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Another web site with info re polarized sky compass:

http://www.time.com/time/magazine/article/0,9171,935539,00.html

Gary LaPook

On Feb 20, 12:07 am, Nicol�s de Hilster  wrote:
> Thanks Gary and Frank,
>
> very useful links. Calibration down to one degree sounds good enough to
> me for navigational purposes (plenty gyro compasses do not achieve this,
> you will need a fibre-optic one for better results). The Shetland
> Islands (due west from Bergen) were frequented by the Vikings in the
> past, which takes two days sailing. I always wondered how they managed
> to sail due west for two days to get there. The Sun-Stone can very well
> explain how they did this.
>
> Nicol�s
>
> glap...@PACBELL.NET wrote:
> >Try these links.
>
> >http://www.gi.alaska.edu/ScienceForum/ASF8/865.html
> >http://www.navigationfoundation.org/AdmDavies.htm
> >http://www.polarization.com/compass/compass.html
> >http://www.polarization.com/viking/viking.html


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