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Twilight is the time before sunrise and after sunset when sunlight reflected from particles in the upper atmosphere illuminates the lower atmosphere and the surface of the earth.
(For these definitions, we use an ideal horizon 90 degrees from the zenith.) In high latitudes in summer the twilight may extend from sunset to sunrise. This phenomenon is known as white night. External links
ca:Crepuscle de:Dämmerung es:Crepúsculo it:Crepuscolo ja:薄明 fi:Hämärä
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