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    Re: Position from a Clock with Photo Diode
    From: Peter Fogg
    Date: 2005 Jun 7, 08:00 +1000

    > From: Brooke Clarke
    > 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?
    It will have a hard time working out its longitude.
    As to latitude, presuming the variance due to weather can de discounted,
    could the question be reformulated as: how accurately can the principle of
    an annalemma be used for determining latitude?
    Or another variation, could the times of sunrise and sunset be used over a
    period to determine latitude?
    As you may have noticed, these aren't so much answers as more questions. The
    general idea sounds plausible.

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