{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.9,"date":"2025-09-25","moon_free_dark_hours":8.88,"moon_illumination":15,"moon_separation":159.0,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"02:35","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":1.0,"best_label":"good","best_window":"00:00\u201301:00","dark_hours":8.95,"date":"2025-09-26","moon_free_dark_hours":8.77,"moon_illumination":22,"moon_separation":150.0,"score":20,"score_astronomy":100,"score_weather":20,"transit_alt":79.1,"transit_local":"02:30","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":1.0,"best_label":"marginal","best_window":"22:00\u201323:00","dark_hours":9.0,"date":"2025-09-27","moon_free_dark_hours":8.18,"moon_illumination":31,"moon_separation":139.6,"score":9,"score_astronomy":100,"score_weather":9,"transit_alt":79.1,"transit_local":"02:30","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.05,"date":"2025-09-28","moon_free_dark_hours":7.48,"moon_illumination":40,"moon_separation":128.5,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"02:25","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.17,"best_label":"marginal","best_window":"05:00\u201305:10","dark_hours":9.09,"date":"2025-09-29","moon_free_dark_hours":6.62,"moon_illumination":49,"moon_separation":117.1,"score":4,"score_astronomy":100,"score_weather":4,"transit_alt":79.1,"transit_local":"02:20","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":5.83,"best_label":"good","best_window":"00:00\u201305:50","dark_hours":9.14,"date":"2025-09-30","moon_free_dark_hours":5.6,"moon_illumination":59,"moon_separation":105.3,"score":64,"score_astronomy":100,"score_weather":64,"transit_alt":79.1,"transit_local":"02:15","verdict":"marginal","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.19,"date":"2025-10-01","moon_free_dark_hours":4.48,"moon_illumination":69,"moon_separation":93.2,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"02:15","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.24,"date":"2025-10-02","moon_free_dark_hours":3.3,"moon_illumination":78,"moon_separation":80.6,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"02:10","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.29,"date":"2025-10-03","moon_free_dark_hours":2.1,"moon_illumination":86,"moon_separation":67.7,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"02:05","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":3.08,"best_label":"good","best_window":"02:45\u201305:50","dark_hours":9.33,"date":"2025-10-04","moon_free_dark_hours":0.87,"moon_illumination":93,"moon_separation":54.4,"score":92,"score_astronomy":95,"score_weather":97,"transit_alt":79.1,"transit_local":"02:00","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":1.42,"best_label":"marginal","best_window":"20:35\u201322:00","dark_hours":9.38,"date":"2025-10-05","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":41.0,"score":20,"score_astronomy":55,"score_weather":36,"transit_alt":79.1,"transit_local":"01:55","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.43,"date":"2025-10-06","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":28.2,"score":0,"score_astronomy":34,"score_weather":0,"transit_alt":79.1,"transit_local":"01:55","verdict":"unusable","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.47,"date":"2025-10-07","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":17.9,"score":0,"score_astronomy":29,"score_weather":0,"transit_alt":79.1,"transit_local":"01:50","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.52,"date":"2025-10-08","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":16.9,"score":0,"score_astronomy":34,"score_weather":0,"transit_alt":79.1,"transit_local":"01:45","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":6.92,"best_label":"marginal","best_window":"20:25\u201303:20","dark_hours":9.57,"date":"2025-10-09","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":26.2,"score":43,"score_astronomy":46,"score_weather":94,"transit_alt":79.1,"transit_local":"01:40","verdict":"marginal","weather_source":"history","weekday":"Thu"},{"best_hours":0.42,"best_label":"good","best_window":"20:20\u201320:45","dark_hours":9.61,"date":"2025-10-10","moon_free_dark_hours":0.38,"moon_illumination":80,"moon_separation":38.9,"score":52,"score_astronomy":81,"score_weather":65,"transit_alt":79.1,"transit_local":"01:35","verdict":"marginal","weather_source":"history","weekday":"Fri"},{"best_hours":1.33,"best_label":"good","best_window":"20:20\u201321:40","dark_hours":9.66,"date":"2025-10-11","moon_free_dark_hours":1.32,"moon_illumination":70,"moon_separation":52.2,"score":26,"score_astronomy":88,"score_weather":29,"transit_alt":79.1,"transit_local":"01:35","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":2.0,"best_label":"good","best_window":"01:00\u201303:00","dark_hours":9.7,"date":"2025-10-12","moon_free_dark_hours":2.43,"moon_illumination":59,"moon_separation":65.6,"score":39,"score_astronomy":96,"score_weather":41,"transit_alt":79.1,"transit_local":"01:30","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.74,"date":"2025-10-13","moon_free_dark_hours":3.63,"moon_illumination":48,"moon_separation":78.8,"score":6,"score_astronomy":100,"score_weather":6,"transit_alt":79.1,"transit_local":"01:25","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.79,"date":"2025-10-14","moon_free_dark_hours":4.87,"moon_illumination":38,"moon_separation":91.7,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"01:20","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":1.0,"best_label":"good","best_window":"23:00\u201300:00","dark_hours":9.83,"date":"2025-10-15","moon_free_dark_hours":6.08,"moon_illumination":28,"moon_separation":104.3,"score":15,"score_astronomy":100,"score_weather":15,"transit_alt":79.1,"transit_local":"01:20","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.87,"date":"2025-10-16","moon_free_dark_hours":7.23,"moon_illumination":19,"moon_separation":116.6,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"01:15","verdict":"unusable","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.92,"date":"2025-10-17","moon_free_dark_hours":8.35,"moon_illumination":12,"moon_separation":128.5,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"01:10","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":9.96,"date":"2025-10-18","moon_free_dark_hours":9.42,"moon_illumination":6,"moon_separation":139.9,"score":1,"score_astronomy":100,"score_weather":1,"transit_alt":79.1,"transit_local":"01:05","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":10.0,"date":"2025-10-19","moon_free_dark_hours":9.98,"moon_illumination":2,"moon_separation":150.7,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":79.1,"transit_local":"01:00","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.92,"best_label":"good","best_window":"20:05\u201321:00","dark_hours":10.04,"date":"2025-10-20","moon_free_dark_hours":10.03,"moon_illumination":0,"moon_separation":159.7,"score":16,"score_astronomy":100,"score_weather":16,"transit_alt":79.1,"transit_local":"01:00","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":1.0,"best_label":"marginal","best_window":"23:00\u201300:00","dark_hours":10.08,"date":"2025-10-21","moon_free_dark_hours":10.07,"moon_illumination":0,"moon_separation":164.3,"score":10,"score_astronomy":100,"score_weather":10,"transit_alt":79.1,"transit_local":"00:55","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":1.67,"best_label":"good","best_window":"22:20\u201300:00","dark_hours":10.13,"date":"2025-10-22","moon_free_dark_hours":10.12,"moon_illumination":2,"moon_separation":161.0,"score":29,"score_astronomy":100,"score_weather":29,"transit_alt":79.1,"transit_local":"00:50","verdict":"poor","weather_source":"history","weekday":"Wed"},{"best_hours":0.92,"best_label":"good","best_window":"20:05\u201321:00","dark_hours":10.17,"date":"2025-10-23","moon_free_dark_hours":10.15,"moon_illumination":5,"moon_separation":152.7,"score":16,"score_astronomy":100,"score_weather":16,"transit_alt":79.1,"transit_local":"00:45","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":5.0,"best_label":"good","best_window":"01:00\u201306:00","dark_hours":10.21,"date":"2025-10-24","moon_free_dark_hours":10.18,"moon_illumination":10,"moon_separation":142.6,"score":69,"score_astronomy":100,"score_weather":69,"transit_alt":79.1,"transit_local":"00:40","verdict":"marginal","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":"2025-09-25","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}}