On Wednesday, May 16, 2018, 1:43:03 AM PDT, Georgi Guninski
   <guninski@guninski.com> wrote:
   On Sat, May 12, 2018 at 05:44:32PM +0000, jim bell wrote:
   >  Piece of trivia:  The "Geographic pole" actually wanders a bit,
   probably mostly due to displacements of the mass of oceans and the
   atmosphere.I think it's on the order of about 100 meters or so.
   Presumably, this has to be accounted for in the calculations used by
   GPS receivers.https://en.wikipedia.org/wiki/True_polar_wander
   the north magnetic pole moves much, over 60 degrees E/W:
   [1]https://en.wikipedia.org/wiki/North_Magnetic_Pole
   "The North Magnetic Pole moves over time due to magnetic changes in the
   Earth's core.[1] In 2001, it was determined by the Geological Survey of
   Canada to lie west of Ellesmere Island in northern Canada at 81.3°N
   110.8°W. It was situated at 83.1°N 117.8°W in 2005. In 2009, while
   still
   situated within the Canadian Arctic
   territorial claim at 84.9°N 131.0°W,[2] it was moving toward Russia at
   between 55 and 60 kilometres (34 and 37 mi) per year.[3] As of 2017,
   the
   pole is projected to have moved beyond the Canadian Arctic territorial
   claim to 86.5°N 172.6°W"
   Keep in mind that I'm not referring to the movement of the Earth's
   magnetic pole. I'm talking about Earth's mechanical pole of rotation.
                    Jim Bell

References

   1. https://en.wikipedia.org/wiki/North_Magnetic_Pole