{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.79,"date":"2026-06-01","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":124.2,"score":1,"score_astronomy":1,"score_weather":74,"transit_alt":79.1,"transit_local":"10:15","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.76,"date":"2026-06-02","moon_free_dark_hours":0.27,"moon_illumination":94,"moon_separation":112.9,"score":1,"score_astronomy":1,"score_weather":79,"transit_alt":79.1,"transit_local":"10:10","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.73,"date":"2026-06-03","moon_free_dark_hours":0.9,"moon_illumination":89,"moon_separation":101.4,"score":0,"score_astronomy":1,"score_weather":46,"transit_alt":79.1,"transit_local":"10:05","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.69,"date":"2026-06-04","moon_free_dark_hours":1.42,"moon_illumination":82,"moon_separation":89.8,"score":0,"score_astronomy":1,"score_weather":37,"transit_alt":79.1,"transit_local":"10:00","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.66,"date":"2026-06-05","moon_free_dark_hours":1.85,"moon_illumination":74,"moon_separation":78.1,"score":1,"score_astronomy":1,"score_weather":93,"transit_alt":79.1,"transit_local":"10:00","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.63,"date":"2026-06-06","moon_free_dark_hours":2.22,"moon_illumination":65,"moon_separation":66.2,"score":1,"score_astronomy":1,"score_weather":98,"transit_alt":79.1,"transit_local":"09:55","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.61,"date":"2026-06-07","moon_free_dark_hours":2.55,"moon_illumination":55,"moon_separation":54.1,"score":1,"score_astronomy":1,"score_weather":99,"transit_alt":79.1,"transit_local":"09:50","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.58,"date":"2026-06-08","moon_free_dark_hours":2.88,"moon_illumination":45,"moon_separation":41.9,"score":0,"score_astronomy":1,"score_weather":3,"transit_alt":79.1,"transit_local":"09:45","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.56,"date":"2026-06-09","moon_free_dark_hours":3.22,"moon_illumination":34,"moon_separation":29.9,"score":2,"score_astronomy":2,"score_weather":99,"transit_alt":79.1,"transit_local":"09:40","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":0.08,"best_label":"marginal","best_window":"04:25\u201304:30","dark_hours":4.53,"date":"2026-06-10","moon_free_dark_hours":3.6,"moon_illumination":24,"moon_separation":19.3,"score":2,"score_astronomy":2,"score_weather":100,"transit_alt":79.1,"transit_local":"09:40","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.51,"date":"2026-06-11","moon_free_dark_hours":4.07,"moon_illumination":15,"moon_separation":15.1,"score":0,"score_astronomy":3,"score_weather":0,"transit_alt":79.1,"transit_local":"09:35","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.49,"date":"2026-06-12","moon_free_dark_hours":4.47,"moon_illumination":7,"moon_separation":22.4,"score":0,"score_astronomy":4,"score_weather":0,"transit_alt":79.1,"transit_local":"09:30","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.5,"best_label":"marginal","best_window":"04:00\u201304:30","dark_hours":4.48,"date":"2026-06-13","moon_free_dark_hours":4.47,"moon_illumination":2,"moon_separation":34.9,"score":5,"score_astronomy":5,"score_weather":97,"transit_alt":79.1,"transit_local":"09:25","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.58,"best_label":"marginal","best_window":"03:55\u201304:30","dark_hours":4.46,"date":"2026-06-14","moon_free_dark_hours":4.45,"moon_illumination":0,"moon_separation":48.9,"score":6,"score_astronomy":6,"score_weather":99,"transit_alt":79.1,"transit_local":"09:20","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.33,"best_label":"marginal","best_window":"03:20\u201303:40","dark_hours":4.45,"date":"2026-06-15","moon_free_dark_hours":4.43,"moon_illumination":1,"moon_separation":63.3,"score":3,"score_astronomy":7,"score_weather":45,"transit_alt":79.1,"transit_local":"09:20","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":4.44,"date":"2026-06-16","moon_free_dark_hours":4.43,"moon_illumination":5,"moon_separation":77.8,"score":0,"score_astronomy":7,"score_weather":0,"transit_alt":79.1,"transit_local":"09:15","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.58,"best_label":"marginal","best_window":"03:55\u201304:30","dark_hours":4.43,"date":"2026-06-17","moon_free_dark_hours":4.18,"moon_illumination":12,"moon_separation":92.1,"score":8,"score_astronomy":8,"score_weather":94,"transit_alt":79.1,"transit_local":"09:10","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.5,"best_label":"marginal","best_window":"03:10\u201303:40","dark_hours":4.43,"date":"2026-06-18","moon_free_dark_hours":3.65,"moon_illumination":20,"moon_separation":106.0,"score":5,"score_astronomy":10,"score_weather":48,"transit_alt":79.1,"transit_local":"09:05","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.08,"best_label":"good","best_window":"03:35\u201303:40","dark_hours":4.42,"date":"2026-06-19","moon_free_dark_hours":3.22,"moon_illumination":30,"moon_separation":119.3,"score":11,"score_astronomy":11,"score_weather":99,"transit_alt":79.1,"transit_local":"09:05","verdict":"poor","weather_source":"history","weekday":"Fri"},{"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"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2026-06-01","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}}