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    Sunset, sunrise, civil & nautical twilight
    From: Dave Weilacher
    Date: 2002 Jan 30, 2:04 PM

    A definition I've read for these is:
    
    Sunset occurs right when the top of the sun disappears over the horizon.  
    Civil twilight occurs when the sun is 6 degrees below the horizon, and 
    nautical twilight occurs at 12 degrees.
    
    Sunset might make sense but the 6 and 12 degree notion doesn't seem right to me.
    
    The closer to a pole you are, the longer twilight lasts (yes or no?) in which 
    case the degrees don't work.
    
    Would someone be willing to clarify this for me?
    
    
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