Next message: Brooke Clarke: "Re: Position from a Clock with Photo Diode"
> 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.
