{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.17,"best_label":"good","best_window":"03:30\u201303:40","dark_hours":4.42,"date":"2026-06-20","moon_free_dark_hours":2.85,"moon_illumination":40,"moon_separation":132.1,"score":12,"score_astronomy":12,"score_weather":100,"transit_alt":79.1,"transit_local":"09:00","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.25,"best_label":"good","best_window":"03:25\u201303:40","dark_hours":4.42,"date":"2026-06-21","moon_free_dark_hours":2.5,"moon_illumination":50,"moon_separation":144.0,"score":13,"score_astronomy":13,"score_weather":100,"transit_alt":79.1,"transit_local":"08:55","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.75,"best_label":"marginal","best_window":"02:55\u201303:40","dark_hours":4.42,"date":"2026-06-22","moon_free_dark_hours":2.17,"moon_illumination":60,"moon_separation":154.9,"score":11,"score_astronomy":15,"score_weather":75,"transit_alt":79.1,"transit_local":"08:50","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.83,"best_label":"marginal","best_window":"02:50\u201303:40","dark_hours":4.43,"date":"2026-06-23","moon_free_dark_hours":1.83,"moon_illumination":70,"moon_separation":163.1,"score":12,"score_astronomy":17,"score_weather":70,"transit_alt":79.1,"transit_local":"08:45","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.33,"best_label":"good","best_window":"03:20\u201303:40","dark_hours":4.43,"date":"2026-06-24","moon_free_dark_hours":1.43,"moon_illumination":78,"moon_separation":164.6,"score":17,"score_astronomy":18,"score_weather":96,"transit_alt":79.1,"transit_local":"08:45","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.25,"best_label":"good","best_window":"03:25\u201303:40","dark_hours":4.44,"date":"2026-06-25","moon_free_dark_hours":0.98,"moon_illumination":86,"moon_separation":158.3,"score":18,"score_astronomy":20,"score_weather":90,"transit_alt":79.1,"transit_local":"08:40","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.42,"best_label":"good","best_window":"03:15\u201303:40","dark_hours":4.45,"date":"2026-06-26","moon_free_dark_hours":0.43,"moon_illumination":92,"moon_separation":148.7,"score":21,"score_astronomy":21,"score_weather":99,"transit_alt":79.1,"transit_local":"08:35","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.42,"best_label":"marginal","best_window":"02:35\u201303:00","dark_hours":4.47,"date":"2026-06-27","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":138.0,"score":3,"score_astronomy":20,"score_weather":14,"transit_alt":79.1,"transit_local":"08:30","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.5,"best_label":"good","best_window":"03:10\u201303:40","dark_hours":4.48,"date":"2026-06-28","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":127.0,"score":21,"score_astronomy":21,"score_weather":100,"transit_alt":79.1,"transit_local":"08:25","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.42,"best_label":"good","best_window":"03:15\u201303:40","dark_hours":4.5,"date":"2026-06-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":115.6,"score":19,"score_astronomy":20,"score_weather":94,"transit_alt":79.1,"transit_local":"08:25","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.42,"best_label":"good","best_window":"03:20\u201303:45","dark_hours":4.52,"date":"2026-06-30","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":104.2,"score":18,"score_astronomy":19,"score_weather":94,"transit_alt":79.1,"transit_local":"08:20","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.75,"best_label":"marginal","best_window":"03:00\u201303:45","dark_hours":4.54,"date":"2026-07-01","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":92.6,"score":7,"score_astronomy":17,"score_weather":40,"transit_alt":79.1,"transit_local":"08:15","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":1.25,"best_label":"marginal","best_window":"02:30\u201303:45","dark_hours":4.56,"date":"2026-07-02","moon_free_dark_hours":0.0,"moon_illumination":92,"moon_separation":80.8,"score":12,"score_astronomy":15,"score_weather":79,"transit_alt":79.1,"transit_local":"08:10","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.08,"best_label":"marginal","best_window":"02:55\u201303:00","dark_hours":4.58,"date":"2026-07-03","moon_free_dark_hours":0.17,"moon_illumination":86,"moon_separation":68.9,"score":8,"score_astronomy":14,"score_weather":54,"transit_alt":79.1,"transit_local":"08:05","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":1.17,"best_label":"marginal","best_window":"02:35\u201303:45","dark_hours":4.61,"date":"2026-07-04","moon_free_dark_hours":0.53,"moon_illumination":78,"moon_separation":56.9,"score":12,"score_astronomy":13,"score_weather":91,"transit_alt":79.1,"transit_local":"08:05","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":1.42,"best_label":"marginal","best_window":"02:20\u201303:45","dark_hours":4.64,"date":"2026-07-05","moon_free_dark_hours":0.88,"moon_illumination":70,"moon_separation":44.9,"score":13,"score_astronomy":14,"score_weather":90,"transit_alt":79.1,"transit_local":"08:00","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":1.75,"best_label":"marginal","best_window":"02:05\u201303:50","dark_hours":4.67,"date":"2026-07-06","moon_free_dark_hours":1.23,"moon_illumination":59,"moon_separation":33.0,"score":16,"score_astronomy":16,"score_weather":98,"transit_alt":79.1,"transit_local":"07:55","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":2.75,"best_label":"marginal","best_window":"01:55\u201304:40","dark_hours":4.7,"date":"2026-07-07","moon_free_dark_hours":1.62,"moon_illumination":49,"moon_separation":22.0,"score":20,"score_astronomy":20,"score_weather":99,"transit_alt":79.1,"transit_local":"07:50","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.73,"date":"2026-07-08","moon_free_dark_hours":2.07,"moon_illumination":38,"moon_separation":15.0,"score":0,"score_astronomy":26,"score_weather":0,"transit_alt":79.1,"transit_local":"07:50","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":1.25,"best_label":"good","best_window":"02:35\u201303:50","dark_hours":4.76,"date":"2026-07-09","moon_free_dark_hours":2.6,"moon_illumination":27,"moon_separation":18.6,"score":28,"score_astronomy":31,"score_weather":91,"transit_alt":79.1,"transit_local":"07:45","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":1.67,"best_label":"good","best_window":"02:15\u201303:55","dark_hours":4.8,"date":"2026-07-10","moon_free_dark_hours":3.3,"moon_illumination":17,"moon_separation":29.6,"score":39,"score_astronomy":39,"score_weather":100,"transit_alt":79.1,"transit_local":"07:40","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"02:10\u201303:55","dark_hours":4.84,"date":"2026-07-11","moon_free_dark_hours":4.18,"moon_illumination":9,"moon_separation":42.9,"score":46,"score_astronomy":46,"score_weather":100,"transit_alt":79.1,"transit_local":"07:35","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":1.75,"best_label":"good","best_window":"02:10\u201303:55","dark_hours":4.87,"date":"2026-07-12","moon_free_dark_hours":4.87,"moon_illumination":3,"moon_separation":57.0,"score":48,"score_astronomy":50,"score_weather":95,"transit_alt":79.1,"transit_local":"07:30","verdict":"marginal","weather_source":"history","weekday":"Sun"},{"best_hours":1.75,"best_label":"good","best_window":"02:10\u201303:55","dark_hours":4.91,"date":"2026-07-13","moon_free_dark_hours":4.9,"moon_illumination":0,"moon_separation":71.5,"score":47,"score_astronomy":52,"score_weather":89,"transit_alt":79.1,"transit_local":"07:30","verdict":"marginal","weather_source":"history","weekday":"Mon"},{"best_hours":2.08,"best_label":"good","best_window":"01:55\u201304:00","dark_hours":4.96,"date":"2026-07-14","moon_free_dark_hours":4.93,"moon_illumination":0,"moon_separation":86.0,"score":53,"score_astronomy":54,"score_weather":99,"transit_alt":79.1,"transit_local":"07:25","verdict":"marginal","weather_source":"history","weekday":"Tue"},{"best_hours":1.92,"best_label":"good","best_window":"02:05\u201304:00","dark_hours":5.0,"date":"2026-07-15","moon_free_dark_hours":4.98,"moon_illumination":3,"moon_separation":100.3,"score":47,"score_astronomy":57,"score_weather":82,"transit_alt":79.1,"transit_local":"07:20","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":0.83,"best_label":"marginal","best_window":"04:00\u201304:50","dark_hours":5.04,"date":"2026-07-16","moon_free_dark_hours":5.02,"moon_illumination":9,"moon_separation":114.2,"score":11,"score_astronomy":59,"score_weather":18,"transit_alt":79.1,"transit_local":"07:15","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":2.17,"best_label":"good","best_window":"01:50\u201304:00","dark_hours":5.08,"date":"2026-07-17","moon_free_dark_hours":5.07,"moon_illumination":16,"moon_separation":127.5,"score":60,"score_astronomy":61,"score_weather":98,"transit_alt":79.1,"transit_local":"07:10","verdict":"marginal","weather_source":"history","weekday":"Fri"},{"best_hours":2.42,"best_label":"good","best_window":"01:40\u201304:05","dark_hours":5.13,"date":"2026-07-18","moon_free_dark_hours":4.9,"moon_illumination":25,"moon_separation":140.2,"score":58,"score_astronomy":64,"score_weather":90,"transit_alt":79.1,"transit_local":"07:10","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":2.42,"best_label":"good","best_window":"01:40\u201304:05","dark_hours":5.18,"date":"2026-07-19","moon_free_dark_hours":4.57,"moon_illumination":35,"moon_separation":151.8,"score":65,"score_astronomy":66,"score_weather":99,"transit_alt":79.1,"transit_local":"07:05","verdict":"marginal","weather_source":"history","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":"2026-06-20","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}}