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    Re: Green Flash and Longitude
    From: Doug Royer
    Date: 2006 Jan 5, 15:54 -0800

    Frank wrote:
    Yeah, I agree. There's nothing  navigationally significant about the green
    flash, that I can think of, that  would make it any different from any other
    sunset. It's an attractive phenomenon  regardless. By the way, I, too, have
    "seen" the green flash, but like you I have  to wonder whether there was
    some
    wishful thinking involved since it was over so  quickly. There's no doubt
    that it's
    a real phenomenon --it can be photographed  and video-ed-- but it's not
    exactly an obvious thing.
    
    If someone waited on witnessing a green flash to get an LOP they're going to
    be bobbing around out there for a long time (many, many sunsets) before they
    get the chance. Unless the observer is very lucky indeed.
    Perhaps what was meant was if the observer is ready and everything is set up
    a local time shot may be taken with a stop watch to figure out a longitude.
    I just don't know what the writer was trying to get across with this. I
    can't, for the life of me, understand how this event, when witnessed, would
    be navigationally superior to any other sunset observation. Perhaps Mr.
    Stark can shed some light on what he was trying to relate.
    
    And as Joel stated in his witnessing of some, the flash is not confined to
    the immediate area around the Sun but, in reality, covers quite a big area
    of the western horizon.
    
    I don't know what causes this event other than anecdotal and eyewitness
    evidence that it does happen.
    One evening the on duty deck crew were all looking for the green flash. The
    lookouts on the forward quarter and bow (deck level) stated they saw it but
    everyone on the upper decks didn't see anything other than a nice sunset.
    
    I often wondered if this event ever happens over terra firma.
    
    
    

       
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