{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2026-05-18","schedule":[{"end":"2026-05-19T03:00Z","end_local":"06:00","hours":9.42,"mean_quality":0.0,"start":"2026-05-18T17:35Z","start_local":"20:35","target":null}],"targets":[{"best_window":null,"dec":41.26875,"moon_separation":62.5,"name":"M31","quality_hours":0.03,"ra":10.68470833,"resolved":{"common_name":"Andromeda Galaxy","dec":41.26875,"morphology":"SA(s)b","name":"M 31","ra":10.68470833,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M31","source":"sesame","type":"AGN","type_text":"galaxy with an active nucleus","vmag":3.44},"score":0,"score_astronomy":6,"score_weather":6,"transit":{"airmass":1.0,"alt":89.5,"az":122.6,"t":"2026-05-19T07:15Z"},"verdict":"unusable","weather_known":true,"windows":[{"end":"2026-05-19T00:40Z","end_local":"03:40","hours":7.08,"label":"unusable","mean_quality":0.0,"start":"2026-05-18T17:35Z","start_local":"20:35"},{"end":"2026-05-19T01:00Z","end_local":"04:00","hours":0.33,"label":"poor","mean_quality":0.09,"start":"2026-05-19T00:40Z","start_local":"03:40"},{"end":"2026-05-19T03:00Z","end_local":"06:00","hours":2.0,"label":"unusable","mean_quality":0.0,"start":"2026-05-19T01:00Z","start_local":"04:00"}]}],"unscheduled":[{"name":"M31","why":"Overcast (\u226580 % cloud) for 6.5 of 8.3 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}