{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2025-12-21","schedule":[{"end":"2025-12-22T05:50Z","end_local":"07:50","hours":15.0,"mean_quality":0.0,"start":"2025-12-21T14:50Z","start_local":"16:50","target":null}],"targets":[{"best_window":null,"dec":24.11388889,"moon_separation":128.9,"name":"M45","quality_hours":0.03,"ra":56.60083333,"resolved":{"common_name":"Seven Sisters","dec":24.11388889,"name":"Cl Melotte 22","ra":56.60083333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M45","source":"sesame","type":"OpC","type_text":"open cluster"},"score":0,"score_astronomy":100,"score_weather":0,"transit":{"airmass":1.05,"alt":72.5,"az":178.9,"t":"2025-12-21T20:05Z"},"verdict":"unusable","weather_known":true,"windows":[{"end":"2025-12-21T15:30Z","end_local":"17:30","hours":0.67,"label":"unusable","mean_quality":0.0,"start":"2025-12-21T14:50Z","start_local":"16:50"},{"end":"2025-12-21T16:00Z","end_local":"18:00","hours":0.5,"label":"poor","mean_quality":0.05,"start":"2025-12-21T15:30Z","start_local":"17:30"},{"end":"2025-12-22T05:50Z","end_local":"07:50","hours":13.83,"label":"unusable","mean_quality":0.0,"start":"2025-12-21T16:00Z","start_local":"18:00"}]}],"unscheduled":[{"name":"M45","why":"Overcast (\u226580 % cloud) for 13.3 of 13.8 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}