{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":1.0,"best_label":"good","best_window":"03:00\u201304:00","dark_hours":5.37,"date":"2026-07-23","moon_free_dark_hours":2.97,"moon_illumination":73,"moon_separation":151.5,"score":41,"score_astronomy":75,"score_weather":55,"transit_alt":79.1,"transit_local":"06:50","verdict":"marginal","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.42,"date":"2026-07-24","moon_free_dark_hours":2.37,"moon_illumination":81,"moon_separation":141.0,"score":0,"score_astronomy":79,"score_weather":0,"transit_alt":79.1,"transit_local":"06:45","verdict":"unusable","weather_source":"history","weekday":"Fri"},{"best_hours":2.67,"best_label":"good","best_window":"01:35\u201304:15","dark_hours":5.47,"date":"2026-07-25","moon_free_dark_hours":1.62,"moon_illumination":88,"moon_separation":130.0,"score":71,"score_astronomy":79,"score_weather":89,"transit_alt":79.1,"transit_local":"06:40","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":2.92,"best_label":"good","best_window":"01:20\u201304:15","dark_hours":5.52,"date":"2026-07-26","moon_free_dark_hours":0.75,"moon_illumination":93,"moon_separation":118.7,"score":70,"score_astronomy":79,"score_weather":89,"transit_alt":79.1,"transit_local":"06:35","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":2.92,"best_label":"good","best_window":"01:25\u201304:20","dark_hours":5.58,"date":"2026-07-27","moon_free_dark_hours":0.0,"moon_illumination":97,"moon_separation":107.2,"score":65,"score_astronomy":66,"score_weather":99,"transit_alt":79.1,"transit_local":"06:35","verdict":"marginal","weather_source":"history","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"02:05\u201304:20","dark_hours":5.63,"date":"2026-07-28","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":95.6,"score":50,"score_astronomy":57,"score_weather":88,"transit_alt":79.1,"transit_local":"06:30","verdict":"marginal","weather_source":"history","weekday":"Tue"},{"best_hours":2.0,"best_label":"good","best_window":"02:20\u201304:20","dark_hours":5.68,"date":"2026-07-29","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":83.8,"score":47,"score_astronomy":47,"score_weather":100,"transit_alt":79.1,"transit_local":"06:25","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":0.75,"best_label":"good","best_window":"03:35\u201304:20","dark_hours":5.74,"date":"2026-07-30","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":71.8,"score":37,"score_astronomy":37,"score_weather":100,"transit_alt":79.1,"transit_local":"06:20","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":3.83,"best_label":"marginal","best_window":"00:35\u201304:25","dark_hours":5.79,"date":"2026-07-31","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":59.7,"score":30,"score_astronomy":30,"score_weather":100,"transit_alt":79.1,"transit_local":"06:15","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":3.83,"best_label":"marginal","best_window":"00:35\u201304:25","dark_hours":5.85,"date":"2026-08-01","moon_free_dark_hours":0.0,"moon_illumination":89,"moon_separation":47.6,"score":24,"score_astronomy":24,"score_weather":100,"transit_alt":79.1,"transit_local":"06:15","verdict":"poor","weather_source":"history","weekday":"Sat"},{"best_hours":3.83,"best_label":"marginal","best_window":"00:35\u201304:25","dark_hours":5.9,"date":"2026-08-02","moon_free_dark_hours":0.0,"moon_illumination":82,"moon_separation":35.6,"score":22,"score_astronomy":22,"score_weather":100,"transit_alt":79.1,"transit_local":"06:10","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":4.17,"best_label":"marginal","best_window":"00:20\u201304:30","dark_hours":5.96,"date":"2026-08-03","moon_free_dark_hours":0.32,"moon_illumination":73,"moon_separation":24.3,"score":26,"score_astronomy":26,"score_weather":100,"transit_alt":79.1,"transit_local":"06:05","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":4.25,"best_label":"marginal","best_window":"00:15\u201304:30","dark_hours":6.01,"date":"2026-08-04","moon_free_dark_hours":0.75,"moon_illumination":63,"moon_separation":15.9,"score":34,"score_astronomy":35,"score_weather":98,"transit_alt":79.1,"transit_local":"06:00","verdict":"poor","weather_source":"history","weekday":"Tue"},{"best_hours":1.75,"best_label":"good","best_window":"02:45\u201304:30","dark_hours":6.07,"date":"2026-08-05","moon_free_dark_hours":1.23,"moon_illumination":52,"moon_separation":16.4,"score":46,"score_astronomy":48,"score_weather":95,"transit_alt":79.1,"transit_local":"06:00","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":2.58,"best_label":"good","best_window":"02:00\u201304:35","dark_hours":6.13,"date":"2026-08-06","moon_free_dark_hours":1.87,"moon_illumination":40,"moon_separation":25.8,"score":58,"score_astronomy":64,"score_weather":91,"transit_alt":79.1,"transit_local":"05:55","verdict":"marginal","weather_source":"history","weekday":"Thu"},{"best_hours":4.17,"best_label":"good","best_window":"00:25\u201304:35","dark_hours":6.18,"date":"2026-08-07","moon_free_dark_hours":2.67,"moon_illumination":30,"moon_separation":38.3,"score":82,"score_astronomy":83,"score_weather":99,"transit_alt":79.1,"transit_local":"05:50","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":1.0,"best_label":"good","best_window":"02:00\u201303:00","dark_hours":6.24,"date":"2026-08-08","moon_free_dark_hours":3.67,"moon_illumination":19,"moon_separation":51.8,"score":65,"score_astronomy":92,"score_weather":71,"transit_alt":79.1,"transit_local":"05:45","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":4.33,"best_label":"good","best_window":"00:20\u201304:40","dark_hours":6.3,"date":"2026-08-09","moon_free_dark_hours":4.88,"moon_illumination":11,"moon_separation":65.8,"score":94,"score_astronomy":98,"score_weather":96,"transit_alt":79.1,"transit_local":"05:40","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":4.5,"best_label":"good","best_window":"00:10\u201304:40","dark_hours":6.35,"date":"2026-08-10","moon_free_dark_hours":6.22,"moon_illumination":5,"moon_separation":80.0,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"05:40","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":4.58,"best_label":"good","best_window":"00:05\u201304:40","dark_hours":6.41,"date":"2026-08-11","moon_free_dark_hours":6.38,"moon_illumination":1,"moon_separation":94.2,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"05:35","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":4.67,"best_label":"good","best_window":"00:05\u201304:45","dark_hours":6.47,"date":"2026-08-12","moon_free_dark_hours":6.45,"moon_illumination":0,"moon_separation":108.3,"score":98,"score_astronomy":100,"score_weather":98,"transit_alt":79.1,"transit_local":"05:30","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":1.5,"best_label":"marginal","best_window":"23:30\u201301:00","dark_hours":6.53,"date":"2026-08-13","moon_free_dark_hours":6.5,"moon_illumination":2,"moon_separation":122.0,"score":14,"score_astronomy":100,"score_weather":14,"transit_alt":79.1,"transit_local":"05:25","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.92,"best_label":"good","best_window":"00:05\u201301:00","dark_hours":6.58,"date":"2026-08-14","moon_free_dark_hours":6.57,"moon_illumination":6,"moon_separation":135.2,"score":59,"score_astronomy":100,"score_weather":59,"transit_alt":79.1,"transit_local":"05:20","verdict":"marginal","weather_source":"history","weekday":"Fri"},{"best_hours":4.92,"best_label":"good","best_window":"23:50\u201304:45","dark_hours":6.64,"date":"2026-08-15","moon_free_dark_hours":6.62,"moon_illumination":12,"moon_separation":147.5,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"05:20","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":5.08,"best_label":"good","best_window":"23:45\u201304:50","dark_hours":6.7,"date":"2026-08-16","moon_free_dark_hours":6.68,"moon_illumination":20,"moon_separation":158.3,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"05:15","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":5.08,"best_label":"good","best_window":"23:45\u201304:50","dark_hours":6.76,"date":"2026-08-17","moon_free_dark_hours":6.55,"moon_illumination":29,"moon_separation":165.0,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"05:10","verdict":"good","weather_source":"history","weekday":"Mon"},{"best_hours":2.0,"best_label":"good","best_window":"00:00\u201302:00","dark_hours":6.81,"date":"2026-08-18","moon_free_dark_hours":6.15,"moon_illumination":39,"moon_separation":162.9,"score":56,"score_astronomy":100,"score_weather":56,"transit_alt":79.1,"transit_local":"05:05","verdict":"marginal","weather_source":"history","weekday":"Tue"},{"best_hours":5.33,"best_label":"good","best_window":"23:35\u201304:55","dark_hours":6.87,"date":"2026-08-19","moon_free_dark_hours":5.68,"moon_illumination":48,"moon_separation":154.6,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"05:05","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":5.33,"best_label":"good","best_window":"23:35\u201304:55","dark_hours":6.93,"date":"2026-08-20","moon_free_dark_hours":5.12,"moon_illumination":58,"moon_separation":144.3,"score":99,"score_astronomy":100,"score_weather":99,"transit_alt":79.1,"transit_local":"05:00","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":5.33,"best_label":"good","best_window":"23:35\u201304:55","dark_hours":6.99,"date":"2026-08-21","moon_free_dark_hours":4.42,"moon_illumination":67,"moon_separation":133.4,"score":100,"score_astronomy":100,"score_weather":100,"transit_alt":79.1,"transit_local":"04:55","verdict":"good","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":"2026-07-23","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}}