{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":6.31,"date":"2026-05-02","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":101.4,"score":0,"score_astronomy":54,"score_weather":0,"transit_alt":87.2,"transit_local":"07:35","verdict":"unusable","weather_source":"history","weekday":"Sat"},{"best_hours":2.5,"best_label":"good","best_window":"02:00\u201304:30","dark_hours":6.25,"date":"2026-05-03","moon_free_dark_hours":0.5,"moon_illumination":95,"moon_separation":95.1,"score":48,"score_astronomy":52,"score_weather":92,"transit_alt":87.2,"transit_local":"07:30","verdict":"marginal","weather_source":"history","weekday":"Sun"},{"best_hours":0.42,"best_label":"good","best_window":"04:00\u201304:25","dark_hours":6.19,"date":"2026-05-04","moon_free_dark_hours":1.45,"moon_illumination":91,"moon_separation":88.7,"score":19,"score_astronomy":50,"score_weather":38,"transit_alt":87.2,"transit_local":"07:30","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"01:35\u201304:25","dark_hours":6.13,"date":"2026-05-05","moon_free_dark_hours":2.28,"moon_illumination":84,"moon_separation":82.3,"score":50,"score_astronomy":50,"score_weather":100,"transit_alt":87.3,"transit_local":"07:25","verdict":"marginal","weather_source":"history","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"01:30\u201304:20","dark_hours":6.08,"date":"2026-05-06","moon_free_dark_hours":3.0,"moon_illumination":77,"moon_separation":76.1,"score":52,"score_astronomy":53,"score_weather":98,"transit_alt":87.3,"transit_local":"07:20","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":0.58,"best_label":"marginal","best_window":"00:25\u201301:00","dark_hours":6.02,"date":"2026-05-07","moon_free_dark_hours":3.58,"moon_illumination":69,"moon_separation":70.3,"score":6,"score_astronomy":62,"score_weather":9,"transit_alt":87.2,"transit_local":"07:15","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":2.0,"best_label":"marginal","best_window":"02:00\u201304:00","dark_hours":5.96,"date":"2026-05-08","moon_free_dark_hours":4.05,"moon_illumination":59,"moon_separation":65.2,"score":16,"score_astronomy":68,"score_weather":23,"transit_alt":87.2,"transit_local":"07:15","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":3.0,"best_label":"good","best_window":"01:00\u201304:00","dark_hours":5.91,"date":"2026-05-09","moon_free_dark_hours":4.45,"moon_illumination":50,"moon_separation":61.0,"score":61,"score_astronomy":74,"score_weather":82,"transit_alt":87.3,"transit_local":"07:10","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":1.0,"best_label":"good","best_window":"02:00\u201303:00","dark_hours":5.85,"date":"2026-05-10","moon_free_dark_hours":4.82,"moon_illumination":40,"moon_separation":58.1,"score":37,"score_astronomy":81,"score_weather":45,"transit_alt":87.3,"transit_local":"07:05","verdict":"poor","weather_source":"history","weekday":"Sun"},{"best_hours":0.33,"best_label":"marginal","best_window":"00:40\u201301:00","dark_hours":5.79,"date":"2026-05-11","moon_free_dark_hours":5.13,"moon_illumination":30,"moon_separation":56.9,"score":6,"score_astronomy":86,"score_weather":7,"transit_alt":87.3,"transit_local":"07:00","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":3.42,"best_label":"good","best_window":"00:45\u201304:10","dark_hours":5.74,"date":"2026-05-12","moon_free_dark_hours":5.47,"moon_illumination":20,"moon_separation":57.6,"score":87,"score_astronomy":91,"score_weather":96,"transit_alt":87.2,"transit_local":"06:55","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.68,"date":"2026-05-13","moon_free_dark_hours":5.67,"moon_illumination":12,"moon_separation":60.5,"score":0,"score_astronomy":95,"score_weather":0,"transit_alt":87.2,"transit_local":"06:55","verdict":"unusable","weather_source":"history","weekday":"Wed"},{"best_hours":1.42,"best_label":"good","best_window":"00:35\u201302:00","dark_hours":5.63,"date":"2026-05-14","moon_free_dark_hours":5.62,"moon_illumination":5,"moon_separation":65.3,"score":57,"score_astronomy":97,"score_weather":59,"transit_alt":87.3,"transit_local":"06:50","verdict":"marginal","weather_source":"history","weekday":"Thu"},{"best_hours":1.17,"best_label":"good","best_window":"00:50\u201302:00","dark_hours":5.58,"date":"2026-05-15","moon_free_dark_hours":5.57,"moon_illumination":1,"moon_separation":71.8,"score":55,"score_astronomy":97,"score_weather":57,"transit_alt":87.3,"transit_local":"06:45","verdict":"marginal","weather_source":"history","weekday":"Fri"},{"best_hours":3.08,"best_label":"good","best_window":"01:00\u201304:05","dark_hours":5.52,"date":"2026-05-16","moon_free_dark_hours":5.5,"moon_illumination":0,"moon_separation":79.4,"score":83,"score_astronomy":99,"score_weather":84,"transit_alt":87.2,"transit_local":"06:40","verdict":"good","weather_source":"history","weekday":"Sat"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.47,"date":"2026-05-17","moon_free_dark_hours":5.45,"moon_illumination":2,"moon_separation":87.5,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":87.2,"transit_local":"06:35","verdict":"unusable","weather_source":"history","weekday":"Sun"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.42,"date":"2026-05-18","moon_free_dark_hours":4.9,"moon_illumination":7,"moon_separation":95.8,"score":5,"score_astronomy":100,"score_weather":5,"transit_alt":87.2,"transit_local":"06:35","verdict":"poor","weather_source":"history","weekday":"Mon"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.37,"date":"2026-05-19","moon_free_dark_hours":3.88,"moon_illumination":14,"moon_separation":103.6,"score":0,"score_astronomy":100,"score_weather":0,"transit_alt":87.3,"transit_local":"06:30","verdict":"unusable","weather_source":"history","weekday":"Tue"},{"best_hours":0.75,"best_label":"good","best_window":"01:15\u201302:00","dark_hours":5.32,"date":"2026-05-20","moon_free_dark_hours":3.08,"moon_illumination":23,"moon_separation":110.6,"score":68,"score_astronomy":100,"score_weather":68,"transit_alt":87.3,"transit_local":"06:25","verdict":"marginal","weather_source":"history","weekday":"Wed"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.27,"date":"2026-05-21","moon_free_dark_hours":2.45,"moon_illumination":33,"moon_separation":116.4,"score":4,"score_astronomy":100,"score_weather":4,"transit_alt":87.2,"transit_local":"06:20","verdict":"poor","weather_source":"history","weekday":"Thu"},{"best_hours":0.0,"best_label":null,"best_window":null,"dark_hours":5.22,"date":"2026-05-22","moon_free_dark_hours":1.97,"moon_illumination":44,"moon_separation":120.6,"score":5,"score_astronomy":100,"score_weather":5,"transit_alt":87.2,"transit_local":"06:20","verdict":"poor","weather_source":"history","weekday":"Fri"},{"best_hours":1.0,"best_label":"good","best_window":"01:00\u201302:00","dark_hours":5.17,"date":"2026-05-23","moon_free_dark_hours":1.55,"moon_illumination":55,"moon_separation":122.8,"score":45,"score_astronomy":100,"score_weather":45,"transit_alt":87.3,"transit_local":"06:15","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":2.92,"best_label":"good","best_window":"01:00\u201303:55","dark_hours":5.13,"date":"2026-05-24","moon_free_dark_hours":1.18,"moon_illumination":65,"moon_separation":123.2,"score":85,"score_astronomy":100,"score_weather":85,"transit_alt":87.3,"transit_local":"06:10","verdict":"good","weather_source":"history","weekday":"Sun"},{"best_hours":0.42,"best_label":"good","best_window":"02:35\u201303:00","dark_hours":5.08,"date":"2026-05-25","moon_free_dark_hours":0.83,"moon_illumination":74,"moon_separation":121.6,"score":43,"score_astronomy":100,"score_weather":43,"transit_alt":87.3,"transit_local":"06:05","verdict":"marginal","weather_source":"history","weekday":"Mon"},{"best_hours":2.75,"best_label":"good","best_window":"00:15\u201303:00","dark_hours":5.04,"date":"2026-05-26","moon_free_dark_hours":0.48,"moon_illumination":83,"moon_separation":118.5,"score":80,"score_astronomy":100,"score_weather":80,"transit_alt":87.2,"transit_local":"06:00","verdict":"good","weather_source":"history","weekday":"Tue"},{"best_hours":0.83,"best_label":"good","best_window":"03:00\u201303:50","dark_hours":4.99,"date":"2026-05-27","moon_free_dark_hours":0.08,"moon_illumination":89,"moon_separation":114.2,"score":77,"score_astronomy":100,"score_weather":77,"transit_alt":87.2,"transit_local":"06:00","verdict":"good","weather_source":"history","weekday":"Wed"},{"best_hours":3.83,"best_label":"good","best_window":"00:00\u201303:50","dark_hours":4.95,"date":"2026-05-28","moon_free_dark_hours":0.0,"moon_illumination":94,"moon_separation":108.9,"score":85,"score_astronomy":86,"score_weather":99,"transit_alt":87.3,"transit_local":"05:55","verdict":"good","weather_source":"history","weekday":"Thu"},{"best_hours":2.83,"best_label":"good","best_window":"01:00\u201303:50","dark_hours":4.91,"date":"2026-05-29","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":103.0,"score":72,"score_astronomy":79,"score_weather":92,"transit_alt":87.3,"transit_local":"05:50","verdict":"good","weather_source":"history","weekday":"Fri"},{"best_hours":1.75,"best_label":"good","best_window":"02:00\u201303:45","dark_hours":4.87,"date":"2026-05-30","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":96.7,"score":48,"score_astronomy":73,"score_weather":65,"transit_alt":87.2,"transit_local":"05:45","verdict":"marginal","weather_source":"history","weekday":"Sat"},{"best_hours":3.17,"best_label":"good","best_window":"00:35\u201303:45","dark_hours":4.83,"date":"2026-05-31","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":90.3,"score":65,"score_astronomy":68,"score_weather":96,"transit_alt":87.2,"transit_local":"05:40","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":"2026-05-02","target":{"common_name":"North America Nebula","dec":44.33,"name":"NGC 7000","ra":314.69583333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=NGC%207000","source":"sesame","type":"Cl*","type_text":"star cluster"}}