{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2025-08-18","schedule":[{"end":"2025-08-19T03:35Z","end_local":"06:35","hours":10.33,"mean_quality":0.0,"start":"2025-08-18T17:15Z","start_local":"20:15","target":null}],"targets":[{"best_window":null,"dec":-5.3876,"moon_separation":34.9,"name":"M42","quality_hours":0.0,"ra":83.8201,"resolved":{"common_name":"Great Orion Nebula","dec":-5.3876,"name":"M 42","ra":83.8201,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M42","source":"sesame","type":"HII","type_text":"HII region \u2014 a star-forming nebula"},"score":0,"score_astronomy":0,"score_weather":5,"transit":{"airmass":1.47,"alt":42.9,"az":179.6,"t":"2025-08-19T06:05Z"},"verdict":"unusable","weather_known":true,"windows":[{"end":"2025-08-19T03:00Z","end_local":"06:00","hours":9.75,"label":"unusable","mean_quality":0.0,"start":"2025-08-18T17:15Z","start_local":"20:15"},{"end":"2025-08-19T03:05Z","end_local":"06:05","hours":0.08,"label":"poor","mean_quality":0.05,"start":"2025-08-19T03:00Z","start_local":"06:00"},{"end":"2025-08-19T03:35Z","end_local":"06:35","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2025-08-19T03:05Z","start_local":"06:05"}]}],"unscheduled":[{"name":"M42","why":"no usable window tonight"}],"warnings":[]}