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    Re: twilight computer
    From: Robert Eno
    Date: 2009 May 29, 21:22 -0400

    I have been looking for one of these for 20 years. No luck so far. I know
    the man who helped to developed it and had the pleasure of handling the
    original prototype in 1990.
    
    The twilight computer is discussed in a publication called: "Arctic Air
    Navigation" by Cmdr. K.R. Greenaway.
    
    Attached, are some photos from the book.
    
    Robert
    
    ----- Original Message -----
    From: 
    To: 
    Sent: Friday, May 29, 2009 4:51 PM
    Subject: [NavList 8445] twilight computer
    
    
    >
    > Try google patent for this twilight computer:
    >
    > Patent number: 2633295
    >
    > Problem is in northern latitudes it is possible that a whole flight may be
    > in twilight, when neither sun nor stars can be observed.  Good to plan
    > around this.
    >
    > I've been looking for one of these.  Anyone got one?
    >
    >
    > >
    >
    
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