{"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":22.71085365,"moon_separation":48.8,"name":"HD 189733","quality_hours":0.03,"ra":300.18213726,"resolved":{"dec":22.71085365,"name":"HD 189733","ra":300.18213726,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD%20189733","source":"sesame","spectral_type":"K2V","type":"BY*","type_text":"BY Draconis variable \u2014 a spotted, rotating star","vmag":7.648},"score":1,"score_astronomy":25,"score_weather":2,"transit":{"airmass":1.06,"alt":71.1,"az":178.9,"t":"2025-12-21T12:20Z"},"verdict":"poor","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":0.06,"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":"HD 189733","why":"Overcast (\u226580 % cloud) for 13.3 of 13.8 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}