Tusmørke er tiden mellem solnedgang og nat, og også mellem nat og solopgang, når solen er under horisonten, men atmosfæren er belyst af solen. Denne belysning effekt er et resultat af sollys bliver spredt af den øvre atmosfære.
Der er tre typer af tusmørke, defineret af, hvor langt solen er under horisonten.
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