303:40","dark_hours":4.42,"date":"2041-06-20","moon_free_dark_hours":2.5,"moon_illumination":52,"moon_separation":42.3,"score":null,"score_astronomy":7,"score_weather":null,"transit_alt":79.2,"transit_local":"09:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.67,"best_label":"marginal","best_window":"03:00\u201303:40","dark_hours":4.42,"date":"2041-06-21","moon_free_dark_hours":2.88,"moon_illumination":41,"moon_separation":31.0,"score":null,"score_astronomy":8,"score_weather":null,"transit_alt":79.2,"transit_local":"08:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.08,"best_label":"good","best_window":"03:35\u201303:40","dark_hours":4.43,"date":"2041-06-22","moon_free_dark_hours":3.28,"moon_illumination":30,"moon_separation":22.6,"score":null,"score_astronomy":11,"score_weather":null,"transit_alt":79.2,"transit_local":"08:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.25,"best_label":"good","best_window":"03:25\u201303:40","dark_hours":4.43,"date":"2041-06-23","moon_free_dark_hours":3.7,"moon_illumination":21,"moon_separation":20.6,"score":null,"score_astronomy":14,"score_weather":null,"transit_alt":79.2,"transit_local":"08:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.42,"best_label":"good","best_window":"03:15\u201303:40","dark_hours":4.44,"date":"2041-06-24","moon_free_dark_hours":4.18,"moon_illumination":13,"moon_separation":26.1,"score":null,"score_astronomy":17,"score_weather":null,"transit_alt":79.2,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.5,"best_label":"good","best_window":"03:10\u201303:40","dark_hours":4.45,"date":"2041-06-25","moon_free_dark_hours":4.43,"moon_illumination":7,"moon_separation":35.6,"score":null,"score_astronomy":21,"score_weather":null,"transit_alt":79.2,"transit_local":"08:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.58,"best_label":"good","best_window":"03:05\u201303:40","dark_hours":4.46,"date":"2041-06-26","moon_free_dark_hours":4.43,"moon_illumination":2,"moon_separation":46.5,"score":null,"score_astronomy":22,"score_weather":null,"transit_alt":79.2,"transit_local":"08:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.58,"best_label":"good","best_window":"03:05\u201303:40","dark_hours":4.47,"date":"2041-06-27","moon_free_dark_hours":4.45,"moon_illumination":0,"moon_separation":57.9,"score":null,"score_astronomy":23,"score_weather":null,"transit_alt":79.2,"transit_local":"08:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.67,"best_label":"good","best_window":"03:00\u201303:40","dark_hours":4.49,"date":"2041-06-28","moon_free_dark_hours":4.48,"moon_illumination":0,"moon_separation":69.4,"score":null,"score_astronomy":25,"score_weather":null,"transit_alt":79.2,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.75,"best_label":"good","best_window":"02:55\u201303:40","dark_hours":4.5,"date":"2041-06-29","moon_free_dark_hours":4.48,"moon_illumination":2,"moon_separation":80.9,"score":null,"score_astronomy":26,"score_weather":null,"transit_alt":79.2,"transit_local":"08:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.92,"best_label":"good","best_window":"02:50\u201303:45","dark_hours":4.52,"date":"2041-06-30","moon_free_dark_hours":4.5,"moon_illumination":6,"moon_separation":92.2,"score":null,"score_astronomy":29,"score_weather":null,"transit_alt":79.2,"transit_local":"08:20","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2041-06-01","target":{"common_name":"Triangulum Pinwheel","dec":30.66017511,"morphology":"SA(s)cd","name":"M 33","ra":23.46206906,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M33","source":"sesame","type":"GiG","type_text":"galaxy in a group","vmag":5.72}}