{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.36,"date":"2031-03-27","moon_free_dark_hours":5.37,"moon_illumination":22,"moon_separation":35.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.31,"date":"2031-03-28","moon_free_dark_hours":4.45,"moon_illumination":31,"moon_separation":46.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.26,"date":"2031-03-29","moon_free_dark_hours":3.62,"moon_illumination":40,"moon_separation":57.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.2,"date":"2031-03-30","moon_free_dark_hours":2.88,"moon_illumination":49,"moon_separation":68.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:25","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.15,"date":"2031-03-31","moon_free_dark_hours":2.22,"moon_illumination":59,"moon_separation":79.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:20","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.09,"date":"2031-04-01","moon_free_dark_hours":1.62,"moon_illumination":68,"moon_separation":91.2,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:20","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":8.04,"date":"2031-04-02","moon_free_dark_hours":1.07,"moon_illumination":76,"moon_separation":102.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:15","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.98,"date":"2031-04-03","moon_free_dark_hours":0.55,"moon_illumination":84,"moon_separation":114.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:10","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.93,"date":"2031-04-04","moon_free_dark_hours":0.03,"moon_illumination":91,"moon_separation":126.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:05","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.87,"date":"2031-04-05","moon_free_dark_hours":0.0,"moon_illumination":96,"moon_separation":138.5,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.82,"date":"2031-04-06","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":150.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"14:00","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.76,"date":"2031-04-07","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":159.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:55","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.7,"date":"2031-04-08","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":162.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:50","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.65,"date":"2031-04-09","moon_free_dark_hours":0.77,"moon_illumination":94,"moon_separation":156.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.59,"date":"2031-04-10","moon_free_dark_hours":1.87,"moon_illumination":87,"moon_separation":144.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:45","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.53,"date":"2031-04-11","moon_free_dark_hours":2.92,"moon_illumination":78,"moon_separation":132.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:40","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.48,"date":"2031-04-12","moon_free_dark_hours":3.83,"moon_illumination":68,"moon_separation":118.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:35","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.42,"date":"2031-04-13","moon_free_dark_hours":4.65,"moon_illumination":57,"moon_separation":105.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:30","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.36,"date":"2031-04-14","moon_free_dark_hours":5.32,"moon_illumination":46,"moon_separation":91.7,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.31,"date":"2031-04-15","moon_free_dark_hours":5.92,"moon_illumination":34,"moon_separation":78.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:25","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.25,"date":"2031-04-16","moon_free_dark_hours":6.43,"moon_illumination":24,"moon_separation":65.1,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:20","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.19,"date":"2031-04-17","moon_free_dark_hours":6.92,"moon_illumination":16,"moon_separation":52.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:15","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.13,"date":"2031-04-18","moon_free_dark_hours":7.12,"moon_illumination":8,"moon_separation":40.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:10","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.07,"date":"2031-04-19","moon_free_dark_hours":7.07,"moon_illumination":4,"moon_separation":28.8,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":7.02,"date":"2031-04-20","moon_free_dark_hours":7.0,"moon_illumination":1,"moon_separation":19.9,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:05","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.96,"date":"2031-04-21","moon_free_dark_hours":6.95,"moon_illumination":0,"moon_separation":17.3,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"13:00","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.9,"date":"2031-04-22","moon_free_dark_hours":6.88,"moon_illumination":2,"moon_separation":22.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"12:55","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.84,"date":"2031-04-23","moon_free_dark_hours":6.68,"moon_illumination":5,"moon_separation":32.0,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.78,"date":"2031-04-24","moon_free_dark_hours":5.73,"moon_illumination":10,"moon_separation":42.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"12:50","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.72,"date":"2031-04-25","moon_free_dark_hours":4.87,"moon_illumination":16,"moon_separation":53.6,"score":null,"score_astronomy":0,"score_weather":null,"transit_alt":79.1,"transit_local":"12:45","verdict":"unknown","weather_source":"none","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":"2031-03-27","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}}