{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2025-12-20","schedule":[{"end":"2025-12-20T16:00Z","end_local":"18:00","hours":1.17,"mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50","target":null},{"end":"2025-12-20T16:35Z","end_local":"18:35","hours":0.58,"mean_quality":0.46,"start":"2025-12-20T16:00Z","start_local":"18:00","target":"M31"},{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"mean_quality":0.91,"start":"2025-12-20T16:35Z","start_local":"18:35","target":"M33"},{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":12.75,"mean_quality":0.0,"start":"2025-12-20T17:00Z","start_local":"19:00","target":null}],"targets":[{"best_window":{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.91,"start":"2025-12-20T16:35Z","start_local":"18:35"},"dec":41.26875,"moon_separation":108.4,"name":"M31","quality_hours":0.72,"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":10,"score_astronomy":100,"score_weather":10,"transit":{"airmass":1.0,"alt":89.5,"az":125.9,"t":"2025-12-20T17:05Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2025-12-20T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50"},{"end":"2025-12-20T16:00Z","end_local":"18:00","hours":0.58,"label":"poor","mean_quality":0.13,"start":"2025-12-20T15:25Z","start_local":"17:25"},{"end":"2025-12-20T16:35Z","end_local":"18:35","hours":0.58,"label":"marginal","mean_quality":0.46,"start":"2025-12-20T16:00Z","start_local":"18:00"},{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.91,"start":"2025-12-20T16:35Z","start_local":"18:35"},{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":12.75,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T17:00Z","start_local":"19:00"}]},{"best_window":null,"dec":-5.3876,"moon_separation":143.5,"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":89,"score_weather":0,"transit":{"airmass":1.47,"alt":42.9,"az":180.5,"t":"2025-12-20T22:00Z"},"verdict":"unusable","weather_known":true,"windows":[{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":14.92,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50"}]},{"best_window":{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.81,"start":"2025-12-20T16:35Z","start_local":"18:35"},"dec":24.11388889,"moon_separation":141.1,"name":"M45","quality_hours":0.63,"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":7,"score_astronomy":100,"score_weather":7,"transit":{"airmass":1.05,"alt":72.5,"az":179.7,"t":"2025-12-20T20:10Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2025-12-20T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50"},{"end":"2025-12-20T16:00Z","end_local":"18:00","hours":0.58,"label":"poor","mean_quality":0.1,"start":"2025-12-20T15:25Z","start_local":"17:25"},{"end":"2025-12-20T16:35Z","end_local":"18:35","hours":0.58,"label":"marginal","mean_quality":0.39,"start":"2025-12-20T16:00Z","start_local":"18:00"},{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.81,"start":"2025-12-20T16:35Z","start_local":"18:35"},{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":12.75,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T17:00Z","start_local":"19:00"}]},{"best_window":{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.87,"start":"2025-12-20T16:35Z","start_local":"18:35"},"dec":44.33,"moon_separation":78.7,"name":"NGC 7000","quality_hours":0.7,"ra":314.69583333,"resolved":{"common_name":"North America Nebula","dec":44.33,"name":"NGC 7000","ra":314.69583333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=NGC%207000","source":"sesame","type":"Cl*","type_text":"star cluster"},"score":17,"score_astronomy":81,"score_weather":21,"transit":{"airmass":1.0,"alt":87.2,"az":353.4,"t":"2025-12-20T13:25Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2025-12-20T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50"},{"end":"2025-12-20T16:00Z","end_local":"18:00","hours":0.58,"label":"poor","mean_quality":0.13,"start":"2025-12-20T15:25Z","start_local":"17:25"},{"end":"2025-12-20T16:35Z","end_local":"18:35","hours":0.58,"label":"marginal","mean_quality":0.45,"start":"2025-12-20T16:00Z","start_local":"18:00"},{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.87,"start":"2025-12-20T16:35Z","start_local":"18:35"},{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":12.75,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T17:00Z","start_local":"19:00"}]},{"best_window":{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.87,"start":"2025-12-20T16:35Z","start_local":"18:35"},"dec":44.25788576,"moon_separation":78.6,"name":"V1057 Cyg","quality_hours":0.7,"ra":314.72388973,"resolved":{"dec":44.25788576,"name":"EM* LkHA 190","ra":314.72388973,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=V1057%20Cyg","source":"sesame","spectral_type":"F7/G3I/IIe","type":"Or*","type_text":"Orion-type variable \u2014 a young, erupting star","vmag":12.33},"score":17,"score_astronomy":81,"score_weather":21,"transit":{"airmass":1.0,"alt":87.3,"az":353.6,"t":"2025-12-20T13:25Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2025-12-20T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50"},{"end":"2025-12-20T16:00Z","end_local":"18:00","hours":0.58,"label":"poor","mean_quality":0.13,"start":"2025-12-20T15:25Z","start_local":"17:25"},{"end":"2025-12-20T16:35Z","end_local":"18:35","hours":0.58,"label":"marginal","mean_quality":0.45,"start":"2025-12-20T16:00Z","start_local":"18:00"},{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.87,"start":"2025-12-20T16:35Z","start_local":"18:35"},{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":12.75,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T17:00Z","start_local":"19:00"}]},{"best_window":{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.91,"start":"2025-12-20T16:35Z","start_local":"18:35"},"dec":30.66017511,"moon_separation":114.5,"name":"M33","quality_hours":0.72,"ra":23.46206906,"resolved":{"common_name":"Triangulum Pinwheel","dec":30.66017511,"morphology":"SA(s)cd","name":"M 33","ra":23.46206906,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M33","source":"sesame","type":"GiG","type_text":"galaxy in a group","vmag":5.72},"score":10,"score_astronomy":100,"score_weather":10,"transit":{"airmass":1.02,"alt":79.1,"az":182.2,"t":"2025-12-20T18:00Z"},"verdict":"poor","weather_known":true,"windows":[{"end":"2025-12-20T15:25Z","end_local":"17:25","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T14:50Z","start_local":"16:50"},{"end":"2025-12-20T16:00Z","end_local":"18:00","hours":0.58,"label":"poor","mean_quality":0.13,"start":"2025-12-20T15:25Z","start_local":"17:25"},{"end":"2025-12-20T16:35Z","end_local":"18:35","hours":0.58,"label":"marginal","mean_quality":0.46,"start":"2025-12-20T16:00Z","start_local":"18:00"},{"end":"2025-12-20T17:00Z","end_local":"19:00","hours":0.42,"label":"good","mean_quality":0.91,"start":"2025-12-20T16:35Z","start_local":"18:35"},{"end":"2025-12-21T05:45Z","end_local":"07:45","hours":12.75,"label":"unusable","mean_quality":0.0,"start":"2025-12-20T17:00Z","start_local":"19:00"}]}],"unscheduled":[{"name":"M42","why":"Overcast (\u226580 % cloud) for 12.3 of 13.8 dark hours \u2014 the sky is closed whatever the geometry says."},{"name":"M45","why":"its best window (18:35\u201319:00) is outranked by M33"},{"name":"NGC 7000","why":"its best window (18:35\u201319:00) is outranked by M33"},{"name":"V1057 Cyg","why":"its best window (18:35\u201319:00) is outranked by M33"}],"warnings":[]}