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    Re: Latitude of prime vertical sight
    From: Paul Lee
    Date: 2007 Jul 31, 03:44 -0700

    Hi Frank,
    The local sunrise had been determined in retrospect by an astronomical
    The prime vertical sight would be taken about this time.
    Best wishes
    On 31 Jul, 00:31, Frank Reed  wrote:
    > Hi Paul. You wrote:
    > "I'm new to navigation, and am doing some work on the usage of prime
    > vertical sights. I know it gives longitude, but if you knew the time
    > of sunrise, is it possible to obtain a value for lattitude too? "
    > Welcome aboard. I'm not entirely sure what you're asking here. Are you
    > saying that we've recorded the local time of sunrise? Perhaps at
    > sunrise we look at a watch and note that the time is 0701 and later
    > when we take the time sight the time is 0914. With that difference in
    > time and the measured altitude for the time sight, you could
    > presumably calculate the latitude. Is that what you have in mind?
    > -FER
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