{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2025-05-23","schedule":[{"end":"2025-05-24T02:55Z","end_local":"05:55","hours":9.25,"mean_quality":0.0,"start":"2025-05-23T17:40Z","start_local":"20:40","target":null}],"targets":[{"best_window":null,"dec":2.05238823,"moon_separation":166.1,"name":"3C 273","quality_hours":0.18,"ra":187.27791594,"resolved":{"dec":2.05238823,"morphology":"E3","name":"3C 273","ra":187.27791594,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=3C%20273","source":"sesame","type":"BLL","type_text":"BL Lac object \u2014 a blazar","vmag":14.83},"score":4,"score_astronomy":71,"score_weather":6,"transit":{"airmass":1.3,"alt":50.2,"az":180.0,"t":"2025-05-23T18:45Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2025-05-23T20:00Z","end_local":"23:00","hours":2.33,"label":"unusable","mean_quality":0.0,"start":"2025-05-23T17:40Z","start_local":"20:40"},{"end":"2025-05-23T21:00Z","end_local":"00:00","hours":1.0,"label":"poor","mean_quality":0.18,"start":"2025-05-23T20:00Z","start_local":"23:00"},{"end":"2025-05-24T02:55Z","end_local":"05:55","hours":5.92,"label":"unusable","mean_quality":0.0,"start":"2025-05-23T21:00Z","start_local":"00:00"}]}],"unscheduled":[{"name":"3C 273","why":"Overcast (\u226580 % cloud) for 6.2 of 8.2 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}