{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2026-03-18","schedule":[{"end":"2026-03-19T04:30Z","end_local":"06:30","hours":12.0,"mean_quality":0.0,"start":"2026-03-18T16:30Z","start_local":"18:30","target":null}],"targets":[{"best_window":null,"dec":24.17805556,"moon_separation":63.0,"name":"M45","quality_hours":0.0,"ra":56.65833333,"resolved":{"common_name":"Seven Sisters","dec":24.17805556,"name":"Cl Melotte 22","ra":56.65833333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M45","source":"sesame","type":"OpC","type_text":"open cluster"},"score":0,"score_astronomy":38,"score_weather":0,"transit":{"airmass":1.05,"alt":72.6,"az":180.3,"t":"2026-03-18T14:25Z"},"verdict":"unusable","weather_known":true,"windows":[{"end":"2026-03-19T04:30Z","end_local":"06:30","hours":12.0,"label":"unusable","mean_quality":0.0,"start":"2026-03-18T16:30Z","start_local":"18:30"}]}],"unscheduled":[{"name":"M45","why":"Overcast (\u226580 % cloud) for 11.0 of 11.0 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}