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    Re: Position from a Clock with Photo Diode
    From: Frank Reed CT
    Date: 2005 Jun 6, 23:00 EDT

    Brooke C you wrote:
    "Suppose that a clock  that keeps UTC time to within 1 second has a photo
    sensor with an analog  output to a computer.  The clock is indoors but
    the room has a window to  the outside so although the clock is in the
    shadow of the Sun it does see a  daily brightness curve.
    How accurately can the clock determine where it is in  the world?"
    This exists.
    In fish tags!! I've posted on this before.  Here's something I wrote
    >>This technique of navigation is  actively employed on a small device that
    operates in an area inaccessible to GPS  signals --underwater. Do you have
    $4200 to spare? Then you, too, can be the  proud honor of a celestial navigating
    fish tag. I brought this up briefly on the  list over a year ago. Here's a link
    to their web site and a description of the  device:
    They get  one-degree-ish estimated accuracy in latitude and longitude by
    timing sunrise  and sunset (based on light levels corrected for depth, which is
    measured by  pressure). <<
    42.0N 87.7W, or 41.4N  72.1W.

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