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    Definition of the twilight intervals
    From: Robert H. van Gent
    Date: 2015 Aug 16, 11:18 +0000

    Hi, 
    
    There is a discussion at the moment at 
    
    https://en.wikipedia.org/wiki/Talk:Twilight#Article_contradicts_itself_on_twilight_definitions
    
    on the question whether civil, nautical and astronomical twilight are sequential 
    (i.e. non-overlapping) intervals as many internet sources claim or that they 
    are overlapping intervals (as is claimed in modern editions of Bowditch's 
    The American Practical Navigator.
    
    Any thoughts on this matter?
    
    Rob van Gent ("Astrolynx")
    
    

       
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